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Espen Alexander F. Ihlen

Espen Alexander F. Ihlen

Researcher
Department of Neuromedicine and Movement Science
Faculty of Medicine and Health Sciences

espen.ihlen@ntnu.no
+4747354674 Bevegelsessenteret, Øya
web-site software Project 2021-2025: DeepInMotion
About Publications Teaching Media

About

Bakgrunn og aktiviteter

Espen A. F. Ihlen is associate Professor at Department of Neuromedicine and Human Movement Science (INB). He has background in Human Movement Science, Informatics, Mathematics, and Physics. His main interest is application of machine learning and artificial intelligence (AI) in clinical movement analysis.

Education

  • Bachelor in Human Movement Science (1999-2003)
  • Master in Human Movement Science (2003-2007)
  • PhD in clinical medicine (2009-2014)

Research

  • Signalprocessing of human movement and activity data
  • Machine learning used in prediction models and risk assessments of movement related problems
  • Non-linear time series analyses focusing on:
  • Hilbert spectral analyses
  • Wavelet analyses and decompositions
  • Multifractal analyses
  • Multiplicative cascading processes
  • Lyapunov stability
  • Fractional stability
  • Application of analyses and models to movements of older adults and infants at risk of motor disorders

Projects

  • DeepInMotion: Explainable artificial intelligent system to discover new infant movement biomarkers for early detection of disease (project period 2021-2025)
  • PROMISE: Early diagnosis and intervention in infants at risk of motor disability

Teaching assignments

  • Introduction to signal processing in Matlab (BEV3201)
  • Biomechanics (BEV2005)
  • Measurement of physical activity (BEV2101)

 

Publications

  • Chronological
  • By category
  • See all publications in Cristin

2022

  • Groos, Daniel; Adde, Lars; Aubert, Sindre Aarnes; Boswell, Lynn; De Regnier, Raye-Ann; Fjørtoft, Toril Larsson; Gaebler-Spira, Deborah; Haukeland, Andreas; Loennecken, Marianne; Msall, Michael; Møinichen, Unn Inger; Pascal, Aurelie; Peyton, Colleen; Ramampiaro, Heri; Schreiber, Michael D.; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Thomas, Niranjan; van den Broeck, Christine; Øberg, Gunn Kristin; Ihlen, Espen Alexander F.; Støen, Ragnhild. (2022) Development and Validation of a Deep Learning Method to Predict Cerebral Palsy from Spontaneous Movements in Infants at High Risk. JAMA Network Open. volum 5 (7).
    Academic article
  • Groos, Daniel; Adde, Lars; Støen, Ragnhild; Ramampiaro, Heri; Ihlen, Espen Alexander F.. (2022) Towards human-level performance on automatic pose estimation of infant spontaneous movements. Computerized Medical Imaging and Graphics. volum 95.
    Academic article

2021

  • Adde, Lars; Brown, Annemette; van den Broeck, Christine; DeCoen, Kris; Eriksen, Beate Horsberg; Fjørtoft, Toril Larsson; Groos, Daniel; Ihlen, Espen Alexander F.; Osland, Siril; Pascal, Aurelie; Paulsen, Henriette; Skog, Ole-Morten; Sivertsen, Wiebke; Støen, Ragnhild. (2021) In-Motion-App for remote General Movement Assessment: a multi-site observational study. BMJ Open. volum 11 (3).
    Academic article
  • Awais, Muhammad; Chiari, Lorenzo; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Palmerini, Luca. (2021) Classical machine learning versus deep learning for the older adults free-living activity classification. Sensors. volum 21 (14).
    Academic article
  • Elfmark, Ola; Ettema, Gertjan; Groos, Daniel; Ihlen, Espen Alexander F.; Velta, Rune; Haugen, Per; Bråten, Steinar; Gilgien, Matthias. (2021) Performance analysis in ski jumping with a differential global navigation satellite system and video-based pose estimation. Sensors. volum 21 (16).
    Academic article
  • Goihl, Tobias; Ihlen, Espen Alexander F.; Bardal, Ellen Marie; Ustad, Astrid; Roeleveld, Karin; Brændvik, Siri Merete. (2021) Effects of Ankle-Foot Orthoses on acceleration and energy cost of walking in children and adolescents with cerebral palsy. Prosthetics and orthotics international. volum 45 (6).
    Academic article
  • Groos, Daniel; Adde, Lars; Aubert, Sindre Aarnes; Haukeland, Andreas; Ramampiaro, Heri; Støen, Ragnhild; Ihlen, Espen Alexander F.. (2021) Fully automated clinical movement analysis from videos using skeleton-based deep learning. Gait & Posture. volum 90.
    Summary/Abstract
  • Groos, Daniel; Adde, Lars; Støen, Ragnhild; Ramampiaro, Heri; Ihlen, Espen Alexander F.. (2021) New automatic, efficient, and highly precise tracking of infant spontaneous movements. Developmental Medicine & Child Neurology. volum 63.
    Summary/Abstract

2020

  • Bergquist, Ronny; Nerz, Corinna; Taraldsen, Kristin; Mellone, Sabato; Ihlen, Espen Alexander F.; Vereijken, Beatrix; Helbostad, Jorunn L.; Becker, Clemens; Mikolaizak, A. Stefanie. (2020) Predicting Advanced Balance Ability and Mobility with an Instrumented Timed Up and Go Test. Sensors. volum 20 (17).
    Academic article
  • Groos, Daniel; Adde, Lars; Ihlen, Espen Alexander F.. (2020) Approaching human precision on automatic markerless tracking of human movements. Gait & Posture. volum 81.
    Summary/Abstract
  • Groos, Daniel; Ramampiaro, Heri; Ihlen, Espen Alexander F.. (2020) EfficientPose: Scalable single-person pose estimation. Applied intelligence (Boston).
    Academic article

