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首页> 外文期刊>Medicine and science in sports and exercise >Effects of fatigue of plantarflexors on control and performance in vertical jumping.
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Effects of fatigue of plantarflexors on control and performance in vertical jumping.

机译：ar屈疲劳对垂直跳的控制和性能的影响。

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INTRODUCTION: We investigated the effects of a mismatch between control and musculoskeletal properties on performance in vertical jumping. METHODS: Six subjects performed maximum-effort vertical squat jumps before (REF) and after the plantarflexors of the right leg had been fatigued (FAT) while kinematic data, ground reaction forces, and EMG of leg muscles were collected. Inverse dynamics was used to calculate the net work at joints, and EMG was rectified and smoothed to obtain the smoothed rectified EMG (SREMG). The jumps of the subjects were also simulated with a musculoskeletal model comprising seven body segments and 12 Hill-type muscles, and having as only input muscle stimulation. RESULTS: Jump height was approximately 6 cm less in FAT jumps than in REF jumps. In FAT jumps, peak SREMG level was reduced by more than 35% in the right plantarflexors and by approximately 20% in the right hamstrings but not in any other muscles. In FAT jumps, the net joint work was reduced not only at the right ankle (by 70%) but also at the right hip (by 40%). Because the right hip was not spanned by fatigued muscles and the reduction in SREMG of the right hamstrings was relatively small, this indicated that the reduction in performance was partly due to a mismatch between control and musculoskeletal properties. The differences between REF and FAT jumps of the subjects were confirmed and explained by the simulation model. Reoptimization of control for the FAT model caused performance to be partly restored by approximately 2.5 cm. CONCLUSION: The reduction in performance in FAT jumps was partly due to a mismatch between control and musculoskeletal properties.
机译：简介：我们研究了控制和肌肉骨骼特性之间不匹配对垂直跳跃性能的影响。方法：六名受试者在右腿the屈疲劳（FAT）之前（REF）和之后进行最大努力垂直下蹲跳动（FAT），同时收集了腿部肌肉的运动学数据，地面反作用力和EMG。使用逆动力学来计算接头处的净功，并对EMG进行校正和平滑以获得平滑的整流EMG（SREMG）。还使用包括七个身体段和12个Hill型肌肉并且仅具有输入肌肉刺激的肌肉骨骼模型来模拟受试者的跳跃。结果：FAT跳跃的跳跃高度比REF跳跃的跳跃高度低约6 cm。在FAT跳跃中，右侧plant屈肌的SREMG峰值水平降低了35％以上，右侧绳肌的峰值SREMG水平降低了约20％，但其他任何肌肉均未降低。在FAT跳跃中，净关节功不仅在右脚踝处减少了70％，而且在右臀部处减少了40％。因为右臀部没有被疲劳的肌肉所覆盖，并且右腿筋的SREMG降低相对较小，所以这表明性能的降低部分是由于对照和肌肉骨骼特性之间的不匹配所致。仿真模型确认并解释了受试者的REF和FAT跳跃之间的差异。 FAT模型控制的重新优化导致性能大约恢复了2.5厘米。结论：FAT跳跃表现的下降部分是由于对照和肌肉骨骼特性之间的不匹配。

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