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首页> 外文期刊>Journal of Biomechanics >Adaptation to sudden unexpected loading of the low back-the effects of repeated trials
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Adaptation to sudden unexpected loading of the low back-the effects of repeated trials

机译：适应突然下腰的意外负荷-反复试验的效果

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The purpose of this study was to investigate short-term changes in reactions to sudden unexpected loading of the low back. The study utilized a set-up where a horizontal force of 58 N pointing forward suddenly was applied to the upper part of the subject's trunk. EMG activity from the erector spinae muscles and trunk movement data were recorded during 10 trials for 19 subjects. The analysis included EMG reaction time, mean rectified EMG amplitude during the period 50-250ms after the sudden loading, and time elapsed until stopping of the forward movement of the trunk (stopping time). Reaction time means ranged from 66 to 97ms (79 +/- 9 ins), and no difference was found between the trials. Conversely, the mean stopping time for the first trial (468 ms) was significantly higher than for trials 3-10 (359-371 ms), and the average EMG amplitude during the period 50-250 ms after the sudden loading was lower for the first trial. This study showed that some subjects adapted to sudden unexpected loadings of the low back through a reduction in stopping time and a progression in EMG response during the first few trials. This possible adaptation to repeated trials have been overlooked in previous studies. (C) 2004 Elsevier Ltd. All rights reserved.
机译：这项研究的目的是调查对腰部突然意外负荷的反应的短期变化。这项研究利用了一种装置，其中向受试者的躯干上部突然施加了58 N的水平力。在19个受试者的10个试验中，记录了来自竖脊肌的EMG活动和躯干运动数据。分析包括EMG反应时间，突然加载后50-250ms期间的平均整流EMG振幅以及直到躯干向前运动停止为止的时间（停止时间）。反应时间平均值为66到97毫秒（79 +/- 9英寸），两次试验之间没有发现差异。相反，首次试验的平均停止时间（468 ms）显着高于试验3-10（359-371 ms），并且突然加载后50-250 ms期间的平均EMG振幅较低。初审。这项研究表明，一些受试者在前几次试验中通过减少停止时间和EMG反应进展，适应了突然的腰背意外负荷。在以前的研究中，这种可能适用于重复试验的方法被忽略了。 （C）2004 Elsevier Ltd.保留所有权利。

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