Statistics, research

Research results from CERG

Read the results from our newest publications – and from publications where our researchers have contributed.


Exercise-based knowledge could lead to new heart failure drugs

Flyvende piller og cocktailglass

Exercise reprograms genes in the failing heart towards a healthier profile. We found 932 genes that were significantly affected by heart failure in rats that did not exercise. In exercised rats, only 174 genes differed in abundance compared to the healthy control group. Moreover, we identified nearly 50 genes that were differently expressed in exercised compared to not exercised rat hearts.

We chose 16 genes for further analysis. Many of them proved to be affected by heart failure also in humans, and we especially identified the enzyme proline dehydrogenase as an interesting target for future gene therapy. The expression of this enzyme is reduced in heart failure, but increases with exercise. When we silenced the gene in heart muscle cells from humans, the levels of the heart failure marker BNP doubled. On the other hand, when we stimulated to overexpression of proline dehydrogenase, processes that are important for energy production and metabolism increased significantly.

Read the full research article in Progress in Cardiovascular Diseases:
Exercise reveals proline dehydrogenase as a potential target in heart failure

Could exercise-induced factors in blood prevent and treat dementia?

Alzheimer's Disease puzzle illustration

Several studies indicate that physical activity and high cardiorespiratory fitness can protect against Alzheimer's disease and dementia in general. In this review we sum up the evidence, and also highlight some potential mechanisms explaining why exercise and high fitness could be protective.

Exercise reduces cardiovascular risk factors, such as obesity, hypertension and diabetes, all of which are also risk factors for dementia. However, exercise and high fitness could potentially also reduce dementia risk directly, by promoting the formation of new blood vessels and neurons in the brain, as well as preserving brain volume. The review highlights nine factors that are released into the bloodstream in response to physical activity and support growth, survival, and differentiation of neurons and blood vessels.

Read the full research article in Progress in Cardiovascular Diseases:
Are the Neuroprotective Effects of Exercise Training Systematically Mediated?

Higher fitness with 100 PAI

Personal Activity Intelligence and VO2max

Men and women with 100 weekly PAI or more have significantly higher cardiorespiratory fitness than those with less than 100 weekly PAI. Obtaining 100–150 weekly PAI seems to secure having the average cardiorespiratory fitness expected for your age and sex. PAI (Personal Activity Intelligence) is our new standard for activity tracking, and 100 weekly PAI is associated with better health and a longer life.

Read more about PAI

In this new article, we review the existing evidence on PAI, and supplement them with new analyzes linking gradually increasing PAI scores to higher cardiorespiratory fitness in more than 3,000 healthy men and women who performed a direct test of maximum oxygen uptake. The findings suggest that PAI could be a useful tool to motivate people to become sufficiently physically active to improve their health.

Read the full research article in Progress in Cardiovascular Diseases:
Personal activity intelligence (PAI): A new standard in activity tracking for obtaining a healthy cardiorespiratory fitness level and low cardiovascular risk

Strong link between poor fitness and non-alcoholic fatty liver disease

Ikke-alkoholisk fettlever

We found that the 20 % with the lowest cardiorespiratory fitness had 17 times higher likelihood of having non-alcoholic fatty liver disease compared to the 40 % with the highest fitness, even among individuals who sat less than four hours a day. Furthermore, among the 36 % who had non-alcoholic fatty liver disease in our cohort, the risk of dying within the next nine years was 50 % higher in those with low fitness.

Our results also show that cardiorespiratory fitness is much stronger linked to non-alcoholic fatty liver disease than sedentary time and adhering to official physical activity recommendations. The study includes 16,000 men and women who participated in the Nord-Trøndelag Health Study (HUNT) between 2006 and 2008.

Read the full article in Progress in Cardiovascular Disease:
Non-alcoholic fatty liver disease: prevalence and all-cause mortality according to sedentary behaviour and cardiorespiratory fitness. The HUNT Study

Skiers don't reach high oxygen uptake during double poling

Langrennsløype i solskinn

Cross-country skiers should not do isolated upper-body work like double poling to improve their cardiorespiratory fitness. We have shown that the peak heart rate and O2 pulse during intensive seated double poling is too low to tax the cardiovascular system sufficiently. The peak oxygen uptake during double poling was far lower than during running and diagonal skiing, whereas the blood lactic acid concentration at a given heart rate was higher. 

12 male elite cross-country skiers performed three sessions with different modes of exercise at gradually increasing intensities, followed by a test to exhaustion. The power output during high-intensity seated upper-body double poling was not high enough to have a likely effect on fitness. The results indicate that it's not the heart that limits exercise performance during maximal upper-body work, but rather local muscular fatigue.

Read the full resarch article in The Journal of Strenght and Conditioning Research:
Comparison of Physiological and Perceptual Responses to Upper-, Lower-, and Whole-Body Exercise in Elite Cross-Country Skiers

More people respond to high-intensity interval training

High-intensity interval training

High-volume high-intensity interval training is more likely to improve cardiorespiratory fitness than continuous exercise at moderate intensity. One third of those who performed regular interval training with at least 15 minutes of high intensity per session increased their fitness, even when we used strict criteria to define a likely response. In comparison, one fifth of those who exercised at moderate intensity for at least 30 minutes per session were responders.

The article includes data from 18 trials and 677 participants from five countries. We have included studies with healthy adults of all ages, as well as higher risk populations and patients with coronary heart disease. A gain of at least 5 ml/kg/min was defined as response to exercise. The studies with the longest duration and highest exercise loads had the most significant number of responders, indicating that at least some of those who were deemed non-responders would respond with an increase in training duration, frequency or intensity.

Read the full article in Frontiers in Physiology:
A Multi-Center Comparison of VO2peak Trainability Between Interval Training and Moderate Intensity Continuous Training

Could our lungs limit our aerobic capacity?

Kvinne som gjennomfører spirometri

Lung function could be important for the physical capacity even in healthy adults. We studied the association between forced expiratory lung volume in one second (FEV1) and maximum oxygen uptake in 741 individuals aged 20 to 79 years, and found a linear relationship between better lung function and higher fitness in men, women, young, elderly and non-smokers.

Everyone included in the study had a lung function within the normal limits. Dynamic lung volume is not considered a limiting factor of oxygen uptake in healthy persons, and most of our participants had preserved ventilatory reserve at the end of their peak fitness test. Even so, our results suggest that lung function affects maximum oxygen uptake, and the potential mechanisms need to be studied further in the future.

