The effect of external perturbations on variability in joint coupling and single joint variability |
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| Affiliation: | 1. Human Movement Research Center (CIMOHU), Universidad de Costa Rica, Costa Rica;2. Engineering Research Institute (INII), Universidad de Costa Rica, Costa Rica;1. University of Wisconsin-La Crosse, La Crosse Institute for Movement Science, Department of Health Professions, Physical Therapy Program, La Crosse, WI 54601, USA;2. Cleveland State University, Mechanical Engineering Department, Cleveland, OH, USA;1. Faculty of Kinesiology, University of Calgary, Calgary, Canada;2. Running Injury Clinic, Calgary, Canada;3. Department of Computer Science, University of Calgary, Calgary, Canada;4. Department of Biochemistry & Molecular Biology, University of Calgary, Calgary, Canada;5. Faculty of Nursing, University of Calgary, Calgary, Canada;1. Research Group for Musculoskeletal Rehabilitation, Department of Rehabilitation Sciences, Katholieke Universiteit Leuven, Tervuursevest 101, B-3001 Heverlee, Belgium;2. Human Movement Biomechanics Research Group, Department of Biomedical Kinesiology, Katholieke Universiteit Leuven, Tervuursevest 101, B-3001 Heverlee, Belgium;3. Physical Activity, Sports & Health Research Group, Department of Rehabilitation Sciences, Katholieke Universiteit Leuven, Tervuursevest 101, B-3001 Heverlee, Belgium;1. Faculty of Sports Science, Ningbo University, China;2. Research Academy of Grand Health Interdisciplinary, Ningbo University, China;3. Human Movement Research Lab, Anta Sports Products Limited, China;4. Department of Orthopaedics, Ningbo Ninth Hospital, China;5. School of Science and Sport, University of the West of Scotland, UK |
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| Abstract: | This paper explores the effect of goal-oriented external perturbations created by elastic tubes attached to the hip and ankles on lower limb joint variability and hip–knee and knee–ankle coordination variability during running. Kinematics of ten healthy male runners were analysed prior to and following a 7-week tube running intervention while running with and one without this constraint. The training intervention was based on variable training aspects to increase within-movement variability and adaptability of the running pattern. To analyse the effects of the tubes on the running pattern, the phase plot vector length deviation (i.e., the standard deviation of the phase plot vector length) for the within-joint variability and the continuous relative phase variability for the joint coupling variability were calculated. Results revealed acute increases of variability in both parameters. However, after the intervention, variability of the tube running situation returned to normal for all couplings and joints except the knee. No transfer effects to normal running were observed. This suggests very rapid adaptations to such perturbations. In the long-term, it may ask for more or different variations. |
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| Keywords: | Single joint variability Coupling variability Perturbations Running |
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