2019

  • Awais, Muhammad; Chiari, Lorenzo; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Palmerini, Luca. (2019) Physical Activity Classification for Elderly People in Free-Living Conditions. IEEE journal of biomedical and health informatics. volum 23 (1).
    Academic article
  • Groos, Daniel; Aurlien, Kristian; Ramampiaro, Heri; Ihlen, Espen Alexander F.; deRegnier, RA; Peyton, Colleen; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Thomas, Niranjan; Adde, Lars. (2019) Deep Learning‐based infant motion tracking facilitating early detection of cerebral palsy. Developmental Medicine & Child Neurology. volum 61.
    Summary/Abstract
  • Ihlen, Espen Alexander F.; Støen, Ragnhild; Boswell, Lynn; de-Regnier, Raye-Ann; Fjørtoft, Toril Larsson; Gaebler-Spira, Deborah; Labori, Inger Cathrine; Loennecken, Marianne; Msall, Michael E.; Møinichen, Unn Inger; Peyton, Colleen; Schreiber, Michael D.; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Vågen, Randi Tynes; Øberg, Gunn Kristin; Adde, Lars. (2019) Machine Learning of Infant Spontaneous Movements for the Early Prediction of Cerebral Palsy: A Multi-Site Cohort Study. Journal of Clinical Medicine. volum 9 (1).
    Academic article
  • Støen, Ragnhild; Boswell, Lynn; De Regnier, Raye-Ann; Fjørtoft, Toril Larsson; Gaebler-Spira, Deborah; Ihlen, Espen Alexander F.; Labori, Cathrine; Loennecken, Marianne; Msall, Michael E.; Møinichen, Unn Inger; Peyton, Colleen; Russow, Annamarie; Schreiber, Michael D.; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Vågen, Randi Tynes; Øberg, Gunn Kristin; Adde, Lars. (2019) The predictive accuracy of the general movement assessment for cerebral palsy: A prospective, observational study of high-risk infants in a clinical follow-up setting. Journal of Clinical Medicine. volum 8 (11).
    Academic article

2018

  • Adde, Lars; Yang, Hong; Sæther, Rannei; Jensenius, Alexander Refsum; Ihlen, Espen Alexander F.; Cao, Jia-yan; Støen, Ragnhild. (2018) Characteristics of general movements in preterm infants assessed by computer-based video analysis. Physiotherapy Theory and Practice. volum 34 (4).
    Academic article
  • Bourke, Alan; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.. (2018) Development of a gold-standard method for the identification of sedentary, light and moderate physical activities in older adults: Definitions for video annotation. Journal of Science and Medicine in Sport.
    Academic article
  • Ihlen, Espen Alexander F.; Schooten, K S; Bruijn, S M; Dieën, J H; Vereijken, Beatrix; Helbostad, Jorunn L.; Pijnappels, Mirjam. (2018) Improved prediction of falls in community-dwelling older adults through phase-dependent entropy of daily-life walking. Frontiers in Aging Neuroscience. volum 10.
    Academic article

2017

  • Bourke, Alan; Ihlen, Espen Alexander F.; Bergquist, Ronny; Wik, Per Bendik; Vereijken, Beatrix; Helbostad, Jorunn L.. (2017) A physical activity reference data-set recorded from older adults using body-worn inertial sensors and video Technology - The ADAPT study data-set. Sensors. volum 17 (3).
    Academic article
  • Ihlen, Espen Alexander F.; van Schooten, Kimberley S; Bruijn, Sjoerd M; Pijnappels, Mirjam; van Dieen, Jaap H. (2017) Fractional stability of trunk acceleration dynamics of daily-life walking: toward a unified concept of gait stability. Frontiers in Physiology. volum 8.
    Academic article

