Influence of gravity compensation on muscle activity during reach and retrieval in healthy elderly |
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| Authors: | GB Prange LAC Kallenberg MJA Jannink AHA Stienen H van der Kooij MJ IJzerman HJ Hermens |
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| Institution: | 1. Roessingh Research & Development, Enschede, The Netherlands;2. Institute of Biomedical Technology, University of Twente, Enschede, The Netherlands;1. Depto. de Neuroquímica, Instituto Nacional de Neurología y Neurocirugía, MVS, SSA, Mexico City, Mexico;2. Maestría en Ciencias Farmacéuticas, Universidad Autónoma Metropolitana, Unidad Xochimilco, Mexico City, Mexico;3. Laboratorio de Neuroplasticidad, División de Neurociencias, Torre de Investigación, Instituto Nacional de Rehabilitacion, Mexico City, Mexico;4. Neurofarmalogía Molecular, Departamento de Sistemas Biológicos, Universidad Autónoma Metropolitana, Unidad Xochimilco, Mexico City, Mexico;1. Faculty of Mechanical Engineering and Management, Poznan University of Technology, 3 Piotrowo St., 60-965 Poznan, Poland;2. Faculty of Mechanical Engineering, University of Zielona Gora, 4 Prof. Z. Szafrana Street, 65-516 Zielona Gora, Poland,;3. Turbocharger Research Institute, University of Huddersfield, Huddersfield HD1 3DH, UK,;4. Faculty of Mechanical Engineering, Opole University of Technology, 76 Proszkowska St., 45-758 Opole, Poland;1. Department of Physical Therapy and Rehabilitation Science, University of Maryland, Baltimore, Baltimore, MD;2. Maryland Exercise and Robotics Center of Excellence, Baltimore Veteran Affairs Medical Center, Baltimore, MD;3. Department of Medicine, School of Medicine, University of Maryland, Baltimore, Baltimore, MD;4. Faculty of Health Sciences, University of Southampton, Southampton, United Kingdom;1. IfSS der Albert-Ludwigs-Universität Freiburg, Freiburg, Germany;2. Department of Sport Science, University of Konstanz, Constance, Germany |
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| Abstract: | IntroductionArm support like gravity compensation may improve arm movements during stroke rehabilitation. It is unknown how gravity compensation affects muscle activation patterns during reach and retrieval movements. Since muscle activity during reach is represented by a component varying with movement velocity and a component supposedly counteracting gravity, we hypothesized that gravity compensation decreases the amplitude of muscle activity, but does not affect the pattern. To examine this, we compared muscle activity during well defined movements with and without gravity compensation in healthy elderly.MethodsTen subjects performed reach and retrieval movements with and without gravity compensation. Muscle activity of biceps, triceps, anterior, middle and posterior parts of deltoid and upper trapezius was compared between the two conditions.ResultsThe level of muscle activity was lower with gravity compensation in all muscles, reaching significance in biceps, anterior deltoid and trapezius (p ? 0.026). The muscle activation pattern did not differ between movements with and without gravity compensation (p ? 0.662).DiscussionGravity compensation only influenced the level of muscle activity but not the muscle activation pattern in terms of timing. Future studies should examine if the influence of gravity compensation is comparable for stroke patients. This may stimulate early and intensive training during rehabilitation. |
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