| Enhanced physiological tremor deteriorates plantar flexor torque steadiness after bed rest. | |
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MedLine Citation:
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PMID: 21131213 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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This study evaluated the effectiveness of resistance training to preserve submaximal plantar flexor (PF) torque steadiness following 60days of bed rest (BR). Twenty-two healthy male subjects underwent either BR only (CTR, n=8), or BR plus resistance training (RT, n=14). The magnitude of torque fluctuations during steady submaximal isometric PF contractions (20%, 40%, 60% and 80% of maximum) were assessed before and after BR. Across contraction intensities, torque fluctuations (coefficient of variation, CV) increased more (P<0.05) after BR for CTR (from 0.31±0.10 to 0.92±0.63; P<0.001), than for RT (from 0.30±0.09 to 0.54±0.27; P<0.01). A shift in the spectral content of torque fluctuations towards increased rhythmic activity between 6.5 and 20Hz was observed in CTR only (P<0.05). H-reflex amplitude (H(max)/M(max) ratio) declined across groups from 0.57±0.18 before BR to 0.44±0.14 following BR (P<0.01) without correlation to CV. The present study showed that increased torque fluctuation after BR resulted from enhanced physiological tremor. Resistance training prevented the spectral shift in isometric PF torque fluctuation and offset ∼50% of the decline in performance associated with long-term BR. |
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Authors:
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Edwin R Mulder; Astrid M Horstman; Karin Gerrits; Mark Massa; Bert U Kleine; Arnold de Haan; Daniel L Belavý; Dieter Felsenberg; Machiel Zwarts; Dick F Stegeman |
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Publication Detail:
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Type: Journal Article Date: 2010-12-04 |
Journal Detail:
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Title: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology Volume: 21 ISSN: 1873-5711 ISO Abbreviation: J Electromyogr Kinesiol Publication Date: 2011 Apr |
Date Detail:
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Created Date: 2011-02-15 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9109125 Medline TA: J Electromyogr Kinesiol Country: England |
Other Details:
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Languages: eng Pagination: 384-93 Citation Subset: IM |
Copyright Information:
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Copyright © 2010. Published by Elsevier Ltd. |
Affiliation:
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Institute of Aerospace Medicine, Division of Space Physiology, German Space Center, Cologne, Germany; Research Institute MOVE, Faculty of Human Movement Sciences, VU University, Amsterdam, The Netherlands; Donders Institute for Brain, Cognition and Behaviour, Centre for Neuroscience, Radboud University Nijmegen Medical Centre, Department of Neurology/Clinical Neurophysiology, Nijmegen, The Netherlands. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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