Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14929
Title: Influence of prolonged bed-rest on spectral and temporal electromyographic motor control characteristics of the superficial lumbo-pelvic musculature
Authors: Belavy, DL
Ng, JK 
Wilson, SJ
Armbrecht, G
Stegeman, DF
Rittweger, J
Felsenberg, D
Richardson, CA
Keywords: Berlin bed-rest study
Median frequency
Motor control
Spaceflight
Spine
Issue Date: 2010
Publisher: Elsevier
Source: Journal of electromyography and kinesiology, 2010, v. 20, no. 1, p. 170-179 How to cite?
Journal: Journal of electromyography and kinesiology 
Abstract: Little is known about the motor control of the lumbo-pelvic musculature in microgravity and its simulation (bed-rest). Analysis of spectral and temporal electromyographic variables can provide information on motor control relevant for normal function. This study examined the effect of 56-days of bed-rest with 1-year follow-up in 10 male subjects on the median frequency and the activation timing in surface electromyographic recordings from five superficial lumbo-pelvic muscles during a repetitive knee movement task. Trunk fat mass (from whole body-composition measurements) and movement accuracy as possible explanatory factors were included. Increased median frequency was observed in the lumbar erector spinae starting late in bed-rest, but this was not seen in its synergist, the thoracic erector spinae (p < .0001). These changes persisted up to 1-year after bed-rest and were independent of changes in body-composition or movement accuracy. Analysis suggested decreases of median frequency (p < .0001) in the abdominal and gluteal muscles to result from increased (p < .01) trunk fat levels during and after bed-rest. No changes in lumbo-pelvic muscle activation timing were seen. The results suggest that bed-rest particularly affects the shorter lumbar erector spinae and that the temporal sequencing of superficial lumbo-pelvic muscle activation is relatively robust.
URI: http://hdl.handle.net/10397/14929
ISSN: 1050-6411
EISSN: 1873-5711
DOI: 10.1016/j.jelekin.2009.03.006
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