Large postural fluctuations but unchanged postural sway dynamics during tiptoe standing compared to quiet standing |
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| Authors: | Hiroko Tanabe Keisuke Fujii Motoki Kouzaki |
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| Institution: | 1. University of Muenster, Institute of Sport and Exercise Sciences, Department of Motion Science, D-48149 Münster, Germany;2. Center for Nonlinear Science, University of Muenster, Germany;3. Department of Sports Medicine and Health Promotion, Friedrich Schiller University, Jena, Germany;4. University Hospital Jena, Clinic for Trauma-, Hand- and Reconstructive Surgery, Division for Motor Research, Pathophysiology and Biomechanics, Jena, Germany;1. Department of Oral Kinesiology, Academic Centre for Dentistry Amsterdam (ACTA), MOVE Research Institute Amsterdam, University of Amsterdam and VU University Amsterdam, Amsterdam, The Netherlands;2. Koç University, School of Medicine, Istanbul, Turkey;1. Laboratory of Motor Behavior and Adapted Physical Activity, School of Physical Education and Sport Science, Aristotle University of Thessaloniki, Greece;2. Laboratory of Neuromechanics, School of Physical Education and Sport Science at Serres, Aristotle University of Thessaloniki, Greece;1. School of Physical Education, Sport and Exercise Sciences, University of Otago, Dunedin 9013 New Zealand;2. Neuromusculoskeletal Assessment and Clinical Biomechanics Laboratory – LaBClin, Florianópolis, Santa Catarina, Brazil;1. College of Sport and Health Science, Ritsumeikan University, Shiga, Japan;2. Department of Rehabilitation Science, University of Kentucky, Lexington, KY, United States |
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| Abstract: | The purpose of this study was to detect the characteristics of center of pressure (COP) movement during tiptoe standing (TS) compared to quiet standing (QS). Eight healthy subjects were asked to perform QS and TS on a force platform. During standing, surface electromyograms (EMGs) were recorded from the soleus (SOL), flexor hallucis brevis (FHB), medial gastrocnemius (MG), lateral gastrocnemius (LG), and tibialis anterior (TA) muscles. The path length and rectangular area of the COP trajectory were significantly larger during TS than during QS. In contrast, irrespective of standing condition, the scaling coefficients in the short and long regions were above and below 0.5, respectively. The coherence spectrum between the COP and EMG from the SOL and FHB muscles was statistically significant during TS at frequencies up to 17 Hz, while that for the QS was only significant below 1 Hz. In conclusion, the control of COP movement during TS was similar to that during QS despite large COP fluctuations during TS. Our results suggest that unstable posture during TS is compensated for by the activities of the SOL and FHB muscles, which enhance postural control. |
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