Assessment of muscle fatigue in low level monotonous task performance during car driving
Assessment of muscle fatigue in low level monotonous task performance during car driving
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DOI：
10.1016/j.jelekin.2004.08.002
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发表时间：
2005-06-01
影响因子：
2.5
通讯作者：
Ramon, H
中科院分区：
文献类型：
--
作者：
Hostens, I;Ramon, H
肌肉激活和肌肉疲劳的发展的知识可以提供更多的内部在长期驾驶的影响在颈部/肩部/背部区域的健康问题的发生。使用肌电图（EMG）进行疲劳检测的基本假设是EMG振幅增加和平均频率（MF）降低。本研究旨在验证这一假设在单调的任务性能与低水平的活动，在汽车驾驶。在重复的、非连续的驾驶任务（齿轮和转向）期间，从左、右腓肠肌和三角肌捕获表面肌电图，并将活动部分与非活动部分分离。超过一半的受试者在1小时的驾驶后报告了肌肉僵硬。仅在活性部件中观察到MF显著降低。但肌电振幅也明显下降。在文献中公布了这一发现的两种可能机制：没有额外的运动单位（MU）和增强肌纤维。文献还假设，低强度的职业工作只涉及一小部分的MU可用于招聘，这些单位是选择性的I型肌纤维（灰姑娘纤维）。这一现象的始作俑者可能是激活与驾驶和振动暴露的压力之间的时间滞后。(c)2004爱思唯尔有限公司保留所有权利。
Knowledge of the muscle activation and the development of muscle fatigue may provide more inside in the effects of long-term driving in the occurrence of health problems in the neck/shoulder/back area. The basic assumption behind fatigue detection with electromyography (EMG) is an increase in the EMG amplitude and a decrease of the mean frequency (MF). This study aimed at checking this assumption in monotonous task performance with low level activity during car driving. Surface electromyography was captured from left and right trapezius and deltoid muscles, during a repetitive, non-continuous, driving task (gearing and steering) and the active parts were separated from the non-active parts. Muscle stiffness was reported by more than half of the subjects after a 1 h drive. Only for the active parts a significant decrease of the MF was seen. But also the EMG amplitude decreased significantly. Two possible mechanisms are posted in literature for this finding: no extra recruitment of motor units (MU) and potentiation of muscle fibers. Literature also hypothesizes that low-force occupational work engages only a fraction of the MU available for recruitment and that these units are selectively type I muscle fibers (Cinderella fibers). Initiators of this phenomenon are probably the time lag between activations and the stress from driving and vibration exposure. (c) 2004 Elsevier Ltd. All rights reserved.