2016

  • Bourke, Alan; Ihlen, Espen Alexander F.; Van de Ven, Pepijn W.J.; Nelson, John; Helbostad, Jorunn L.. (2016) Video analysis validation of a real-time physical activity detection algorithm based on a single waist mounted tri-axial accelerometer sensor. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. volum 2016-October.
    Academic article
  • Bourke, Alan; Ihlen, Espen Alexander F.; Wik, Per Bendik; Bergquist, Ronny; Helbostad, Jorunn L.. (2016) Validation of the activPAL3 for Measurement of Physical Activity in Older Adults in a Semi-Structured Protocol Using Video Analysis. Gait & Posture. volum 49 (128).
    Summary/Abstract
  • Bourke, Alan; Klenk, Jochen; Schwickert, Lars; Aminian, Kamiar; Ihlen, Espen Alexander F.; Mellone, Sabato; Helbostad, Jorunn L.; Chiari, Lorenzo; Becker, Clemens. (2016) Fall detection algorithms for real-world falls harvested from lumbar sensors in the elderly population: A machine learning approach. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. volum 2016-October.
    Academic article
  • Ihlen, Espen Alexander F.; Weiss, Aner; Bourke, Alan; Helbostad, Jorunn L.; Hausdorff, Jeffrey M.. (2016) The complexity of daily life walking in older adult community-dwelling fallers and non-fallers. Journal of Biomechanics. volum 49 (9).
    Academic article
  • Awais, Muhammad; Palmerini, Luca; Bourke, Alan; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Chiari, Lorenzo. (2016) Performance Evaluation of State of the Art Systems for Psysical Activity Classification of Older Subjects Using Inertial Sensors in a Real Life Scenario: A Benchmark Study. Sensors. volum 16.
    Academic article
  • Bardal, Ellen Marie; Roeleveld, Karin; Ihlen, Espen Alexander F.; Mork, Paul Jarle. (2016) Micro movements of the upper limb in fibromyalgia: The relation to proprioceptive accuracy and visual feedback. Journal of Electromyography & Kinesiology. volum 26.
    Academic article
  • Bårdstu, Hilde; Ihlen, Espen Alexander F.; Bardal, Ellen Marie; Mork, Paul Jarle. (2016) Detection of physical activity types with accelerometers in adolescents in free-living settings. Gait & Posture. volum 49.
    Summary/Abstract
  • Ihlen, Espen Alexander F.; Hausdorff, Jeffrey M.. (2016) Nonlinear analysis for human movement variability. Journal of Biomechanics. volum 49 (13).
    Review
  • Ihlen, Espen Alexander F.; Weiss, Aner; Beck, Yoav; Helbostad, Jorunn L.; Hausdorff, Jeffrey M.. (2016) A comparison study of local dynamic stability measures of daily life walking in older adult community-dwelling fallers and non-fallers. Journal of Biomechanics. volum 49 (9).
    Academic article
  • Klenk, Jochen; Schwickert, Lars; Palmerini, Luca; Mellone, Sabato; Bourke, Alan; Ihlen, Espen Alexander F.; Kerse, Ngaire; Hauer, Klaus; Pijnappels, Mirjam; Synofzik, Matthis; Srulijes, Karin; Maetzler, Walter; Helbostad, Jorunn L.; Zijlstra, Wiebren; Aminian, Kamiar; Todd, Christopher; Chiari, Lorenzo; Becker, Clemens. (2016) The FARSEEING real-world fall repository: a large-scale collaborative database to collect and share sensor signals from real-world falls. European Review of Aging and Physical Activity. volum 13:8 (1).
    Academic article
  • Skjæret-Maroni, Nina; Vonstad, Elise Klæbo; Ihlen, Espen Alexander F.; Tan, Xiang chun; Helbostad, Jorunn L.; Vereijken, Beatrix. (2016) Exergaming in older adults: Movement characteristics while playing stepping games. Frontiers in Psychology. volum 7:964.
    Academic article

2015

  • Bourke, Alan; Klenk, Jochen; Schwickert, Lars; Aminian, Kamair; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Chiari, Lorenzo; Becker, Clemens. (2015) Temporal and kinematic variables for real-world falls harvested from lumbar sensors in the elderly population. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. volum 2015-November.
    Academic article
  • Ihlen, Espen Alexander F.; Weiss, A; Helbostad, Jorunn L.; Hausdorff, Jeffrey M. (2015) The Discriminant Value of Phase-Dependent Local Dynamic Stability of Daily Life Walking in Older Adult Community-Dwelling Fallers and Nonfallers. BioMed Research International. volum 2015.
    Academic article
  • Srulijes, Karin; Mack, David J; Klenk, Jochen; Schwickert, Lars; Ihlen, Espen Alexander F.; Schwenk, Michael; Lindemann, Ulrich; Meyer, Miriam; KC, Srijana; Hobert, Markus A; Brockmann, Kathrin; Wurster, Isabel; Pomper, Jörn K; Synofzik, Matthis; Schneider, Erich; Ilg, Uwe; Berg, Daniela; Maetzler, Walter; Becker, Clemens. (2015) Association between vestibulo-ocular reflex suppression, balance, gait, and fall risk in ageing and neurodegenerative disease: Protocol of a one-year prospective follow-up study. BMC Neurology. volum 15 (1).
    Academic article
  • Thingstad, Pernille; Egerton, Thorlene; Ihlen, Espen Alexander F.; Taraldsen, Kristin; Moe-Nilssen, Rolf; Helbostad, Jorunn L.. (2015) Identification of gait domains and key gait variables following hip fracture. BMC Geriatrics. volum 15:150.
    Academic article

2014

  • Ihlen, Espen Alexander F.. (2014) Age-related changes in inter-joint coordination during walking. Journal of applied physiology. volum 117 (2).
    Academic article
  • Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2014) Detection of co-regulation of local structure and magnitude of stride time variability using a new local detrended fluctuation analysis. Gait & Posture. volum 39 (1).
    Academic article

2013

  • Ihlen, Espen Alexander F.. (2013) Multifractal analyses of response time series: A comparative study. Behavior Research Methods. volum 45 (4).
    Academic article
  • Ihlen, Espen Alexander F.. (2013) The influence of power law distributions on long-range trial dependency of response times. Journal of Mathematical Psychology. volum 57 (5).
    Academic article
  • Ihlen, Espen Alexander F.; Skjæret, Nina; Vereijken, Beatrix. (2013) The influence of center-of-mass movements on the variation in the structure of human postural sway. Journal of Biomechanics. volum 46 (3).
    Academic article
  • Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2013) Identifying Multiplicative Interactions Between Temporal Scales of Human Movement Variability. Annals of Biomedical Engineering. volum 41 (8).
    Academic article
  • Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2013) Multifractal formalisms of human behavior. Human Movement Science. volum 32 (4).
    Academic article

2012

  • Ihlen, Espen Alexander F.. (2012) Introduction to multifractal detrended fluctuation analysis in Matlab. Frontiers in Physiology. volum 3 (141).
    Scientific translation/review
  • Ihlen, Espen Alexander F.; Goihl, Tobias; Wik, Per Bendik; Sletvold, Olav; Helbostad, Jorunn L.; Vereijken, Beatrix. (2012) Phase-dependent changes in local dynamic stability of human gait. Journal of Biomechanics. volum 45 (13).
    Academic article
  • Ihlen, Espen Alexander F.; Sletvold, Olav; Goihl, Tobias; Wik, Per Bendik; Vereijken, Beatrix; Helbostad, Jorunn L.. (2012) Older adults have unstable gait kinematics during weight transfer. Journal of Biomechanics. volum 45 (9).
    Academic article