Read the full research article in BMC Pulmonary Medicine:
The association between dynamic lung volume and peak oxygen uptake in a healthy general population: the HUNT study


Studies published in 2018


How can high fitness protect against metabolic diseases?

Rotte i snøen

Rats born with high aerobic capacity have more oxidized proteins in skeletal muscle. Many of these oxidized proteins are important regulators of the oxidative metabolism, including some essential metabolic enzymes. The findings bring novel insight into some of the processes that might explain the beneficial effects of high cardiorespiratory fitness on metabolism.

We have used mass-spectrometry-based proteomic analysis to compare oxidative post-translational modifications of proteins in rats bred for high and low aerobic capacity. The article is a result of the UTFORSK partnership between CERG and the University of Sao Paulo, Brazil.


High fitness is linked to increased skeletal muscle metabolism

Gnager som sigger sammenkrøket

Two weekly sessions of high-intensity interval training over a long period have marginal impact on leg muscle metabolism in rats. The reason might be that the exercise volume is too low to increase fitness. Rats born with high aerobic capacity had a more favorable metabolic profile than rats born with low aerobic capacity, and ageing also affected the metabolism negatively.

The study includes rats that have been bred to either low or high cardiorespiratory fitness for 30 generations. Rats from both fitness groups were randomly selected to exercise or no exercise, and we measured both fitness and skeletal muscle metabolism after three and eleven months of exercise. High inborn fitness associated with higher levels of glutamine and glutamate and lower levels of lactate, indicating more effective glucose oxidation and higher energy metabolism.


Cardiorespiratory fitness reveals risk of heart attack in healthy persons

Even if you have no symptoms of a life-style disease today, low cardiorespiratory fitness could be a warning sign of a future heart attack. We found a strong link between higher fitness and reduced risk of a coronary event during the next nine years in a very healthy sample of adults.

The results are based on a gold-standard maximal exercise test of peak oxygen uptake in 4,527 men and women. None of them had previous cardiovascular or lung disease, cancer or hypertension, and most were considered to have a low ten-year risk of cardiovascular disease. Even so, 147 participants had a heart attack or were diagnosed with angina pectoris by 2017. The 25 % who measured the highest fitness levels had half the risk compared to those with the lowest fitness levels.

Read the full research article in European Heart Journal:
Peak oxygen uptake and incident coronary heart disease in a healthy population – The HUNT Fitness Study


Higher maximum heart rate with lower fitness

Svett mann løper

Healthy non-athletes almost reach their true maximum heart rate during an all-out test of maximum oxygen uptake. In our research, we usually add five heart beats to the highest heart rate achieved during a cardiopulmonary exercise test, but according to our new results that is three beats too many. The study also indicates that women and men have similar maximum heart rates, and that persons with below-average fitness generally have higher maximum heart rates than fitter persons.

The study includes 107 men and women between 22 and 70 years of age. They all had their maximum oxygen uptake tested at our lab, and then performed a standardized maximum heart rate test a few days later. The results show that the real maximum heart rate was 2.2 beats higher per minute than the maximum heart rate achieved during the test of oxygen uptake.

Read the full research article in Journal of Science and Medicine in Sport:
The relationship between maximum heart rate in a cardiorespiratory fitness test and in a maximum heart rate test


Stroke patients adhere to exercise habits with long-term coaching

Illsutrasjon av kvinne med stokk som støttes av helsepersonell

Patients with stroke who receive individualized coaching over time maintain good adherence to regular physical activity and exercise. The study includes patients with mild or moderate impairements after stroke, and the results indicate that coaching and motivational interviewing help keep the patients active for at least one and a half year.

Once a month, each of the 186 stroke patients in the study were encouraged by a physical therapist to be physically active for at least 30 minutes every day, and to perform at least 45 minutes of more structured exercise each week. More than half achieved the recommended amount of activity each month, but the intensity was generally lower than advised. The study was mainly conducted by researcher at the Geriatrics, Movement and Stroke research group at NTNU.

Read the full research article in Physical Therapy:
Adherence to a Long-Term Physical Activity and Exercise Program After Stroke Applied in a Randomized Controlled Trial


High intensity interval training is effective in psoriasis arthritis

Spinningsykler

Eleven weeks of 4x4 interval training on a stationary bicycle improved cardiopulmonary fitness substantially in patients with the rheumatic disease psoriasis arthritis. The participants randomized to exercise also reduced their abdominal fat more than those told not to change their activity habits.

The patients were followed up again six months after the end of the organized exercise sessions, and the increase in fitness was maintained in the exercise group. A total of 61 persons participated in the study. Psoriasis arthritis is a chronic inflammatory disease, and patients are at increased risk of cardiovascular disease.

Read the full research article in RMD Open:
Effect of high-intensity interval training on cardiovascular disease risk factors and body composition in psoriatic arthritis: a randomised controlled trial


Future dementia is linked to inactivity and poor mental health

Dementia puzzle

The combination of low physical activity and many symptoms on anxiety and depression at mid-life seems to increase the risk of dementia. For instance, physically active middle-aged persons without psychological distress had 37 % reduced risk of developing dementia compared to inactive persons with high psychological distress.

We followed nearly 29,000 individuals between 30 and 60 years of age from the first HUNT Study in the middle of the 1980s. Those who reported to exercise with moderate intensity or higher at least once a week had substantially reduced risk of being diagnosed with dementia between 1995 and 2011. This was true for participants with few symptoms of anxiety and depression, and for participants with many symptoms.

Read the full research article in Journal of Alzheimer's Disease::
Midlife physical activity, psychological distress, and dementia risk: The HUNT Study


Gained more PAI and lived longer

Even if you exercise too little to achieve 100 weekly PAI, it's not too late to start now. We looked at how increasing the PAI score over time affected mortality, and found that those who increased from less than 100 PAI a week in the first survey up to at least 100 PAI a week in the next survey eleven years later had lower risk of dying early. In fact, they gained more than six years compared to those who stayed below 100 PAI over time. The benefits of an increased PAI score was especially high in those who had less than 50 weekly PAI at the first survey.

Read more about PAI (Personal Activity Intelligence)

The lowest risk was found in those who were physically active enough to reach 100 PAI or more at both surveys. These participants gained more than eight years, and both the risk of dying early from any cause and from cardiovascular disease was substantially reduced. The study includes almost 25,000 participants who attended both the HUNT1 and HUNT2 surveys in the mid-1980s and mid-1990s. Almost 5000 of them died during the follow-up period until 2015.

