Journal
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
Volume 20, Issue 1, Pages 170-179Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jelekin.2009.03.006
Keywords
Spaceflight; Spine; Berlin bed-rest study; Median frequency; Motor control
Categories
Funding
- European Space Agency [14431/02/NL/SH2]
- Charite Campus Benjamin Franklin
- DLR (German AeroSpace)
- MSD Sharp and Dohme
- Lilly Germany
- Servier Germany
- Hoffmann-LaRoche
- Siemens
- Novartis
- Danone
- Seca
- Alexander von Humboldt Foundation
Ask authors/readers for more resources
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. (C) 2009 Published by Elsevier Ltd.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available