Muscle Stiffness of the Vastus Lateralis in Sprinters and Long-Distance Runners
Muscle Stiffness of the Vastus Lateralis in Sprinters and Long-Distance Runners
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DOI：
10.1249/mss.0000000000002024
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发表时间：
2019-10-01
期刊：
影响因子：
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通讯作者：
Hashimoto, Takeshi
中科院分区：
文献类型：
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作者：
Miyamoto, Naokazu;Hirata, Kosuke;Hashimoto, Takeshi
目的 肌肉肌腱单位和小腿肌腱的硬度在短跑和长跑中起着重要作用。然而，肌肉僵硬与短跑和跑步的关系仍然未知。本研究旨在确定短跑运动员和长跑运动员的肌肉僵硬特征，并确定肌肉僵硬与这些运动员的表现之间的关系。方法 使用超声剪切波弹性成像技术，在 22 名男性短跑运动员（SPR 组）、22 名男性长跑运动员（LDR 组）和 19 名未经训练的健康对照男性受试者（CON 组）中，测量被动（静息）和主动（以最大自主收缩的 50% 收缩膝关节伸肌）条件下股外侧肌（VL）的肌肉剪切波速度（代表刚度）。结果SPR组被动VL剪切波速显着低于LDR组（P=0.039）。 LDR组主动VL剪切波速度显着高于SPR组（P=0.022）和CON组（P<0.001）。在SPR组中，100米比赛时间与被动VL剪切波速度呈负相关（r=-0.483，P=0.023），与主动VL剪切波速度正相关（r=0.522，P=0.013）。在LDR组中，5000米比赛时间与被动VL剪切波速度呈正相关（r = 0.438，P = 0.047），但与主动VL剪切波速度无关。结论 短跑运动员和长跑运动员的肌肉表现出特征性的僵硬，这有利于他们的运动表现。根据运动速度，被动和主动肌肉僵硬可能在人体运动中发挥不同的作用。
Purpose The stiffness of muscle-tendon units and of tendons in the lower legs plays important roles in sprinting and long-distance running. However, the association of muscle stiffness with sprinting and running remains unknown. This study aimed to identify the characteristics of muscle stiffness in sprinters and long-distance runners, and to determine how muscle stiffness is related to the performance of these athletes. Methods In 22 male sprinters (SPR group), 22 male long-distance runners (LDR group), and 19 healthy untrained control male subjects (CON group), the muscle shear wave speed (a proxy for stiffness) of the vastus lateralis (VL) was measured under passive (resting) and active (contracting the knee extensors at 50% of maximal voluntary contraction) conditions, by using ultrasound shear wave elastography. Results The passive VL shear wave speed in SPR group was significantly lower than that in LDR group (P = 0.039). The active VL shear wave speed in LDR group was significantly higher than that in SPR (P = 0.022) and CON (P < 0.001) groups. In SPR group, the 100-m race time was negatively correlated to the passive VL shear wave speed (r = -0.483, P = 0.023) and positively correlated to the active VL shear wave speed (r = 0.522, P = 0.013). In the LDR group, the 5000-m race time was positively correlated to the passive VL shear wave speed (r = 0.438, P = 0.047) but not to the active VL shear wave speed. Conclusion The muscles of sprinters and long-distance runners exhibit characteristic stiffness that can be beneficial to their athletic performance. Passive and active muscle stiffness may play different roles in human locomotion, depending on locomotion speeds.