2010

  • Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2010) Interaction-Dominant Dynamics in Human Cognition: Beyond 1/f(alpha) Fluctuation. Journal of experimental psychology. General. volum 139 (3).
    Academic article

2009

  • Ihlen, Espen Alexander F.. (2009) A comparison of two Hilbert spectral analyses of heart rate variability. Medical and Biological Engineering and Computing. volum 47 (10).
    Academic article

Scientific articles

  • Groos, Daniel; Adde, Lars; Aubert, Sindre Aarnes; Boswell, Lynn; De Regnier, Raye-Ann; Fjørtoft, Toril Larsson; Gaebler-Spira, Deborah; Haukeland, Andreas; Loennecken, Marianne; Msall, Michael; Møinichen, Unn Inger; Pascal, Aurelie; Peyton, Colleen; Ramampiaro, Heri; Schreiber, Michael D.; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Thomas, Niranjan; van den Broeck, Christine; Øberg, Gunn Kristin; Ihlen, Espen Alexander F.; Støen, Ragnhild. (2022) Development and Validation of a Deep Learning Method to Predict Cerebral Palsy from Spontaneous Movements in Infants at High Risk. JAMA Network Open. volum 5 (7).
    Academic article
  • Groos, Daniel; Adde, Lars; Støen, Ragnhild; Ramampiaro, Heri; Ihlen, Espen Alexander F.. (2022) Towards human-level performance on automatic pose estimation of infant spontaneous movements. Computerized Medical Imaging and Graphics. volum 95.
    Academic article
  • Adde, Lars; Brown, Annemette; van den Broeck, Christine; DeCoen, Kris; Eriksen, Beate Horsberg; Fjørtoft, Toril Larsson; Groos, Daniel; Ihlen, Espen Alexander F.; Osland, Siril; Pascal, Aurelie; Paulsen, Henriette; Skog, Ole-Morten; Sivertsen, Wiebke; Støen, Ragnhild. (2021) In-Motion-App for remote General Movement Assessment: a multi-site observational study. BMJ Open. volum 11 (3).
    Academic article
  • Awais, Muhammad; Chiari, Lorenzo; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Palmerini, Luca. (2021) Classical machine learning versus deep learning for the older adults free-living activity classification. Sensors. volum 21 (14).
    Academic article
  • Elfmark, Ola; Ettema, Gertjan; Groos, Daniel; Ihlen, Espen Alexander F.; Velta, Rune; Haugen, Per; Bråten, Steinar; Gilgien, Matthias. (2021) Performance analysis in ski jumping with a differential global navigation satellite system and video-based pose estimation. Sensors. volum 21 (16).
    Academic article
  • Goihl, Tobias; Ihlen, Espen Alexander F.; Bardal, Ellen Marie; Ustad, Astrid; Roeleveld, Karin; Brændvik, Siri Merete. (2021) Effects of Ankle-Foot Orthoses on acceleration and energy cost of walking in children and adolescents with cerebral palsy. Prosthetics and orthotics international. volum 45 (6).
    Academic article
  • Bergquist, Ronny; Nerz, Corinna; Taraldsen, Kristin; Mellone, Sabato; Ihlen, Espen Alexander F.; Vereijken, Beatrix; Helbostad, Jorunn L.; Becker, Clemens; Mikolaizak, A. Stefanie. (2020) Predicting Advanced Balance Ability and Mobility with an Instrumented Timed Up and Go Test. Sensors. volum 20 (17).
    Academic article
  • Groos, Daniel; Ramampiaro, Heri; Ihlen, Espen Alexander F.. (2020) EfficientPose: Scalable single-person pose estimation. Applied intelligence (Boston).
    Academic article
  • Awais, Muhammad; Chiari, Lorenzo; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Palmerini, Luca. (2019) Physical Activity Classification for Elderly People in Free-Living Conditions. IEEE journal of biomedical and health informatics. volum 23 (1).
    Academic article
  • Ihlen, Espen Alexander F.; Støen, Ragnhild; Boswell, Lynn; de-Regnier, Raye-Ann; Fjørtoft, Toril Larsson; Gaebler-Spira, Deborah; Labori, Inger Cathrine; Loennecken, Marianne; Msall, Michael E.; Møinichen, Unn Inger; Peyton, Colleen; Schreiber, Michael D.; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Vågen, Randi Tynes; Øberg, Gunn Kristin; Adde, Lars. (2019) Machine Learning of Infant Spontaneous Movements for the Early Prediction of Cerebral Palsy: A Multi-Site Cohort Study. Journal of Clinical Medicine. volum 9 (1).
    Academic article
  • Støen, Ragnhild; Boswell, Lynn; De Regnier, Raye-Ann; Fjørtoft, Toril Larsson; Gaebler-Spira, Deborah; Ihlen, Espen Alexander F.; Labori, Cathrine; Loennecken, Marianne; Msall, Michael E.; Møinichen, Unn Inger; Peyton, Colleen; Russow, Annamarie; Schreiber, Michael D.; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Vågen, Randi Tynes; Øberg, Gunn Kristin; Adde, Lars. (2019) The predictive accuracy of the general movement assessment for cerebral palsy: A prospective, observational study of high-risk infants in a clinical follow-up setting. Journal of Clinical Medicine. volum 8 (11).
    Academic article
  • Adde, Lars; Yang, Hong; Sæther, Rannei; Jensenius, Alexander Refsum; Ihlen, Espen Alexander F.; Cao, Jia-yan; Støen, Ragnhild. (2018) Characteristics of general movements in preterm infants assessed by computer-based video analysis. Physiotherapy Theory and Practice. volum 34 (4).
    Academic article
  • Bourke, Alan; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.. (2018) Development of a gold-standard method for the identification of sedentary, light and moderate physical activities in older adults: Definitions for video annotation. Journal of Science and Medicine in Sport.
    Academic article
  • Ihlen, Espen Alexander F.; Schooten, K S; Bruijn, S M; Dieën, J H; Vereijken, Beatrix; Helbostad, Jorunn L.; Pijnappels, Mirjam. (2018) Improved prediction of falls in community-dwelling older adults through phase-dependent entropy of daily-life walking. Frontiers in Aging Neuroscience. volum 10.
    Academic article
  • Bourke, Alan; Ihlen, Espen Alexander F.; Bergquist, Ronny; Wik, Per Bendik; Vereijken, Beatrix; Helbostad, Jorunn L.. (2017) A physical activity reference data-set recorded from older adults using body-worn inertial sensors and video Technology - The ADAPT study data-set. Sensors. volum 17 (3).
    Academic article
  • Ihlen, Espen Alexander F.; van Schooten, Kimberley S; Bruijn, Sjoerd M; Pijnappels, Mirjam; van Dieen, Jaap H. (2017) Fractional stability of trunk acceleration dynamics of daily-life walking: toward a unified concept of gait stability. Frontiers in Physiology. volum 8.
    Academic article
  • Bourke, Alan; Ihlen, Espen Alexander F.; Van de Ven, Pepijn W.J.; Nelson, John; Helbostad, Jorunn L.. (2016) Video analysis validation of a real-time physical activity detection algorithm based on a single waist mounted tri-axial accelerometer sensor. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. volum 2016-October.
