Effects of supportive hand contact on reactive postural control during support perturbations |
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| Institution: | 1. Jožef Stefan Institute, Department for Automation, Biocybernetics and Robotics, Jamova cesta 39, SI-1000 Ljubljana, Slovenia;2. University of Primorska, Science and Research Center, Institute for Kinesiology Research, Garibaldijeva 1, SI-6000 Koper, Slovenia;3. S2P Ltd., Laboratory for Motor Control and Motor Behaviour, Technological park 19, SI-1000 Ljubljana, Slovenia;1. University Hospital Pellenberg, Clinical Motion Analysis Laboratory, University Hospital, Leuven, Belgium;2. KU Leuven Department of Rehabilitation Sciences, Leuven, Belgium;3. KU Leuven Department of Development and Regeneration, Leuven, Belgium;4. University Hospital Pellenberg, Department of Orthopedics, Leuven, Belgium;5. Department of Rehabilitation Medicine, MOVE Research Institute Amsterdam, VU University Medical Center, Amsterdam, the Netherlands;6. KU Leuven Department of Mechanical Engineering, Leuven, Belgium;1. Department of Physical Therapy, University of Delaware, Newark, DE 19713, USA;2. Department of Kinesiology & Health Education, University of Texas, Austin, TX 78712, USA;3. Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA;1. Clinical Psychology Health Emphasis, Ferkauf Graduate School of Psychology, Yeshiva University, United States;2. Saul R. Korey Department of Neurology, Albert Einstein College of Medicine, Yeshiva University, United States;3. Ferkauf Graduate School of Psychology, Department of Neurology, Albert Einstein College of Medicine, Yeshiva University, United States;1. Stereotactic and Functional Neurosurgery, CTO Hospital, ASL RMC, Rome, Italy;2. Biomechanics and Movement Analysis Laboratory, Physical Medicine and Rehabilitation, University of Rome La Sapienza, Italy;3. Clinical Neurophysiology, CTO Hospital, ASL RMC, Rome, Italy;4. IRCCS San Raffaele Pisana, Rome, Italy;5. Department of Biotechnological and Applied Clinical Sciences (DISCAB),University of L’Aquila, L’Aquila, Italy;1. Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA;2. Mayo Graduate School, Mayo Clinic College of Medicine, Center for Clinical and Translational Science, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA;3. Rehabilitation Medicine Research Center, Department of Physical Medicine and Rehabilitation, Mayo Clinic, 200 First Street SW, Rochester, MN 55905, USA;1. Medical Information Division, Gifu University Hospital, Japan;2. Department of Otolaryngology, Gifu University Graduate School of Medicine, Japan |
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| Abstract: | There are many everyday situations in which a supportive hand contact is required for an individual to counteract various postural perturbations. By emulating situations when balance of an individual is challenged, we examined functional role of supportive hand contact at different locations where balance of an individual was perturbed by translational perturbations of the support surface. We examined the effects of handle location, perturbation direction and perturbation intensity on the postural control and the forces generated in the handle.There were significantly larger centre-of-pressure (CoP) displacements for perturbations in posterior direction than for perturbations in anterior direction. Besides, the perturbation intensity significantly affected the peak CoP displacement in both perturbation directions. However, the position of the handle had no effects on the peak CoP displacement. On the contrary, there were significant effects of perturbation direction, perturbation intensity and handle position on the maximal force in the handle. The effect of the handle position was significant for the perturbations in posterior direction where the lowest maximal forces were recorded in the handle located at the shoulder height. They were comparable to the forces in the handle at eye height and significantly lower than the forces in the handle located either lower or further away from the shoulder.In summary, our results indicate that although the location of a supportive hand contact has no effect on the peak CoP displacement of healthy individuals, it affects the forces that an individual needs to exert on the handle in order to counteract support perturbations. |
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| Keywords: | Falls Handle Grasping Postural stability Balance recovery |
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