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Time course and variability of tendinous vibration-induced postural reactions in forward and backward directions
Affiliation:1. BioNR Research Lab, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada;2. Centre intersectoriel en santé durable, Université du Québec à Chicoutimi, Chicoutimi, QC, Canada;3. IRSST, Institut de recherche Robert-Sauvé en santé et en sécurité de travail, Montréal, QC, Canada;1. Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway;2. Institute of Training Science and Sport Informatics, German Sport University Cologne, Cologne, Germany;1. U.S. Army Research Laboratory, Human Research and Engineering Directorate, Research Triangle Park, Durham, NC, USA;2. U.S. Army Research Laboratory, Human Research and Engineering Directorate, Aberdeen Proving Ground, MD, USA;3. U.S. Army Research Laboratory, Human Research and Engineering Directorate, ARL West, Playa Vista, CA, USA;1. German Center for Vertigo and Balance Disorders, University of Munich, Germany;2. Department of Neurology, University of Munich, Germany;3. Schön Klinik Bad Aibling, Germany;4. Institute for Clinical Neuroscience, University of Munich, Germany;1. Department of Physical Therapy, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata City, Niigata, Japan;2. Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, 1398 Shimami-cho, Kita-ku, Niigata City, Niigata, Japan;3. Department of Rehabilitation, Yokohama Namiki Rehabilitation Hospital, 2-8-1 Namiki, Kanazawa-ku, Yokohama City, Kanagawa, Japan;1. Laboratory of Motor Control and Learning, Department of Physical Education and Sport Science, Aristotle University of Thessaloniki, Greece;2. Laboratory of Neuromechanics, Department of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Greece;1. Centre for Studies in Aging, Sunnybrook Health Sciences Centre, Toronto, ON, Canada;2. Department of Kinesiology and Health, Georgia State University, Atlanta, GA, USA;3. Center for Human Growth and Development, University of Michigan, Ann Arbor, MI, USA;4. INEFC, Department of Health and Applied Sciences, University of Barcelona, Barcelona, Spain
Abstract:Mechanical vibration of tendons induces large postural reactions (PR-VIB) but little is known about how these reactions vary within and between subjects. We investigated the intra- and inter-individual variability of PR-VIB and determined the reliability of center of pressure (COP) measures. Bipodal postural control (eyes closed) of 30 healthy adults were evaluated using a force platform under 02 conditions: bilateral VIB of the tibialis anterior (TA) and Achilles tendons (ACH-T) at 80 Hz. Each condition consisted of 03 trials of 30 s duration (Baseline: 10 s; VIB: 10 s; POST-VIB: 10 s). The Amplitude and Velocity of the COP in the antero-posterior/medio-lateral (AP/ML) directions were recorded and analyzed according to 5 time-windows incremented every 2 s of vibration (i.e. the first 2 s; 4 s; 6 s; 8 s & 10 s), whereas the COP position/AP was monitored every 0.5 s. All postural parameters increased significantly during TA and ACH-T vibration compared to the Baseline. The reliability of the COP measures showed good ICC scores (0.40-0.84) and measurement errors that varied depending on the duration of VIB time-windows. The COP position/AP reveals a lower intra- and inter-subject variability of PR-VIB in the first 2 s of VIB. The metrological characteristics of PR-VIB should be investigated further to guide their future use by clinicians and researchers.
Keywords:Tendon vibration  Postural control  Postural reactions  Variability  Reliability
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