    Academic article
  • Bourke, Alan; Klenk, Jochen; Schwickert, Lars; Aminian, Kamiar; Ihlen, Espen Alexander F.; Mellone, Sabato; Helbostad, Jorunn L.; Chiari, Lorenzo; Becker, Clemens. (2016) Fall detection algorithms for real-world falls harvested from lumbar sensors in the elderly population: A machine learning approach. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. volum 2016-October.
    Academic article
  • Ihlen, Espen Alexander F.; Weiss, Aner; Bourke, Alan; Helbostad, Jorunn L.; Hausdorff, Jeffrey M.. (2016) The complexity of daily life walking in older adult community-dwelling fallers and non-fallers. Journal of Biomechanics. volum 49 (9).
    Academic article
  • Awais, Muhammad; Palmerini, Luca; Bourke, Alan; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Chiari, Lorenzo. (2016) Performance Evaluation of State of the Art Systems for Psysical Activity Classification of Older Subjects Using Inertial Sensors in a Real Life Scenario: A Benchmark Study. Sensors. volum 16.
    Academic article
  • Bardal, Ellen Marie; Roeleveld, Karin; Ihlen, Espen Alexander F.; Mork, Paul Jarle. (2016) Micro movements of the upper limb in fibromyalgia: The relation to proprioceptive accuracy and visual feedback. Journal of Electromyography & Kinesiology. volum 26.
    Academic article
  • Ihlen, Espen Alexander F.; Weiss, Aner; Beck, Yoav; Helbostad, Jorunn L.; Hausdorff, Jeffrey M.. (2016) A comparison study of local dynamic stability measures of daily life walking in older adult community-dwelling fallers and non-fallers. Journal of Biomechanics. volum 49 (9).
    Academic article
  • Klenk, Jochen; Schwickert, Lars; Palmerini, Luca; Mellone, Sabato; Bourke, Alan; Ihlen, Espen Alexander F.; Kerse, Ngaire; Hauer, Klaus; Pijnappels, Mirjam; Synofzik, Matthis; Srulijes, Karin; Maetzler, Walter; Helbostad, Jorunn L.; Zijlstra, Wiebren; Aminian, Kamiar; Todd, Christopher; Chiari, Lorenzo; Becker, Clemens. (2016) The FARSEEING real-world fall repository: a large-scale collaborative database to collect and share sensor signals from real-world falls. European Review of Aging and Physical Activity. volum 13:8 (1).
    Academic article
  • Skjæret-Maroni, Nina; Vonstad, Elise Klæbo; Ihlen, Espen Alexander F.; Tan, Xiang chun; Helbostad, Jorunn L.; Vereijken, Beatrix. (2016) Exergaming in older adults: Movement characteristics while playing stepping games. Frontiers in Psychology. volum 7:964.
    Academic article
  • Bourke, Alan; Klenk, Jochen; Schwickert, Lars; Aminian, Kamair; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Chiari, Lorenzo; Becker, Clemens. (2015) Temporal and kinematic variables for real-world falls harvested from lumbar sensors in the elderly population. IEEE Engineering in Medicine and Biology Society. Conference Proceedings. volum 2015-November.
    Academic article
  • Ihlen, Espen Alexander F.; Weiss, A; Helbostad, Jorunn L.; Hausdorff, Jeffrey M. (2015) The Discriminant Value of Phase-Dependent Local Dynamic Stability of Daily Life Walking in Older Adult Community-Dwelling Fallers and Nonfallers. BioMed Research International. volum 2015.
    Academic article
  • Srulijes, Karin; Mack, David J; Klenk, Jochen; Schwickert, Lars; Ihlen, Espen Alexander F.; Schwenk, Michael; Lindemann, Ulrich; Meyer, Miriam; KC, Srijana; Hobert, Markus A; Brockmann, Kathrin; Wurster, Isabel; Pomper, Jörn K; Synofzik, Matthis; Schneider, Erich; Ilg, Uwe; Berg, Daniela; Maetzler, Walter; Becker, Clemens. (2015) Association between vestibulo-ocular reflex suppression, balance, gait, and fall risk in ageing and neurodegenerative disease: Protocol of a one-year prospective follow-up study. BMC Neurology. volum 15 (1).
    Academic article
  • Thingstad, Pernille; Egerton, Thorlene; Ihlen, Espen Alexander F.; Taraldsen, Kristin; Moe-Nilssen, Rolf; Helbostad, Jorunn L.. (2015) Identification of gait domains and key gait variables following hip fracture. BMC Geriatrics. volum 15:150.
    Academic article
  • Ihlen, Espen Alexander F.. (2014) Age-related changes in inter-joint coordination during walking. Journal of applied physiology. volum 117 (2).
    Academic article
  • Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2014) Detection of co-regulation of local structure and magnitude of stride time variability using a new local detrended fluctuation analysis. Gait & Posture. volum 39 (1).
    Academic article
  • Ihlen, Espen Alexander F.. (2013) Multifractal analyses of response time series: A comparative study. Behavior Research Methods. volum 45 (4).
    Academic article
  • Ihlen, Espen Alexander F.. (2013) The influence of power law distributions on long-range trial dependency of response times. Journal of Mathematical Psychology. volum 57 (5).
    Academic article
  • Ihlen, Espen Alexander F.; Skjæret, Nina; Vereijken, Beatrix. (2013) The influence of center-of-mass movements on the variation in the structure of human postural sway. Journal of Biomechanics. volum 46 (3).
    Academic article
  • Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2013) Identifying Multiplicative Interactions Between Temporal Scales of Human Movement Variability. Annals of Biomedical Engineering. volum 41 (8).
    Academic article
  • Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2013) Multifractal formalisms of human behavior. Human Movement Science. volum 32 (4).
    Academic article
  • Ihlen, Espen Alexander F.; Goihl, Tobias; Wik, Per Bendik; Sletvold, Olav; Helbostad, Jorunn L.; Vereijken, Beatrix. (2012) Phase-dependent changes in local dynamic stability of human gait. Journal of Biomechanics. volum 45 (13).
    Academic article
  • Ihlen, Espen Alexander F.; Sletvold, Olav; Goihl, Tobias; Wik, Per Bendik; Vereijken, Beatrix; Helbostad, Jorunn L.. (2012) Older adults have unstable gait kinematics during weight transfer. Journal of Biomechanics. volum 45 (9).
    Academic article
  • Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2010) Interaction-Dominant Dynamics in Human Cognition: Beyond 1/f(alpha) Fluctuation. Journal of experimental psychology. General. volum 139 (3).
    Academic article
  • Ihlen, Espen Alexander F.. (2009) A comparison of two Hilbert spectral analyses of heart rate variability. Medical and Biological Engineering and Computing. volum 47 (10).
    Academic article

