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首页> 外文期刊>Journal of Sports Science and Medicine >Relationship between Achilles Tendon Stiffness and Ground Contact Time during Drop Jumps
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Relationship between Achilles Tendon Stiffness and Ground Contact Time during Drop Jumps

机译：突跳过程中跟腱刚度与地面接触时间的关系

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The purpose of this study was to investigate the relationship between Achilles tendon stiffness and ground contact time (GCT) during drop jumps. The property of “springiness” and a short GCT during the movement is required in several types of sports. Therefore, a stiff tendon might be advantageous due to the quick force transmission from the muscle to the bone. Hence, a secondary aim was to relate Achilles tendon stiffness with squat jump (SJ) and counter movement jump (CMJ) performance, respectively. Nineteen physically active healthy males (mean ± SD: 26.7 ± 3.9 years, 1.77 ± 0.07 m, 76.5 ± 6.7 kg) participated in this study. Subjects were asked to perform squat jumps and counter movement jumps to determine jump height, and drop jumps were undertaken on a force plate to determine GCT. We then simultaneously measured isometric maximum voluntary contraction (MVIC) of the plantar flexors with a dynamometer and recorded the elongation of the tendon with ultrasound; hence, we could calculate tendon stiffness. The results show a correlation between GCT and Achilles tendon stiffness (r = -0.50) and MVIC (r = -0.48), respectively. Achilles tendon stiffness was not significantly correlated with squat jump and counter movement jump height, respectively. According to the results, we can confirm the main hypothesis that a stiff Achilles tendon tends to result in a shorter GCT during drop jumps. However, Achilles tendon stiffness does not appear to be a key determinant in jumping performance.
机译：这项研究的目的是调查在跳跳过程中跟腱刚度与地面接触时间（GCT）之间的关系。几种类型的运动都要求具有“弹性”和在运动过程中短GCT的特性。因此，由于从肌肉到骨骼的快速力传递，刚性肌腱可能是有利的。因此，第二个目的是将跟腱僵硬度分别与下蹲跳动作（SJ）和反向运动跳动作（CMJ）进行关联。 19名身体活跃的健康男性（平均±SD：26.7±3.9岁，1.77±0.07 m，76.5±6.7 kg）参加了这项研究。要求受试者进行深蹲跳跃和反动作跳跃以确定跳跃高度，并在测力板上进行下降跳跃以确定GCT。然后，我们用测力计同时测量足底屈肌的等距最大自发收缩（MVIC），并用超声记录肌腱的伸长。因此，我们可以计算肌腱刚度。结果表明，GCT与跟腱僵硬度（r = -0.50）和MVIC（r = -0.48）之间分别具有相关性。跟腱僵硬度与下蹲跳高和反向运动跳高没有显着相关。根据结果​​，我们可以证实主要假说，即在跟跳过程中，跟腱僵硬往往会导致GCT缩短。但是，跟腱僵硬似乎并不是跳跃性能的关键决定因素。

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