Short term bed-rest reduces conduction velocity of individual motor units in leg muscles |
| |
| Authors: | Corrado Cescon Marco Gazzoni |
| |
| Institution: | 1. Department of Neurology, Medical University of Warsaw, Banacha 1A st, 02-097 Warsaw, Poland;2. Department of Engineering of Nervous and Muscular System, Na??cz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Ks. Trojdena 4 st., 02-109 Warsaw, Poland;1. Na??cz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland;2. Department of Neurology, Medical University of Warsaw, Poland;3. Neuromuscular Unit, Mossakowski Medical Research Centre, Polish Academy of Sciences, Warsaw, Poland;1. Laboratory of Veterinary Anatomy and Cell Biology, Faculty of Agriculture, Iwate University, 18-8, Ueda 3-chome, Morioka, Iwate 020-8550, Japan;2. Department of Basic Veterinary Science, United Graduate School of Veterinary Science, Gifu University, 1-1, Yanagido, Gifu 501-1193, Japan;1. Infineon Technologies AG, 93049 Regensburg, Germany;2. IEETA, DETI, Universidade de Aveiro, P-3810-193 Aveiro, Portugal;3. DATC/ESTII, Universidad de Granada, E-18071 Granada, Spain;4. CIML Group, Biophysics Department, University of Regensburg, D-93040 Regensburg, Germany |
| |
| Abstract: | Space permanence simulations such as prolonged bed-rest can mimic some of the physiological modifications in the human body and provide study conditions that are more accessible than during space flight. A short term bed-rest experiment was organized to simulate the effects of weightlessness for studying the adaptation to this condition. Eight healthy young volunteers were studied before and immediately after the 14 day periods of strict bed-rest.Surface EMG signals were detected with linear electrode arrays from vastus medialis, vastus lateralis and tibialis anterior muscle during isometric voluntary contractions at 20% MVC. Motor unit action potentials (MUAPs) of individual motor units were extracted from the interference EMG signals with a partial decomposition algorithm and averaged.MUAP templates generated by the same motor unit could be retrieved before and after bed-rest period. Muscle fiber conduction velocity (CV) was estimated from each averaged MUAP template and from the global EMG signal. Both global and single MU conduction velocity was observed to decrease by about 10% after the bed-rest period (p < 0.05). Amplitude and power spectral parameters did not significantly change after the bed-rest period.It is concluded that a short term bed-rest reduces the CV of individual motor units without a significant effect on muscle force or on other electrophysiological parameters. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