Read the full research article in Mayo Clinic Proceedings:
Temporal Changes in a Novel Metric of Physical Activity Tracking (Personal Activity Intelligence) and Mortality: The HUNT Study, Norway


Outdoor walking is popular among older adults

More than half of the self-reported activity among participants in the moderate intensity exercise group of the Generation 100 Study was performed as walking. Walking was also the most popular activity among the participants in the high intensity exercise group, but these participants did more cycling and jogging compared to the moderate group. Moreover, the findings show that older adults are able to perform high intensity exercise without strict supervision.

Both groups preferred to exercise outdoors, and only one third of the sessions were performed indoors. We also found that women more often than men exercised together with others. The information is gathered from exercise diaries from the first year of the Generation 100 Study, and includes almost 70 000 exercise logs in total.

Read the full research article in BMC Geriatrics:
Exercise patterns in older adults instructed to follow moderate- og high-intensity protocol – the Generation 100 study


Exercise did not normalize muscle function in heart failure rats

Rotte på to bein

Diastolic heart failure in rats leads to smaller and weaker leg muscles with reduced blood flow. Neither intensive nor moderate exercise for two months normalizes these impairments. The rat model in the study resembles human heart failure with obesity, hypertension and diabetes, and we believe that the total disease burden could be too high for exercise to have an impact on the skeletal musculature after only eight weeks.

Even so, the rats improved their aerobic capacity significantly following exercise, and we speculate that this beneficial change could be a result of healthier blood vessels. The study compares two calf muscles in lean, healthy rats and obese rats with diastolic heart failure. The rats with heart failure were further randomized to three groups, of which two exercise at moderate or high intensity, respectively.

Read the full research article in Journal of Cardiac Failure:
Effects of Endurance Training on Detrimental Structural, Cellular, and Functional Alterations in Skeletal Muscles of Heart Failure With Preserved Ejection Fraction


Heart and stroke patients live longer with 100 PAI

Also persons with cardiovascular disease should aim for 100 PAI to live longer. PAI is short for Personal Activity Intelligence, and we have previously shown that those who achieve 100 PAI or more every week live for an average of almost five years longer than others. Our new restults show that this is also true for heart and stroke patients.

Read more about PAI

We estimated PAI in more than 3000 participants who reported previous myocardial infarction, angina or stroke in the HUNT1 Study, and followed them for up to 30 years. Those who achieved 100 PAI or more had 36 % lower risk of dying from cardiovascular causes compared to inactive patients. They also lived for an average of five years longer than those who earned less than 100 PAI. To achieve 100 PAI was a better predictor of future health benefits than achieving today's exercise recommendations.

Read the full article in Mayo Clinic Proceedings:
Personal Activity Intelligence (PAI) and Mortality in Patients with Cardiovascular Disease, the HUNT study


Persons with atrial fibrillation should exercise

Individuals with atrial fibrillation should have individualized exercise based on an evaluation of underlying conditions. Together with colleagues at Bærum hospital, we sum up the current evidence on exercise effects in persons with atrial fibrillation.

One observational registry study shows that persons with atrial fibrillation live longer if they exercise regularly. Moreover, six smaller studies show beneficial effect of three months exercise on physical capacity, burden of atrial fibrillation and quality of life. There is a lack of data on safety of exercise and exercise in athletes with atrial fibrilllation.

Read the full research article in Clinical Research in Cardiology:
Exercise in individuals with atrial fibrillation


Unfit older adults with low education more often quit exercise programs

Less than 15 % of the 1500 participants dropped out of the Generation 100 study during the first three years. Low education, low grip strenght, low cardiorespiratory fitness and low levels of physical activity were significant predictors of dropping out. Participants with reduced memory status were also more likely to drop out. The results give important information about potential factors that increase the risk for dropping out of long-term exercise programs in older adults..

The Generation 100 study aims to find out if exercise can give older adults longer and healthier lives. The participants are randomized to three group, of which two are exercise groups. Our results also show that participants randomized to exercise – and thus more regular follow-up appointments – aslo were more likely to drop out than those randomized to the control group.

Read the full article in Medicine & Science in Sports & Exercise:
Predictors of Dropout in Exercise Trials in Older Adults


Does weather influence physical activity levels in the elderly?

Unfit older adults are less physically active during rain or snow, whereas fit older adults don't seem to let precipitation influence activity levels. Moreover, older adults are more physically active with increasing temperatures. The findings suggest that bad weather might be a barrier towards physical activity in unfit older adults.

To find these results, we studied accelerometer data from 1291 participants in the Generation 100 study. Hour-to-hour data on temperature and precipitation were collected from the Norwegian Meteorological Institute.

Read the full article in PloS one:
Do Weather Changes Influence Physical Activity Level Among Older Adults? – The Generation 100 Study


Physically active obese have lower atrial fibrillation risk

Obese and inactive persons had almost double the risk of atrial fibrillation compared to those who were normal weight and highly physically active. On the other hand, the risk was only increased by approximately 50 % in those who were obese and active. Thus, it looks like physical activity modifies the risk of atrial fibrillation in obese individuals.

We included more than 43 000 Norwegian men and women who participated in the third wave of the Nord-Trøndelag Health study between 2006 and 2008. By 2015, almost 1500 of them had a confirmed diagnosis of atrial fibrillation collected from hospital registers. Increasing levels of physical activity were linked to gradually lower risk of atrial fibrillation. Further analysis showed that this was especially true for obese persons.

Read the full article in European Journal of Preventive Cardiology:
Physical activity modifies the risk of atrial fibrillation in obese individuals: The HUNT3 study


Newborns of obese mothers have weaker hearts

In this study, exercise during pregnancy did not significantly prevent impaired cardiac function in newborns of obese women. There was, however, a small but consistent tendency towards slightly better cardiovascular measures in the exercise group. Thus, the reason for the lack of significant effects could be that many of the women exercised less than we asked them to, and that the study included quite few women.

55 women with a pre-pregnancy BMI of at least 28 kg/m2 participated in the trial, and half of them were randomized to four weekly exercise sessions consisting of both moderate intensity endurance and strength training from gestational week 14 and throughout pregnancy. However, the women only exercised for a mean of two times a week. Children in both groups were born with weaker hearts than newborns of normal weight mothers.

