|
|||||
|
|
Influence of prolonged bed-rest on spectral and temporal electromyographic motor control characteristics of the superficial lumbo-pelvic musculature |
|
| Authors: | Daniel L Belavý Joseph K-F Ng Stephen J Wilson Gabriele Armbrecht Dick F Stegeman Jörn Rittweger Dieter Felsenberg Carolyn A Richardson |
| Institution: | 1. KU Leuven Department of Rehabilitation Sciences, Leuven, Belgium;2. Hasselt University, Biomedical Research Institute, Diepenbeek, Belgium;3. KU Leuven Department of Rehabilitation Sciences, Campus Brugge, Bruges, Belgium;4. Department of Physical Medicine and Rehabilitation, University Hospitals Leuven, Leuven, Belgium;5. Department of Neurosurgery, University Hospitals Leuven, Leuven, Belgium;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Beijing 100083, China;2. School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China;1. Department of Physical Therapy and Athletic Training, University of Utah, 520 Wakara Way, Salt Lake City, UT 84018, USA;2. School of Medicine, University of Utah, 30 N. 1900 E, Salt Lake City, UT 84132, USA;3. Department of Nutrition and Metabolism, University of Texas Medical Branch, Galveston, TX 77550, USA;4. Division of Geriatrics, 30 N 1900 E, Room 4B120, University of Utah, Salt Lake City, UT 84132, USA;5. VA Salt Lake City Geriatric Research, Education, and Clinical Center, Salt Lake City, UT 84148, USA;6. Department of Nutrition and Integrative Physiology, University of Utah, 250 S. 1850 E, RM 214, Salt Lake City, UT 84112, USA |
| 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. |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ | |