RELATIONSHIP BETWEEN FORCE LEVEL AND EXERTION STRATEGY IN RAPID ISOMETRIC CNTRACTIONS
RELATIONSHIP BETWEEN FORCE LEVEL AND EXERTION STRATEGY IN RAPID ISOMETRIC CNTRACTIONS
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快速等长收缩中力量水平与用力策略之间的关系
DOI：
10.7600/jspfsm1949.46.289
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发表时间：
1997
影响因子：
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通讯作者：
K. Tanii
中科院分区：
文献类型：
--
作者：
S. Ono;M. Okada;T. Kizuka;K. Tanii
研究了快速等长收缩时相对力量水平与用力策略之间的关系。13名受试者在不同的力水平下尽可能快地进行等长捏举。获得第一骨间背侧肌收缩时的力曲线和表面肌电信号。虽然单峰力曲线在一定的力水平下保持类似，但在更高的力水平下，它们变为多峰曲线。临界力水平，这可以确定在所有科目的相对力水平MVC，是正相关的%MVC EMG幅度为单位时间，低于临界水平。低于临界值时肌电图持续时间明显短于临界值以上。这些结果表明，在不同的力量水平的快速收缩中使用不同的用力策略，并且临界力量水平的个体差异与运动单元激活方式的差异有关。（Jpn. J. Phys. Fitness Sports Med. 1997，46：289·`296）关键词：用力策略、快速收缩、捏、肌电图、临界水平
The relationships were examined between the relative force level and exertion strategy during rapid isometric contractions. Thirteen subjects exerted isometric pinchings as fast as possible at various force levels. Force curves and surface EMGs from the first dorsal interosseous muscle were obtained during the contractions. While the single-peaked force curves remained analogous up to a certain force level, they changed to multi-peaked ones at higher force levels . The critical force level, which could be determined in all subjects as relative force level to MVC , was positively correlated with the %MVC EMG magnitude for unit time, obtained below the critical level . EMG durations were significantly shorter blow than above the critical level . These results suggest that different exertion strategies are utilized in rapid contractions at different force levels , and that individual differences in the critical force level are related to difference in the manner of motor unit activation . (Jpn. J. Phys. Fitness Sports Med. 1997, 46: 289•`296) key words : exertion strategy, rapid contractions, pinching, EMG, critical level