Read the full article in PloS one:
Cardiac Function in Newborns of Obese Women and the Effect of Exercise During Pregnancy. A randomized controlled trial


The physically active escape dementia

Physical activity seems to protect against demetia-related mortality both in persons with and without symptoms of anxiety or depression. We followed 37,000 Norwegians for up to 20 years, and exercise with high intensity was linked to the lowest risk of dying of or with dementa during follow-up. Among those who reported several symptoms of psychological distress, regular high-intensity activity was assoicated with less than half the risk of dementia-related death.

The study includes middle-aged and older women and men from seven of the largest population-based studies performed in Norway between 1994 and 2002. In total, more than 900 of the participants died of or with dementia before 2015.

Read the full article in Frontiers in Aging Neuroscience:
Leisure-time physical activity is associated with reduced risk of dementia-related mortality in adults with and without psychological distress: The Cohort of Norway


Depressed persons with poor fitness live shorter

To stay fit and avoid depressive symptoms could be of great importance for health. Participants who maintained high fitness and reported low symptoms of depression over time had the lowest risk of dying during follow-up. The study is based on information from more than 15,000 middle-aged women and men from the Nord-Trøndelag Health Study.

We used our Fitness Calculator to estimate fitness for all participants. Those who had high fitness and low symptoms of depression at both the two surveys they attended had only half the risk of dying during seven years of follow-up, compared to thos who reported persistently high levels of depressive symptoms and had low estimated fitness over time. Fit persons who improved symptoms of depression from the first to last survey also had reduced risk of early death.

Read the full article in Mayo Clinic Proceedings:
Long-term Changes in Depressive Symptoms and Estimated Cardiorespiratory Fitness and Risk of All-Cause Mortality: The Nord-Trøndelag Health Study


Physical activity is more important than weight loss for heart patients

Heart patients live longer if they are physically active over time, whereas weight loss is not associated with reduced risk of premature death. Sustained physical activity according to guidelines seems to be particularly protective against deadth from all causes and cardiovascular disease, compared to staying physically inactive.

The results are based on The Nord Trøndelag Health Study, and we followed more than 3,300 heart patients for up to 30 years. All of them had a previous heart attack or angina, and participated in at least two health surveys between 1984 and 2008. Those who stayed physically active over time had the lowest risk of dying during follow-up, but also those who went from being inactive to sufficiently physically active had reduced risk.

Read the full article in Journal of the American College of Cardiology:
Sustained Physical Activity, Not Weight Loss, Associated With Improved Survival in Coronary Heart Disease


High intensity interval training increases oxygen uptake in heart failure

High intensity interval training improves cardiorespiratory fitness mer in patients with heart failure than moderat exercise. A new meta-analysis of 13 trials has compared the two modes of exercise for patients with heart failure and reduced ejection fraction. Quality of life improved similarly with moderate and high intensity training.

CERG's Professor Øyvind Ellingsen helped Brazilian researchers with the review. The analysis includes trials with several different modes of high intensity interval training, with intervals ranging from 30 seconds to 15 minutes duration. When the researchers compared isocaloric protocols only, high intensity interval training was no longer significantly superior to moderate continous training.

Read the full article in International Journal of Cardiology:
High intensity interval training versus moderate intensity continuous training on exercise capacity and quality of life in patients with heart failure with reduced ejection fraction: A systematic review and meta-analysis


Obese children improve fitness most with high intensity

Both 4x4 interval training and continuous training with moderate intensity for three months improved cardiorespiratory fitness inn obese children. However, high intensity training was most effective.

99 obese children participated in the study. They were aged between seven and 16, og randomly allocated to three groups. All the children and their families were given nutritional advice, and the children in two groups exercised either 4x4 intervals or continuously at at more moderate intensity. Exercise had no effect on body weight or several other traditional risk factors for cardiovascular disease.

Read the full article in Sports Medicine:
Effect of High-Intensity Interval Training on Fitness, Fat Mass and Cardiometabolic Biomarkers in Children with Obesity: A Randomised Controlled Trial


High intensity interval training prevented atrial fibrillation in middle-aged rats

Aerobic interval training prevents susceptibility to atrial fibrillation in middle-aged rats. Sustained atrial fibrillation was not induced in any of the 14 rats who exercised for 16 weeks, compared to four of the eleven rats who did not exercise.

We compared middle-aged rats who exercised for 16 weeks with both young and middle-aged rates who did not exercise. After the exercise intervention, the middle-aged rats had the same aerobic fitness as young, sedentary rats. We also examined the rat hearts, and found that exercise had increased the atrial conduction velocity, which could explain the reduced vulnerability to atrial fibrillation.

Read the full article in Frontiers in Physiology:
Aerobic interval training prevents age-dependent vulnerability to atrial fibrillation in rodents


Exercise could be harmful before cardiac surgery

One bout of exercise 24 hours before cardiac surgery does not protect the heart, and might actually be harmful. Compared to no exercise, exercise increased the levels of a marker related to programmed cell death in the heart prior to surgery, and also reduced the function of the energy-producing mitochondria after surgery.

Acute exercise as preconditioning before surgery has shown promising results in rats, and we wanted to investigate if exercise just prior to surgery offers cardioprotection in humans as well. Half of the 20 patients in the study performed moderate intensity exercise the day before elective coronary artery bypass grafting at St. Olavs hospital.

Read the full article in Interactive Cardiovascular and Thoracic Surgery:
Acute exercise is not cardioprotective and may induce apoptotic signalling in heart surgery: a randomized controlled trial


Exercise normalized heart function in obese children

Three months of exercise normalized the heart's pump function at rest in obese children! High intensity interval training was even better for the hearts than moderate exercise, but both exercise modalities were more effective than nutrition advice only.

Obese children have reduced heart function compared to their healthy-weight counterparts. Our new results highlight the importance of structured exercise programs, including high intensity interval training, to improve heart health in pediatric obesity. A total of 99 Norwegian and Australian children participated in the trial.

Read the full article in Progress in Cardiovascular Diseases:
Effect of High Intensity Interval Training on Cardiac Function in Children with Obesity: a Randomised Controlled Trial


The reasons why failing hearts collapse during strenous exercise

For the first time, we have collected pieces from nine hearts of patients with heart failure after a myocardial infarction, made the pieces beat as fast as hearts do during physical activity, and compared the function with heart pieces from eight stable heart patients without an infarction.