Journal publications

  • Groos, Daniel; Adde, Lars; Aubert, Sindre Aarnes; Haukeland, Andreas; Ramampiaro, Heri; Støen, Ragnhild; Ihlen, Espen Alexander F.. (2021) Fully automated clinical movement analysis from videos using skeleton-based deep learning. Gait & Posture. volum 90.
    Summary/Abstract
  • Groos, Daniel; Adde, Lars; Støen, Ragnhild; Ramampiaro, Heri; Ihlen, Espen Alexander F.. (2021) New automatic, efficient, and highly precise tracking of infant spontaneous movements. Developmental Medicine & Child Neurology. volum 63.
    Summary/Abstract
  • Groos, Daniel; Adde, Lars; Ihlen, Espen Alexander F.. (2020) Approaching human precision on automatic markerless tracking of human movements. Gait & Posture. volum 81.
    Summary/Abstract
  • Groos, Daniel; Aurlien, Kristian; Ramampiaro, Heri; Ihlen, Espen Alexander F.; deRegnier, RA; Peyton, Colleen; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Thomas, Niranjan; Adde, Lars. (2019) Deep Learning‐based infant motion tracking facilitating early detection of cerebral palsy. Developmental Medicine & Child Neurology. volum 61.
    Summary/Abstract
  • Bourke, Alan; Ihlen, Espen Alexander F.; Wik, Per Bendik; Bergquist, Ronny; Helbostad, Jorunn L.. (2016) Validation of the activPAL3 for Measurement of Physical Activity in Older Adults in a Semi-Structured Protocol Using Video Analysis. Gait & Posture. volum 49 (128).
    Summary/Abstract
  • Bårdstu, Hilde; Ihlen, Espen Alexander F.; Bardal, Ellen Marie; Mork, Paul Jarle. (2016) Detection of physical activity types with accelerometers in adolescents in free-living settings. Gait & Posture. volum 49.
    Summary/Abstract
  • Ihlen, Espen Alexander F.; Hausdorff, Jeffrey M.. (2016) Nonlinear analysis for human movement variability. Journal of Biomechanics. volum 49 (13).
    Review
  • Ihlen, Espen Alexander F.. (2012) Introduction to multifractal detrended fluctuation analysis in Matlab. Frontiers in Physiology. volum 3 (141).
    Scientific translation/review

Teaching

Courses

  • BEV2102 - Biomechanics and human movement analysis
  • BEV2005 - Biomechanics
  • BEV3201 - Introduction to Signal Processing in Matlab

Media

2021

  • Academic lecture
    Adde, Lars; Ihlen, Espen Alexander F.. (2021) Automated GM tracking and prediction of CP. International Virtual Symposium . Elsass Fonden; Copenhagen, Denmark. 2021-06-07 - 2021-06-09.
  • Academic lecture
    Groos, Daniel; Adde, Lars; Aubert, Sindre Aarnes; Haukeland, Andreas; Ramampiaro, Heri; Støen, Ragnhild; Ihlen, Espen Alexander F.. (2021) Fully automated clinical movement analysis from videos using skeleton-based deep learning. ESMAC 2021 . European Society of Movement Analysis for Adults & Children; 2021-10-14 - 2021-10-15.
  • Academic lecture
    Groos, Daniel; Adde, Lars; Støen, Ragnhild; Ramampiaro, Heri; Ihlen, Espen Alexander F.. (2021) New automatic, efficient, and highly precise tracking of infant spontaneous movements. European Academy of Childhood Disability 2021 . European Academy of Childhood Disability; Virtual. 2021-05-20 - 2021-06-10.

