Serial isometric contractions under imposed myotatic stretch conditions in high-strength and low-strength men
Serial isometric contractions under imposed myotatic stretch conditions in high-strength and low-strength men
复制标题
高强度和低强度男性在强加的肌张力拉伸条件下的连续等长收缩
DOI：
10.1007/bf00421654
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发表时间：
1979
期刊：
影响因子：
--
通讯作者：
G. Kamen
中科院分区：
文献类型：
--
作者：
G. Kamen
在12名高强度和12名低强度男性中，研究了强加的肌强直拉伸对膝关节伸肌力的直接影响。在非疲劳的运动前条件下，由于施加拉伸，观察到高强度组的张力显著增加6.5%，低强度组的张力显著增加11.0%。运动治疗包括28次连续等长收缩，每次持续5秒，间歇休息10秒。这种疲劳运动导致高强度组和低强度组的强度分别显著下降28.0%和18.5%。类似的治疗包括在每次试验中施加1 s的肌强直拉伸，结果低强度组的力量下降（26.4%）比高强度组的力量下降（15.0%）更大。在等距运动条件下，高强度受试者比低强度受试者疲劳更快，而低强度受试者在强制拉伸的等距运动条件下比高强度受试者疲劳更快，这一现象的神经因素被初步认为是一种合理的解释。
The immediate effects of an imposed myotatic stretch on knee extensor force were studied in 12 high-strength and 12 low-strength men. Under nonfatigued pre-exercise conditions, significant tension increases of 6.5% for the high-strength group and 11.0% for low-strength subjects were observed as a result of the imposed stretch. An exercise treatment involving 28 serial isometric contractions, each of 5 s duration, with an intertrial rest period of 10 s was administered. This fatiguing exercise resulted in significant decrements in strength on the order of 28.0% and 18.5% for the high-strength and low-strength groups, respectively. A similar treatment which included a 1 s imposed myotatic stretch during each trial resulted in a greater strength decrement for the lowstrength group (26.4%) than for the high-strength subjects (15.0%). A neural factor involving the stretch reflex is tentatively suggested as a plausible explanation accounting for the observation that high-strength subjects fatigue faster than low-strength subjects under conditions of isometric exercise, while lowstrength subjects fatigue faster than high-strength individuals in isometric exercise which is performed with an imposed stretch.