The results show that the function of the failing hearts almost broke down completely as the heart frequency increased. The intracellular calcium handling was severly impaired at high frequencies. Calcium is important for the regulation of contraction as well as relaxation of the cardiomyocytes.

Read the full article in ESC Heart Failure:
Human cardiomyocyte calcium handling and transverse tubules in mid‐stage of post‐myocardial‐infarction heart failure


List of scientific publications

2019:

Berg, J., Undebakke, V., Rasch-Halvorsen, Ø., Aakerøy, L., Sandbakk, Ø., & Tjønna, A. E. (2019). Comparison of mitochondrial respiration in M. triceps brachii and M. vastus lateralis between elite cross-country skiers and physically active controlsFrontiers in Physiology.

Zotcheva, E., Pintzka, C. W. S., Salvesen, Ø., Selbæk, G., Håberg, A. K., & Ernstsen, L. (2019). Associations of Changes in Cardiorespiratory Fitness and Symptoms of Anxiety and Depression with Brain Volumes: The HUNT StudyFrontiers in Behavioral Neuroscience, 13, 53.

Moreria, J. B. N., Wohlwend, M., Fenk, S., Åmellem, I., Flatberg, A., Kraljevic, J., Marinovic, J., Ljubkovic, M., Bjørkøy, G., & Wisløff, U. (2019). Exercise reveals proline dehydrogenase as a potential target in heart failureProgress in Cardiovascular Diseases.

Tari, A. R., Norevik, C. S., Scrimgeour, N. R., Kobro-Flatmoen, A., Storm-Mathisen, J., Bergersen, L. H., Wrann, C. D., Selbæk, G., Kivipelto, M., Moreira, J. B. N., & Wisløff, U. (2019). Are the Neuroprotective Effects of Exercise Training Systemically Mediated?Progress in Cardiovascular Diseases.

Nauman, J., Nes, B. M., Zisko, N., Revdal, A., Myers, J., Kaminsky, L. A., & Wisløff, U. (2019). Personal activity intelligence (PAI): A new standard in activity tracking for obtaining a healthy cardiorespiratory fitness level and low cardiovascular riskProgress in Cardiovascular Diseases.

Ozemek, C., Lavie, C. J., & Rognmo, Ø. (2019). Global Physical Activity Levels-Need for InterventionProgress in Cardiovascular Diseases.

Croci, I., Coombes, J., Sandbakk, S. B., Keating, S. E., Nauman, J., Macdonald, G. A., & Wisløff, U. (2019). Non-alcoholic fatty liver disease: prevalence and all-cause mortality according to sedentary behaviour and cardiorespiratory fitness. The HUNT Study Progress in Cardiovascular Diseases.

Dalen, T., Sandmæl, S., Stevens, T. G., Hjelde, G. H., Kjøsnes, T. N., & Wisløff, U. (2019). Differences in Acceleration and High-Intensity Activities Between Small-Sided Games and Peak Periods of Official Matches in Elite Soccer PlayersThe Journal of Strength & Conditioning Research.

Undebakke, V., Berg, J., Tjønna, A. E., & Sandbakk, Ø. (2019). Comparison of Physiological and Perceptual Responses to Upper-, Lower-, and Whole-Body Exercise in Elite Cross-Country SkiersThe Journal of Strength & Conditioning Research.

Williams, C. J., Gurd, B. J., Bonafiglia, J. T., Voisin, S. A. C., Li, Z., Harvey, N., Croci, I., Taylor, J. L., Gajanand, T., Ramos, J. S., Fassett, R. G., Little, J. P., Francois, M. E., Hearon Jr., C. M., Sarma, S., Janssen, S. L. J. E., Caenenbroeck, E. M. V., Beckers, P., Cornelissen, V. A., Pattyn, N., Howden, E. K., Keating, S. E., Bye, A., Stensvold, D., Wisløff, U., Papadimitriou, I., Yan, X., Bishop, D. J., Eynon, N., & Coombes, J., (2019). A multi-centre comparison of V̇O2peak trainability between interval training and moderate intensity continuous trainingFrontiers in Physiology, 10, 19.

Lavie, C., Wisløff, U., & Blumenthal, R. S. Extreme Physical Activity and Coronary Artery Calcification—Running Heavily and Safely With “Hearts of Stone”JAMA Cardiology.

Taylor, J. L., Holland, D. J., Spathis, J. G., Beetham, K. S., Wisløff, U., Keating, S. E., & Coombes, J. S. (2019). Guidelines for the Delivery and Monitoring of High Intensity Interval Training in Clinical PopulationsProgress in Cardiovascular Diseases.

Dalen, T., Lorås, H., Hjelde, G. H., Kjøsnes, T. N., & Wisløff, U. (2019). Accelerations – a new approach to quantify physical performance decline in male elite soccer?European Journal of Sport Science, 1-9.

Kaminsky, L. A., Arena, R., Ellingsen, Ø., Harber, M. P., Myers, J., Ozemek, C., & Ross, R. (2019). Cardiorespiratory Fitness and Cardiovascular Disease-the Past, Present, and FutureProgress in cardiovascular diseases.

Rasch-Halvorsen, Ø., Hassel, E., Langhammer, A., Brumpton, B. M., & Steinshamn, S. (2019). The association between dynamic lung volume and peak oxygen uptake in a healthy general population: the HUNT studyBMC Pulmonary Medicine, 19(1), 2.

2018:

Souza, R. W., Alves, C. R., Medeiros, A., Rolim, N., Silva, G. J., Moreira, J. B., Alves, M. N., Wohlwend, M., Gebriel, M., Hagen, L., Sharma, A., Koch, L. G., Britton, S. L., Slupphaug, G., Wisløff, U., & Brum, P. C. (2018). Differential regulation of cysteine oxidative post-translational modifications in high and low aerobic capacityScientific reports, 8(1), 17772.

Shi, M., Ellingsen, Ø., Bathen, T. F., Høydal, M. A., Koch, L. G., Britton, S. L., Wisløff, U., Stølen, T., & Esmaeili, M. (2018). Skeletal muscle metabolism in rats with low and high intrinsic aerobic capacity: Effect of aging and exercise trainingPLOS ONE, 13(12), e0208703.

