Stiffness, intralimb coordination, and joint modulation during a continuous vertical jump test
Stiffness, intralimb coordination, and joint modulation during a continuous vertical jump test
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DOI：
10.1080/14763141.2013.769619
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发表时间：
2013-09-01
影响因子：
2.2
通讯作者：
Dos Santos, Saray Giovana
中科院分区：
文献类型：
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作者：
Dal Pupo, Juliano;Dias, Jonathan Ache;Dos Santos, Saray Giovana
本研究分析了在30秒垂直跳跃测试中跳跃性能、垂直刚度以及关节和肢体内协调的调制。20名男运动员在进行运动学分析的同时在测力板上进行测试。分析跳跃高度、力量输出、触地时间、垂直刚度、最大膝关节和髋关节屈曲角度以及连续相对相位（CRP）协调性。方差分析用于比较十分位数内的变量，t检验用于比较初始和最终跳跃之间的CRP数据。结果表明，跳跃高度，功率输出和垂直刚度减少，在测试过程中发现的接触时间增加。最大膝关节和髋关节屈曲角度下降，但髋关节角度下降（测试的10-20%）早于膝关节角度（90-100%）。当比较初始和最终跳跃时，没有观察到大腿-大腿耦合的CRP变化，但是躯干-大腿耦合在接近测试结束时更加同相。我们得出结论，疲劳导致跳跃性能降低，以及刚度和关节角度的变化。此外，肢体内协调的变化出现在测试的最后10%，这表明神经运动机制可以抵消肌肉力量的损失。
This study analysed the modulation of jump performance, vertical stiffness as well as joint and intralimb coordination throughout a 30-s vertical jump test. Twenty male athletes performed the test on a force plate while undergoing kinematic analysis. Jump height, power output, ground contact time, vertical stiffness, maximum knee and hip flexion angles, and coordination by continuous relative phase (CRP) were analysed. Analysis of variance was used to compare variables within deciles, and t-tests were used to compare CRP data between the initial and final jumps. Results showed reduction in jump height, power output, and vertical stiffness, with an increase in contact time found during the test. Maximum knee and hip flexion angles declined, but hip angle decreased earlier (10-20% of the test) than knee angle (90-100%). No changes were observed in CRP for thigh-leg coupling when comparing initial and final jumps, but the trunk-thigh coupling was more in-phase near the end of the test. We conclude that fatigue causes reduction in jump performance, as well as changes in stiffness and joint angles. Furthermore, changes in intralimb coordination appear at the last 10% of the test, suggesting a neuromotor mechanism to counterbalance the loss of muscle strength.