Determinants of difference in leg stiffness between endurance- and power-trained athletes
Determinants of difference in leg stiffness between endurance- and power-trained athletes
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DOI：
10.1016/j.jbiomech.2007.10.014
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发表时间：
2008-01-01
影响因子：
2.4
通讯作者：
Kanosue, Kazuyuki
中科院分区：
文献类型：
--
作者：
Hobara, Hiroaki;Kimura, Kozo;Kanosue, Kazuyuki
了解人类运动过程中腿部和关节的僵硬度将提供重要的信息，可用于评估运动表现和预防伤害。在本研究中，我们研究了耐力训练和力量训练的运动员之间的腿刚度差异的决定因素。七名长跑运动员和七名经过力量训练的运动员进行原地跳跃，与3.0和1.5 Hz的节拍器节拍相匹配。腿部和关节刚度计算动力学和运动学数据。记录6块腿部肌肉的肌电图活动（EMG）。在两种跳跃频率下，力量训练的运动员表现出比长跑运动员更高的腿部刚度。分析髋关节、膝关节和踝关节的刚度和触地角度。力量训练的运动员在3.0 Hz时的踝关节僵硬度显著高于长跑运动员，1.5 Hz时的膝关节僵硬度也是如此。在任一跳频下，DR组和PT组之间的触地角度无显著差异。当两组运动员的肌电活动存在显著性差异时，中长跑运动员的肌电活动总是大于力量训练运动员。这些结果表明，（1）耐力训练和力量训练运动员之间腿部僵硬度的差异最好归因于关节僵硬度的增加，（2）两组之间关节僵硬度的差异可能归因于肌肉-肌腱复合体的内在僵硬度缺乏相似性，而不是神经活动的改变。(c)2007爱思唯尔有限公司保留所有权利。
Understanding the leg and joint stiffness during human movement would provide important information that could be utilized for evaluating sports performance and for injury prevention. In the present study, we examined the determinants of the difference in the leg stiffness between the endurance- trained and power-trained athletes. Seven distance runners and seven power-trained athletes performed in-place hopping, matching metronome beats at 3.0 and 1.5 Hz. Leg and joint stiffness were calculated from kinetic and kinematics data. Electromyographic activity (EMG) was recorded from six leg muscles. At both hopping frequencies, the power-trained athletes demonstrated significantly higher leg stiffness than the distance runners. Hip, knee, and ankle joints were analyzed for stiffness and touchdown angles. Ankle stiffness was significantly greater in the power-trained athletes than the distance runners at 3.0 Hz as was knee stiffness at 1.5 Hz. There was no significant difference in touchdown angle between the DR and PT groups at either hopping frequencies. When significant difference in EMG activity existed between two groups, it was always greater in the distance runners than the power-rained athletes. These results suggest that (1) the difference in leg stiffness between endurance-trained and power-trained athletes is best attributed to increased joint stiffness, and (2) the difference in joint stiffness between the two groups may be attributed to a lack of similarity in the intrinsic stiffness of the muscle-tendon complex rather than in altered neural activity. (c) 2007 Elsevier Ltd. All rights reserved.