2020

  • Academic lecture
    Groos, Daniel; Adde, Lars; Ihlen, Espen Alexander F.. (2020) Approaching human precision on automatic markerless tracking of human movements. Virtual ESMAC 2020 . European Society of Movement Analysis for Adults & Children; 2020-09-17.

2019

  • Poster
    Adde, Lars; Brown, Annemette; Ihlen, Espen Alexander F.; Pascal, Aurelie; Paulsen, Henriette; Skog, Ole Morten; Ustad, Astrid; Støen, Ragnhild. (2019) Feasibility of video recordings of infants’ spontaneous movement by parents for remote General Movement Assessment. European Academy for Children with Disabilities (EACD) Annual Meeting ; 2019-05-22 - 2019-05-25.
  • Poster
    Groos, Daniel; Aurlien, Kristian; Ramampiaro, Heri; Ihlen, Espen Alexander F.; deRegnier, RA; Peyton, Colleen; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Thomas, Niranjan; Adde, Lars. (2019) Deep Learning-based infant motion tracking facilitating early detection of cerebral palsy. European Academy of Childhood Disability 2019 . European Academy of Childhood Disability; Paris. 2019-05-23 - 2019-05-25.
  • Academic lecture
    Ihlen, Espen Alexander F.; Støen, Ragnhild; Fjørtoft, Toril Larsson; Gaebler-spira, Deborah; Msall, Me; Peyton, Colleen; de-Regnier, Raye-Ann; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Adde, Lars. (2019) Machine learning based prediction of ambulatory versus non-ambulatory motor function in children with cerebral palsy. European Academy for Children with Disabilities (EACD) Annual Meeting ; 2019-05-22 - 2019-05-25.

2018

  • Academic lecture
    Adde, Lars; Ihlen, Espen Alexander F.; Fjørtoft, Toril Larsson; Labori, Cathrine; Loennecken, Marianne; Møinicken, Unn inger; Rahmati, Hodjatolah; Sandstrøm, Per Gunnar; Silberg, Inger Elisabeth; Songstad, Nils Thomas; Tiarks, Angelique; Vaagen, Randi; Øberg, Gunn Kristin; Støen, Ragnhild. (2018) Computer-based detection of cerebral palsy (CP) in infants before 5 months’ corrected age. Pediatric Academic Societies Meeting ; 2018-05-05 - 2018-05-08.

2017

  • Poster
    Bourke, Alan; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.. (2017) An video analysis of the distribution of uninterrupted walking bout in an older adult population. , International Society of Posture and Gait Research world congress ; Fort Lauderdale. 2017-06-30 - 2017-07-04.
  • Poster
    Bourke, Alan; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.. (2017) Development of Definitions for Annotation of Physical Activity Performed By Elderly Participants Recorded Using Video Technology. 5th International Conference on Ambulatory Monitoring of Physical Activity and Movement (ICAMPAM) ; Maryland. 2017-06-21 - 2017-06-23.
  • Poster
    Bourke, Alan; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.. (2017) The Effect on Human Activity Recognition Classifier Accuracy With Changing Windowing Overlap. 5th International Conference on Ambulatory Monitoring of Physical Activity and Movement (ICAMPAM) ; Maryland. 2017-06-21 - 2017-06-23.
  • Poster
    Bourke, Alan; Ihlen, Espen Alexander F.; Wik, Per Bendik; Bergquist, Ronny; Helbostad, Jorunn L.. (2017) Validation of the ActiGraph GT3X+ for measurement of physical activity in older adults in a semi-structured protocol using video analysis. International Society of Posture and Gait Research world congress ; Fort Lauderdale. 2017-06-30 - 2017-07-04.
  • Academic lecture
    Ihlen, Espen Alexander F.; Sjoerd M, de Bruijn; Ann, Hallemans. (2017) Stability in gait. Conference for the European Society for Movement analysis in Adults and Children (ESMAC) . NTNU; Trondheim. 2017-09-06 - 2017-09-09.
  • Academic lecture
    Ihlen, Espen Alexander F.; van Schooten, Kimberley S; Bruijn, Sjoerd M; Dieën, Jaap H. van; Vereijken, Beatrix; Helbostad, Jorunn L.; Pijnappels, Mirjam. (2017) Fall prediction model based on new gait features. MOBEX . RBK; Stuttgart. 2017-01-20 - 2017-01-21.
  • Academic lecture
    Ihlen, Espen Alexander F.; van Schooten, Kimberley S; Bruijn, Sjoerd M; Pijnappels, Mirjam; Dieën, Jaap H. van. (2017) Fractional stability of human gait: Towards a unified concept of gait stability. International Society of Posture and Gait Research world congress ; Fort Lauderdale. 2017-06-30 - 2017-07-04.
  • Poster
    Ihlen, Espen Alexander F.; van Schooten, Kimberley S; Bruijn, Sjoerd M; van Dieen, Jaap H; Vereijken, Beatrix; Helbostad, Jorunn L.; Pijnappels, Mirjam. (2017) Improved prediction of falls in community-dwelling older adults through phase-dependent irregularity of daily-life walking. International Society of Posture and Gait Research world congress ; Fort Lauderdale. 2017-06-30 - 2017-07-04.
  • Poster
    Ihlen, Espen Alexander F.; Weiss, Aner; Helbostad, Jorunn Lægdheim; Hausdorff, Jeffrey M. (2017) The dynamics of daily-life walking in older adult fallers and non-fallers: Is loss of complexity a reflection of loss of dynamic stability?. International Society of Posture and Gait Research world congress ; Fort Lauderdale. 2017-06-30 - 2017-07-04.