Letnes, J. M., Dalen, H., Vesterbekkmo, E. K., Wisløff, U., & Nes, B. M. (2018). Peak oxygen uptake and incident coronary heart disease in a healthy population: the HUNT Fitness Study European Heart Journal, ehy708

Berglund, I. J., Sørås, S. E., Relling, B. E., Lundgren, K. M., Kiel, I. A., & Moholdt, T. (2018). The relationship between maximum heart rate in a cardiorespiratory fitness test and in a maximum heart rate testJournal of Science and Medicine in Sport.

Ozemek, C., Laddu, D. R., Lavie, C. J., Claeys, H., Kaminsky, L. A., Ross, R., Wisløff, U., Arena, R., & Blair, S. N. (2018). An Update on the Role of Cardiorespiratory Fitness, Structured Exercise and Lifestyle Physical Activity in Preventing Cardiovascular Disease and Health RiskProgress in Cardiovascular Diseases.

Gunnes, M., Langhammer, B., Aamot, I. L., Lydersen, S., Ihle-Hansen, H., Indredavik, B., Kristine H. Reneflot, Schroeter, W., & Askim, T. (2018). Adherence to a Long-Term Physical Activity and Exercise Program After Stroke Applied in a Randomized Controlled TrialPhysical therapy.

Thomsen, R. S., Nilsen, T. I. L., Haugeberg, G., Bye, A., Kavanaugh, A., & Hoff, M. (2018). Effect of high-intensity interval training on cardiovascular disease risk factors and body composition in psoriatic arthritis: a randomised controlled trial. RMD Open, 4(2), e000729.

Zotcheva, E., Bergh, S., Selbæk, G., Krokstad, S., Håberg, A. K., Strand, B. H., & Ernstsen, L. (2018). Midlife Physical Activity, Psychological Distress, and Dementia Risk: The HUNT StudyJournal of Alzheimer's Disease, (Preprint), 1-9.

Tucker, W. J., Beaudry, R. I., Liang, Y., Clark, A. M., Tomczak, C. R., Nelson, M. D., Ellingsen, Ø., & Haykowsky, M. J. (2018). Meta-analysis of exercise training on left ventricular ejection fraction in heart failure with reduced ejection fraction: a 10–year updateProgress in cardiovascular diseases.

Kieffer, S. K., Croci, I., Wisløff, U., & Nauman, J. (2018). Temporal Changes in a Novel Metric of Physical Activity Tracking (Personal Activity Intelligence) and Mortality: The HUNT Study, NorwayProgress in Cardiovascular Diseases.

Reitlo, L. S., Sandbakk, S. B., Viken, H., Aspvik, N. P., Ingebrigtsen, J. E., Tan, X., Wisløff, U., & Stensvold, D. (2018). Exercise patterns in older adults instructed to follow moderate-or high-intensity exercise protocol–the generation 100 studyBMC Geriatrics, 18(1), 208.

Bowen, T. S., Herz, C., Rolim, N. P., Berre, A. M. O., Halle, M., Kricke, A., Linke, A., da Silva, G. J., Wisløff, U., & Adams, V. (2018). Effects of endurance training on detrimental structural, cellular, and functional alterations in skeletal muscles of heart failure with preserved ejection fractionJournal of cardiac failure, 24(9), 603-613.

Kieffer, S. K., Zisko, N., Coombes, J. S., Nauman, J., & Wisløff, U. (2018) Personal Activity Intelligence and Mortality in Patients with Cardiovacular Disease: The HUNT StudyMayo Clinic Proceedings, 92(5), 1191-1201

Bozi, L. H., Takano, A. P., Campos, J. C., Rolim, N., Dourado, P. M., Voltarelli, V. A., Wisløff, U., Ferreira, J. C. B., Barreto-Chaves, M. L. M., & Brum, P. C. (2018). Endoplasmic reticulum stress impairs cardiomyocyte contractility through JNK-dependent upregulation of BNIP3International Journal of Cardiology.

Myrstad, M., Malmo, V., Ulimoen, S. R., Tveit, A., & Loennechen, J. P. (2018). Exercise in individuals with atrial fibrillationClinical Research in Cardiology, 1-8.

Viken, H., Reitlo, L. S., Zisko, N., Nauman, J., Aspvik, N. P., Ingebrigtsen, J. E., Wisløff, D., & Stensvold, D. (2018). Predictors of Dropout in Exercise Trials in Older AdultsMedicine and science in sports and exercise.

Bjørnland, T., Bye, A., Ryeng, E., Wisløff, U., & Langaas, M. (2018). Powerful extreme phenotype sampling designs and score tests for genetic association studiesStatistics in medicine.

Aspvik, N. P., Viken, H., Ingebrigtsen, J. E., Zisko, N., Mehus, I., Wisløff, U., & Stensvold, D. (2018). Do weather changes influence physical activity level among older adults?–The Generation 100 studyPloS one, 13(7), e0199463.

Garnvik, L. E., Malmo, V., Janszky, I., Wisløff, U., Loennechen, J. P., & Nes, B (2018). Physical activity modifies the risk of atrial fibrillation in obese individuals: The HUNT3 studyEuropean Journal of Preventive Cardiology. 2047487318784365

Nyrnes, S. A., Garnæs, K. K., Salvesen, Ø., Timilsina, A. S., Moholdt, T., & Ingul, C. B. (2018). Cardiac function in newborns of obese women and the effect of exercise during pregnancy. A randomized controlled trial. PloS one 13(6): e0197334

Zotcheva, E., Selbæk, G., Bjertness, E., Ernstsen, L., & Strand, B. H. (2018). Leisure-time physical activity is associated with reduced risk of dementia-related mortality in adults with and without psychological distress: The Cohort of NorwayFrontiers in Aging Neuroscience, 10, 151.

Aamot, I. L., & Rognmo, Ø. (2018) Exercise therapy in intermittent claudication. E-Journal of Cardiology Practice

Carlsen, T., Salvesen, Ø., Sui, X., Lavie, C. J., Blair, S. N., Wisløff, U., & Ernstsen, L. (2018). Long-term Changes in Depressive Symptoms and Estimated Cardiorespiratory Fitness and Risk of All-Cause Mortality: The Nord-Trøndelag Health StudyMayo Clinic Proceedings.

Tjønna, A. E., Ramos, J. S., Pressler, A., Halle, M., Jungbluth, K., Ermacora, E., Salvesen, Ø., Rodrigues, J., Bueno jr., C. R., Munk, P. S., Coombes, J., & Wisløff, U. (2018). EX-MET study: exercise in prevention on of metabolic syndrome–a randomized multicenter trial: rational and designBMC public health, 18(1), 437.

