Interactions between the human gastrocnemius muscle and the Achilles tendon during incline, level and decline locomotion
Interactions between the human gastrocnemius muscle and the Achilles tendon during incline, level and decline locomotion
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DOI：
10.1242/jeb.02434
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发表时间：
2006-11-01
影响因子：
2.8
通讯作者：
Wilson, A. M.
中科院分区：
文献类型：
--
作者：
Lichtwark, G. A.;Wilson, A. M.
肌肉需要在不同的条件下执行或吸收机械功。然而，肌肉这样做的能力取决于其收缩成分和弹性成分之间的相互作用。在本研究中，我们使用超声检查腓肠肌内侧肌束的长度变化沿着与弹性跟腱在不同的倾斜条件下的运动过程中。6名男性参与者在跑步机上以-10%、0%和10%的等级行走（5 km h（-1）），并以0%和10%的等级跑步（10 km h（-1）），同时记录超声、肌电图和运动学。在步行和跑步中，力是等距发展的;然而，倾斜度的增加增加了力发展的肌肉束长度。与步行相比，跑步时肌肉长度较短。在步行和跑步条件下，都记录了大量的跟腱拉伤，这使得肌肉束能够以更有利于发电的速度行动。在所有条件下，正功由肌肉执行。测量结果表明，尽管所需的外部工作发生了变化，但在不同的坡度或速度下，肌肉束的功能几乎没有变化。这可能是双关节肌肉的作用或小腿三头肌其他肌肉之间的负荷分担的结果。
Muscles are required to perform or absorb mechanical work under different conditions. However the ability of a muscle to do this depends on the interaction between its contractile components and its elastic components. In the present study we have used ultrasound to examine the length changes of the gastrocnemius medialis muscle fascicle along with those of the elastic Achilles tendon during locomotion under different incline conditions. Six male participants walked (at 5 km h(-1)) on a treadmill at grades of -10%, 0% and 10% and ran (at 10 km h(-1)) at grades of 0% and 10%, whilst simultaneous ultrasound, electromyography and kinematics were recorded. In both walking and running, force was developed isometrically; however, increases in incline increased the muscle fascicle length at which force was developed. Force was developed at shorter muscle lengths for running when compared to walking. Substantial levels of Achilles tendon strain were recorded in both walking and running conditions, which allowed the muscle fascicles to act at speeds more favourable for power production. In all conditions, positive work was performed by the muscle. The measurements suggest that there is very little change in the function of the muscle fascicles at different slopes or speeds, despite changes in the required external work. This may be a consequence of the role of this biarticular muscle or of the load sharing between the other muscles of the triceps surae.