Electromyography-based analysis of human upper limbs during 45-day head-down bed-rest
Electromyography-based analysis of human upper limbs during 45-day head-down bed-rest
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基于肌电图的人体上肢45天低头卧床休息期间的肌电分析
DOI：
10.1016/j.actaastro.2015.12.007
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发表时间：
2016-03-01
影响因子：
3.5
通讯作者：
Ming, Dong
中科院分区：
文献类型：
--
作者：
Fu, Anshuang;Wang, Chunhui;Ming, Dong
肌肉适应不良是对模拟或实际微重力的反应。在太空飞行中，宇航员就像猴子一样，主要用上肢控制操作系统，完成相应的任务。上肢运动能力的变化将直接影响航天员的工作绩效。研究了长时间模拟微重力条件下表面肌电的变化趋势。参与这项研究的8名健康男性进行了严格的45天头低位卧床休息（HDBR）。分别于预卧床第5天、卧床第15、30、45天进行最大推、最大拉运动，同步采集上肢表面肌电。比较了这两项任务中每个受试者的最大志愿收缩，没有显示出显著变化。然而，通过基于sEMG的分析检测到变化。结果发现，与HDBR前相比，HDBR前的综合肌电图、均方根、平均频率、三角肌模糊熵和肱三头肌模糊熵发生了显著变化。其变化趋势在显著下降后呈现恢复趋势，这与以往研究所证实的下肢的单调变化不一致。结果表明，长时间模拟失重时上肢肌电发生变化，但变化趋势与下肢不同。(C)2015年IAA。由爱思唯尔有限公司出版。保留所有权利。
Muscle deconditioning occurs in response to simulated or actual microgravity. In space-flight, astronauts become monkey-like for mainly using their upper limbs to control the operating system and to complete corresponding tasks. The changes of upper limbs' athletic ability will directly affect astronauts' working performance. This study investigated the variation trend of surface electromyography (sEMG) during prolonged simulated microgravity. Eight healthy males participating in this study performed strict 45-day head-down bed-rest (HDBR). On the 5th day of pre-HDBR, and the 15th, the 30th and the 45th days of HDBR, the subjects performed maximum pushing task and maximum pulling task, and sEMG was collected from upper limbs synchronously. Each subject's maximum volunteer contractions of both the tasks during these days were compared, showing no significant change. However, changes were detected by sEMG-based analysis. It was found that integrated EMG, root mean square, mean frequency, fuzzy entropy of deltoid, and fuzzy entropy of triceps brachii changed significantly when comparing pre-HDBR with HDBR. The variation trend showed a recovery tendency after significant decline, which is inconsistent with the monotonic variation of lower limbs that was proved by previous research. These findings suggest that EMG changes in upper limbs during prolonged simulated microgravity, but has different variation trend from lower limbs. (C) 2015 IAA. Published by Elsevier Ltd. All rights reserved.