Moholdt, T., Lavie, C. J., & Nauman, J. (2018). Sustained Physical Activity, Not Weight Loss, Associated With Improved Survival in Coronary Heart DiseaseJournal of the American College of Cardiology, 71(10), 1094-1101.

Neto, M. G., Durães, A. R., Conceição, L. S. R., Saquetto, M. B., Ellingsen, Ø., & Carvalho, V. O. (2018). High intensity interval training versus moderate intensity continuous training on exercise capacity and quality of life in patients with heart failure with reduced ejection fraction: A systematic review and meta-analysisInternational Journal of Cardiology.

Dias, K. A., Ingul, C. B., Tjønna, A. E., Keating, S. E., Gomersall, S. R., Follestad, T., Hosseini, M. S., Hollekim-Strand, S. M., Ro, T. B., Haram, M., & Huuse, E. M., Davies, P. S. W., Cain, P. A., Leong, G. M., & Coombes, J. S. (2017). Effect of High-Intensity Interval Training on Fitness, Fat Mass and Cardiometabolic Biomarkers in Children with Obesity: A Randomised Controlled TrialSports Medicine, 1-14.

Malmo, V., Kelly, A., Stolen, T., Garten, K. S., Rolim, N., Wisløff, U., Smith, G., & Loennechen, J. P. (2018). Aerobic interval training prevents age-dependent vulnerability to atrial fibrillation in rodentsFrontiers in Physiology, 9, 206.

Ingul, C. B. (2018). Low volume, high intensity: Time-efficient exercise for the treatment of hypertensionEuropean Journal of Preventive Cardiology, 2047487318760040.

Smenes, B. T., Bækkerud, F. H., Slagsvold, K. H., Hassel, E., Wohlwend, M., Pinho, M., Høydal, M., Wisløff, U., Rognmo, Ø., & Wahba, A. (2018). Acute exercise is not cardioprotective and may induce apoptotic signalling in heart surgery: a randomized controlled trialInteractive cardiovascular and thoracic surgery.

Ingul, C. B., Dias, K. A., Tjonna, A. E., Follestad, T., Hosseini, M. S., Timilsina, A. S., Hollekim-Strand, S. M., Ro, T. B., Davies, P. S. W., Leong, G. M., & Coombes, J. S. (2018). Effect of High Intensity Interval Training on Cardiac Function in Children with Obesity: a Randomised Controlled TrialProgress in Cardiovascular Diseases.

Høydal, M. A., Kirkeby‐Garstad, I., Karevold, A., Wiseth, R., Haaverstad, R., Wahba, A., Stølen, T., L. Contu, R., Condorelli, G., Ellingsen, Ø., Smith, G. L., Kemi, O. J., & Wisløff, U. (2018). Human cardiomyocyte calcium handling and transverse tubules in mid‐stage of post‐myocardial‐infarction heart failureESC heart failure.

2017:

Williams, C. J., Williams, M. G., Eynon, N., Ashton, K. J., Little, J. P., Wisloff, U., & Coombes, J. S. (2017). Genes to predict VO 2max trainability: a systematic reviewBMC genomics, 18(8), 831.

Stensvold, D., Sandbakk, S. B., Viken, H., Zisko, N., Reitlo, L. S., Nauman, J., Gaustad, S. E., Hassel, E., Moufack, M., Brønstad, E., Aspvik, N. P., Malmo, V., Steinshamn, S. L., Støylen, A., Anderssen, S. A., Helbostad, J. L., Rognmo, Ø, & Wisløff, U. (2017). Cardiorespiratory Reference Data in Older Adults: The Generation 100 StudyMedicine and science in sports and exercise, 49(11), 2206.

Bowen, T. S., Brauer, D., Rolim, N. P., Bækkerud, F. H., Kricke, A., Berre, A. M. O., Fischer, T., Linke, A., da Silva G. J., Wisløff, U., & Adams, V. (2017). Exercise Training Reveals Inflexibility of the Diaphragm in an Animal Model of Patients With Obesity‐Driven Heart Failure With a Preserved Ejection FractionJournal of the American Heart Association, 6(10), e006416.

Mallard, A. R., Hollekim-Strand, S. M., Coombes, J. S., & Ingul, C. B. (2017). Exercise intensity, redox homeostasis and inflammation in type 2 diabetes mellitusJournal of science and medicine in sport, 20(10), 893-898.

Zaglia, T., Ceriotti, P., Campo, A., Borile, G., Armani, A., Carullo, P., Prando, V., Coppini, R., Vida, V., Stølen, T., Wisløff, U., Cerbai, E., Stellin, G., Faggian, G., De Stefani, D., Sandri, M., Rizzuto, R., Di Lisa, F., Pozzan, T., Catalucci, D., & Mongillo, M. (2017). Content of mitochondrial calcium uniporter (MCU) in cardiomyocytes is regulated by microRNA-1 in physiologic and pathologic hypertrophyProceedings of the National Academy of Sciences, 201708772.

Wisloff, U., & Lavie, C. J. (2017). Taking Physical Activity, Exercise, and Fitness to a Higher Level. Progress in cardiovascular diseases, 60(1), 1.

Wisløff, U., Lavie, C. J., & Rognmo, Ø. (2017). Letter by Wisløff et al Regarding Article,“High-Intensity Interval Training in Patients With Heart Failure With Reduced Ejection Fraction”Circulation, 136(6), 607-608.

Leinan, I. M., Aamot, I. L., Støylen, A., Karlsen, T., & Wisløff, U. (2015). Upper arm venous compliance and fitness in stable coronary artery disease patients and healthy controlsClinical physiology and functional imaging.

Martins C, Aschehoug I, Ludviksen M, Holst J, Finlayson G, Wisloff U, Morgan L, King N, Kulseng B. (2017). High-Intensity Interval Training, Appetite, and Reward Value of Food in the Obese. Medicine & Science in Sports & Exercise 49(9):1851-1858

D'Souza, A., Pearman, C. M., Wang, Y., Nakao, S., Logantha, S. J. R., Cox, C., Bennett, H., Zhang., Y., Johnsen, A. B., Linscheid, N., Poulsen, P. C., Elliott, J., Coulson, J., McPhee, J., Robertson, A., da Costa Martins, P. A., Kitmitto, A., Wisløff, U., Cartwright, E. J., Monfredi, O., Lundby, A., Dobrzynski, H., Ocaendy, D., Morris, G. M., & Boyett, M. R. (2017). Targeting miR-423-5p Reverses Exercise Training-Induced HCN4 Channel Remodeling and Sinus BradycardiaCirculation research, CIRCRESAHA-117.

