Support surface related changes in feedforward and feedback control of standing posture |
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| Institution: | 1. Faculté de médecine, université Paris Descartes, Sorbonne Paris Cité, 12, rue de l’École-de-Médecine, 75006 Paris, France;2. Service de chirurgie cancérologique gynécologique et du sein, hôpital européen Georges-Pompidou (HEGP), AP–HP, 20, rue Leblanc, 75908 Paris cedex 15, France;1. Department of Rehabilitation Medicine, MOVE Research Institute Amsterdam, The EMGO+ Institute for Health and Care Research, VU University Medical Center, De Boelelaan 1117, 1081HV Amsterdam, The Netherlands;2. MOVE Research Institute Amsterdam, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081BT Amsterdam, The Netherlands;3. Department of Rehabilitation Medicine, MOVE Research Institute Amsterdam, VU University Medical Center, De Boelelaan 1117, 1081HV Amsterdam, The Netherlands;1. Département de kinésiologie, Université Laval, Québec, Québec, Canada;2. Centre de recherche du CHU de Québec, Québec, Québec, Canada;3. Département des sciences de l’activité physique, Université du Québec à Trois-Rivières, Trois-Rivières, Québec, Canada;4. Clinique d’Orthopédie Infantile de Québec, Québec, Québec, Canada;1. University of Montana, Missoula, MT, USA;2. MedStar National Rehabilitation Hospital, Washington DC, USA;3. MedStar Health Research Institute, Columbia, MD, USA;4. Georgetown University Medical Center, Washington DC, USA;5. George Mason University, Fairfax, VA, USA;6. Washington DC VA Medical Center, Washington, DC, USA;1. Laboratory of Biomechanical Engineering, MIRA Institute for Biomedical Technology and Technical Medicine, University of Twente, Enschede, The Netherlands;2. Department of Neurology, Medical Spectrum Twente, Enschede, The Netherlands;3. Department of Biomechanical Engineering, Delft University of Technology, Delft, The Netherlands |
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| Abstract: | The aim of the study was to investigate the effect of different support surfaces on feedforward and feedback components of postural control. Nine healthy subjects were exposed to external perturbations applied to their shoulders while standing on a rigid platform, foam, and wobble board with eyes open or closed.Electrical activity of nine trunk and leg muscles and displacements of the center of pressure were recorded and analyzed during the time frames typical of feedforward and feedback postural adjustments. Feedforward control of posture was characterized by earlier activation of anterior muscles when the subjects stood on foam compared to a wobble board or a firm surface. In addition, the magnitude of feedforward muscle activity was the largest when the foam was used. During the feedback control, anterior muscles were activated prior to posterior muscles irrespective of the nature of surface. Moreover, the largest muscle activity was seen when the supporting surface was foam. Maximum CoP displacement occurred when subjects were standing on a rigid surface.Altering support surface affects both feedforward and feedback components of postural control. This information should be taken into consideration in planning rehabilitation interventions geared towards improvement of balance. |
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| Keywords: | Postural control Support surface EMG |
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