Muscle-tendon interaction and EMG profiles of world class endurance runners during hopping
Muscle-tendon interaction and EMG profiles of world class endurance runners during hopping
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DOI：
10.1007/s00421-012-2559-6
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发表时间：
2013-06-01
影响因子：
3
通讯作者：
Komi, P. V.
中科院分区：
文献类型：
--
作者：
Sano, K.;Ishikawa, M.;Komi, P. V.
本研究检查了十名国际级肯尼亚跑步运动员的肌肉与肌腱的相互作用。在以最大水平进行重复跳跃期间，将超声检查和运动学与下肢肌肉的肌电图记录一起应用。与身高匹配的 10 名对照受试者相比，这 10 名肯尼亚人在休息时的胃跟腱更长 (p < 0.01)。相反，在跳跃的接触阶段，肯尼亚人腓肠肌内侧（MG）肌腱组织的拉伸和缩短幅度明显小于对照组。这也适用于束长度的变化，肯尼亚人的束长度变化更小且更均匀。尽管体重减轻，但这些有限的肌肉肌腱变化导致了更高的最大跳跃高度和更大的力量。接触过程中 MG 肌腱组织更大的缩短与拉伸比的相关发现可能意味着肯尼亚 MG 肌腱单元经过优化，有利于弹性能量的有效存储和反冲，同时在最佳肌肉束工作范围（平台区域）下运行。
The present study examined the muscle-tendon interaction of ten international level Kenyan runners. Ultrasonography and kinematics were applied together with EMG recordings of lower limb muscles during repetitive hopping performed at maximal level. The ten Kenyans had longer gastro Achilles tendon at rest (p < 0.01) as compared with ten control subjects matched in height. Conversely, the stretching and shortening amplitudes of the tendinous tissues of the medial gastrocnemius (MG) muscle were significantly smaller in the Kenyans than in controls during the contact phase of hopping. This applied also to the fascicle length changes, which were smaller and more homogeneous among Kenyans. These limited musculo-tendinous changes resulted in higher maximal hopping height and in larger power despite their reduced body weight. The associated finding of a greater shortening to stretching ratio of the MG tendinous tissues during contact could imply that the Kenyan MG muscle-tendon unit is optimized to favor efficient storage and recoil of elastic energy, while operating at optimal muscle fascicle working range (plateau region).