Dias, K. A., Masterson, C. E., Wallen, M. P., Tjonna, A. E., Hosseini, M. S., Davies, P. S., Cain, P. A., Leong, G. M., Arena, R., Ingul, C. B., & Coombes, J. S. (2017). Assessment of the 5-Minute Oxygen Uptake Efficiency Slope in Children With ObesityPediatric exercise science, 29(3), 350-360.

Dias, K. A., Spence, A. L., Sarma, S., Oxborough, D., Timilsina, A. S., Davies, P. S., Cain, P. A., Leong, G. M., Ingul, C. B., & Coombes, J. S. (2017). Left ventricular morphology and function in adolescents: Relations to fitness and fatnessInternational journal of cardiology, 240, 313-319.

Silva, G. J., Bye, A., el Azzouzi, H., & Wisløff, U. (2017). MicroRNAs as important regulators of exercise adaptationProgress in cardiovascular diseases, 60(1), 130-151.

Sandbakk, S. B., Nauman, J., Lavie, C. J., Wisløff, U., & Stensvold, D. (2017). Combined Association of Cardiorespiratory Fitness and Body Fatness With Cardiometabolic Risk Factors in Older Norwegian Adults: The Generation 100 StudyMayo Clinic Proceedings: Innovations, Quality & Outcomes, 1(1), 67-77.

Karlsen, T., Aamot, I. L., Haykowsky, M., & Rognmo, Ø. (2017). High Intensity Interval Training for Maximizing Health OutcomesProgress in Cardiovascular Diseases.

Zisko, N., Skjerve, K. N., Tari, A. R., Sandbakk, S. B., Wisloff, U., Nes, B. M., & Nauman, J. (2017). Personal Activity Intelligence (PAI), Sedentary Behavior and Cardiovascular Risk Factor Clustering-The HUNT Study. Progress in Cardiovascular Diseases.

Nauman, J., Tauschek, L. C., Kaminsky, L. A., Nes, B. M., & Wisløff, U. (2017). Global fitness levels: findings from a Web-based surveillance reportProgress in Cardiovascular Diseases.

Schaardenburgh, M., Wohlwend, M., Rognmo, Ø., & Mattsson, E. J. (2017). Exercise in claudicants increase or decrease walking ability and the response relates to mitochondrial functionJournal of translational medicine, 15(1), 130.

Morland, C., Andersson, K. A., Haugen, Ø. P., Hadzic, A., Kleppa, L., Gille, A., Rinholm, J. E., Palibrk, V., Diget, E. H., Kennedy, L. H., Stølen, T., Hennestad, E., Moldestad, O., Cai, Y., Puchades, M., Offermanns, S., Vervaeke, K., Bjørås, M., Wisløff, U., Storm-Mathisen, J., & Bergersen, L. H., (2017). Exercise induces cerebral VEGF and angiogenesis via the lactate receptor HCAR1Nature Communications, 8.

Zisko, N., Nauman, J., Sandbakk, S. B., Aspvik, N. P., Salvesen, Ø., Carlsen, T., Viken, H., Ingebrigtsen, J. E., Wisløff, U., & Stensvold, D. (2017). Absolute and relative accelerometer thresholds for determining the association between physical activity and metabolic syndrome in the older adults: The Generation-100 studyBMC geriatrics, 17(1), 109.

Karlsen, T., Nauman, J., Dalen, H., Langhammer, A., & Wisløff, U. (2017, May). The Combined Association of Skeletal Muscle Strength and Physical Activity on Mortality in Older Women: The HUNT2 StudyIn Mayo Clinic Proceedings (Vol. 92, No. 5, pp. 710-718). Elsevier.

Bowen, T. S., Aakerøy, L., Eisenkolb, S., Kunth, P., Bakkerud, F., Wohlwend, M., Berre, A. M. O., Fischer, T., Wisløff, U., Schuler, G., Steinshamn, S., Adams, V, & Brønstad, E., (2017). Exercise Training Reverses Extrapulmonary Impairments in Smoke-exposed MiceMedicine and science in sports and exercise, 49(5), 879-887.

Østhus, I. B. Ø., Lydersen, S., Dalen, H., Nauman, J., & Wisløff, U. (2017). Association of Telomere Length With Myocardial Infarction: A Prospective Cohort From the Population Based HUNT 2 StudyProgress in Cardiovascular Diseases.

Van Schaardenburgh, M., Wohlwend, M., Rognmo, Ø., & Mattsson, E. (2017). Calf raise exercise increases walking performance in patients with intermittent claudication. Journal of vascular surgery, 65(5), 1473-1482.

Hassel, E., Stensvold, D., Halvorsen, T., Wisløff, U., Langhammer, A., & Steinshamn, S. (2017). Lung function parameters improve prediction of VO2peak in an elderly population: The Generation 100 studyPloS one, 12(3), e0174058.

Ljones, K., Ness, H. O., Solvang-Garten, K., Gaustad, S. E., & Høydal, M. A. (2017). Acute exhaustive aerobic exercise training impair cardiomyocyte function and calcium handling in Sprague-Dawley ratsPloS one, 12(3), e0173449.

Nes, B. M., Gutvik, C. R., Lavie, C. J., Nauman, J., & Wisløff, U. (2017). Personalized activity intelligence (PAI) for prevention of cardiovascular disease and promotion of physical activityThe American journal of medicine, 130(3), 328-336.

Ellingsen, Ø., Halle, M., Conraads, V., Støylen, A., Dalen, H., Delagardelle, C.,  Larsen, A-I., Hole, T., Mezzqani, A., van Craenenbroeck E. M., Videm, V., Beckers, P. J., Christie, J. W., Winzer, E. B., Mangne, N., Woitek, F., Höllriegel, R., Pressler, A. P., Monk-Hansen, T., Snoer, M., Feiereisen, P., Valborgland, T., Kjekshus, J. K., Hambrecht, R., Gielen, S., Karlsen, T., Prescott, E. B. & Linke, A. (2017). High-Intensity Interval Training in Patients With Heart Failure With Reduced Ejection FractionCirculation, 135(9), 839-849.

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