2016

  • Academic lecture
    Vereijken, Beatrix; Cole, Whitney G.; Ihlen, Espen Alexander F.; Adolph, Karen E.. (2016) Learning to walk: Identifying independent components and gait domains in newly walking infants. European Society for Movement Analysis in Adults and Children . ESMAC; Sevilla. 2016-09-28 - 2016-10-01.

2015

  • Lecture
    Adde, Lars; Jensenius, Alexander Refsum; Ihlen, Espen Alexander F.; Støen, Ragnhild. (2015) Spatial distribution of general movements in preterm born infants assessed by computer-based video analysis. European Academy of Childhood Disability ; 2015-05-27 - 2015-05-30.
  • Poster
    Skjæret-Maroni, Nina; Ihlen, Espen Alexander F.; Helbostad, Jorunn L.; Vereijken, Beatrix. (2015) Exergaming in older adults: The effect of the games on movement characteristics during gameplay. ISPGR World Congress ; Sevilla. 2015-06-28 - 2015-07-02.

2014

  • Academic lecture
    Ihlen, Espen Alexander F.; Støen, Ragnhild; Adde, Lars. (2014) Computerized fidgety movement assessment in infants with high risk of later neurological impairments. Clinical movement Analysis World Conference ; 2014-09-29 - 2014-10-04.
  • Poster
    Ihlen, Espen Alexander F.; Vereijken, Beatrix; Goihl, Tobias; Wik, Per Bendik; Sletvold, Olav; Helbostad, Jorunn L.. (2014) A new wavelet-based assessment of inter-joint coordination in walking of young and healthy older adults. World Congress ISPGR . ISPGR; Vancouver. 2014-06-29 - 2014-07-03.
  • Lecture
    Thingstad, Pernille; Egerton, Thorlene; Ihlen, Espen Alexander F.; Taraldsen, Kristin; Moe-Nilssen, Rolf; Helbostad, Jorunn L.. (2014) A four domain model of gait in older hip-farcture patients based on factor analysis. International Society of Posture and Gait research ; 2014-06-29 - 2014-07-03.

2013

  • Poster
    Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2013) Detection of active co-regulation of the structure and magnitude of stride time variability. ISPGR . University in Akita, Japan; Akita. 2013-06-22 - 2013-06-26.

2012

  • Academic lecture
    Ihlen, Espen Alexander F.; Goihl, Tobias; Wik, Per Bendik; Sletvold, Olav; Helbostad, Jorunn L.; Vereijken, Beatrix. (2012) Phase-dependent changes in local dynamical stability of human gait. ISPGR and gait and mental function 2012 . NTNU; Trondheim. 2012-06-24 - 2012-06-28.
  • Poster
    Ihlen, Espen Alexander F.; Goihl, Tobias; Wik, Per Bendik; Sletvold, Olav; Vereijken, Beatrix; Helbostad, Jorunn L.. (2012) Gait kinematics in old adults are instable during weight transfer. Joint World Congress of ISPGR and Gait & Mental function 2012 ; Trondheim. 2012-06-24 - 2012-06-28.
  • Academic lecture
    Ihlen, Espen Alexander F.; Lund, Selma; Vereijken, Beatrix. (2012) Posture during relaxed standing is controlles intermittently rather than continously. Joint World Congress of ISPGR and Gait & Mental Function 2012 ; Trondheim. 2012-06-24 - 2012-06-28.
  • Academic lecture
    Skjæret, Nina; Vereijken, Beatrix; Ihlen, Espen Alexander F.. (2012) Bipedal asymmetries during relaxed standing reveal postural control deficits in young adults with CP. Joint World Congress of ISPGR and Gait & Mental Function ; Trondheim. 2012-06-24 - 2012-06-28.

2011

  • Academic lecture
    Ihlen, Espen Alexander F.; Goihl, Tobias; Wik, Per Bendik; Sletvold, Olav; Vereijken, Beatrix; Helbostad, Jorunn L.. (2011) Gait stability in older adults. Seminar i "Human Motor Control" nettverk . Forskningsgruppe i geriatri og Medisin Teknikk; Trondheim. 2011-11-22 - 2011-11-22.

2010

  • Academic lecture
    Ihlen, Espen Alexander F.. (2010) Stability in human gait. Human Motor Control konferanse . Human Motor Control (HMC) nettverk ved NTNU; Trondheim. 2010-05-27 - 2010-05-28.
  • Academic lecture
    Ihlen, Espen Alexander F.. (2010) Variability in prolonged and fatiguing gait in older persons. Mobility and exercise in older persons (MOBEX) . Forskningsgruppe Geriatri; Trondheim. 2010-01-15 - 2010-01-16.
  • Poster
    Ihlen, Espen Alexander F.; Vereijken, Beatrix. (2010) Interaction-dominant dynamics in human behavior. 11th European Workshop on Ecological Psychology . University of the Mediterranean, Marseilles; Fréjus. 2010-06-09 - 2010-06-12.
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