PRE-STRETCH POTENTIATION OF HUMAN SKELETAL-MUSCLE DURING BALLISTIC MOVEMENT
PRE-STRETCH POTENTIATION OF HUMAN SKELETAL-MUSCLE DURING BALLISTIC MOVEMENT
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DOI：
10.1111/j.1748-1716.1981.tb06716.x
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发表时间：
1981-01-01
期刊：
影响因子：
--
通讯作者：
ITO, A
中科院分区：
文献类型：
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作者：
BOSCO, C;KOMI, PV;ITO, A
从预拉伸到缩短过渡之前和期间的相关条件可能对肌肉的最终表现有相当大的影响。身体状况良好的男性受试者在有预反动作和无预反动作的情况下在力台上进行垂直跳跃。在反动作跳跃（CMJ）中，膝关节弯曲幅度、预拉伸速度和预拉伸结束时所获得的力是主要的研究参数。此外，从角位移和反力曲线上记录了从偏心（预拉伸）相位到同心相位过渡的耦合时间。在最后的计算中，总是将CMJ的力学性能参数与不进行反运动的跳跃进行比较。CMJ可使平均同心力和平均机械功率分别提高423 N（66%）和1158 W（81%）。预拉伸结束时力越大，增强效应越明显（P < 0.001）。同样，预拉伸速度（P < 0.001）和短耦合时间（P < 0.01）与同心相位的性能增强相关。平均耦合时间为23 ms。通过改变预拉伸条件来改变肌动球蛋白的过桥形成，使弹性能的储存和利用与高预拉伸速度、高偏心力和短耦合时间有关。反射增强的作用也被认为是对最终表现的额外增强。
The conditions associated prior to and during the transition from prestretch to shortening may have a considerable influence on the final performance of muscle. Male subjects of good physical condition performed vertical jumps on the force-platform with and without preliminary counter movement. In the counter movement jump (CMJ) the amplitude of the knee bending, velocity of the prestretch and the force attained at end of prestretch were the primary parameters of interest. In addition the coupling time indicating the transition from the eccentric (prestretch) phase to the concentric phase was recorded from the angular displacement and reaction force curves. In the final calculation the mechanical performance parameters of CMJ were always compared with those of the jumps performed without counter movement. CMJ probably enhanced the average concentric force and average mechanical power by 423 N (66%) and 1158 W (81%), respectively. This potentiation effect was higher with a higher force at end of prestretch (P < 0.001). Similarly, the prestretch speed (P < 0.001) and short coupling time (P < 0.01) were associated with enhanced performance during the concentric phase. The average coupling time was 23 ms. The results are interpreted through changes in the prestretch conditions to modify the actomyosin cross-bridge formation so that the storage and utilization of elastic energy is associated with high prestretch speed, high eccentric force and short coupling time. The role of the reflex potentiation is also suggested as additional enhancement of the final performance.