Resistive vibration exercise during bed-rest reduces motor control changes in the lumbo-pelvic musculature |
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Authors: | Daniel L BelavýAuthor Vitae Stephen J WilsonAuthor VitaeGabriele ArmbrechtAuthor Vitae Jörn RittwegerAuthor Vitae Dieter FelsenbergAuthor VitaeCarolyn A RichardsonAuthor Vitae |
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Institution: | a Charité Universitätsmedzin Berlin, Zentrum für Muskel- und Knochenforschung, Hindenburgdamm 30, 12200 Berlin, Germany b School of Health and Rehabilitation Sciences, The University of Queensland, Brisbane, QLD 4072, Australia c School of Information Technology and Electrical Engineering, The University of Queensland, Brisbane, QLD 4072, Australia d German Aerospace Center (DLR), Institute of Aerospace Medicine and Space Physiology, Linder Höhe, 51147 Köln, Germany e Institute for Biomedical Research into Human Movement and Health, Manchester Metropolitan University, M1 5GD Manchester, UK |
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Abstract: | To understand the effects of a resistive vibration exercise (RVE) countermeasure on changes in lumbo-pelvic muscle motor control during prolonged bed-rest, 20 male subjects took part in the Berlin Bed-Rest Study (in 2003-2005) and were randomised to a RVE group or an inactive control group. Surface electromyographic signals recorded from five superficial lumbo-pelvic muscles during a repetitive knee movement task. The task, which required stabilisation of the lumbo-pelvic region, was performed at multiple movement speeds and at multiple time points during and after bed-rest. After excluding effects that could be attributed to increases in subcutaneous fat changes and improvements in movement skill, we found that the RVE intervention ameliorated the generalised increases in activity ratios between movement speeds (p ? 0.012), reductions in lumbo-pelvic extensor and flexor co-contraction (p = 0.058) and increases in root-mean-square electromyographic amplitude (p = 0.001) of the lumbar erector spinae muscles. Effects of RVE on preventing increases in amplitude-modulation (p = 0.23) of the lumbar erector spinae muscles were not significant. Few significant changes in activation-timing were seen. The RVE intervention during bed-rest, with indirect loading of the spine during exercise, was capable of reducing some, but not all, motor control changes in the lumbo-pelvic musculature during and after bed-rest. |
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Keywords: | Spaceflight Timing Signal processing Phasic Body composition Low back pain |
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