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首页> 外文期刊>Journal of Biomechanics >Human soleus sarcomere lengths measured using in vivo microendoscopy at two ankle flexion angles
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Human soleus sarcomere lengths measured using in vivo microendoscopy at two ankle flexion angles

机译：使用体内微内窥镜在两个脚踝屈曲角度下测量的比目鱼肌肌节长度

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摘要

The forces generated by the soleus muscle play an important role in standing and locomotion. The lengths of the sarcomeres of the soleus affect its force-generating capacity, yet it is unknown how sarcomere lengths in the soleus change as a function of ankle flexion angle. In this study, we used microendoscopy to measure resting sarcomere lengths at 10 degrees plantarflexion and 20 degrees dorsiflexion in 7 healthy individuals. Mean sarcomere lengths at 10 degrees plantarflexion were 2.84 +/- 0.09 mu m (mean +/- S.E.M.), near the optimal length for sarcomere force generation. Sarcomere lengths were 3.43 +/- 0.09 mu m at 20 degrees dorsiflexion, indicating that they were longer than optimal length when the ankle was in dorsiflexion and the muscle was inactive. Our results indicate a smaller sarcomere length difference between two ankle flexion angles compared to estimates from musculoskeletal models and suggest why these models frequently underestimate the force-generating capacity of the soleus. (C) 2016 Elsevier Ltd. All rights reserved.
机译：比目鱼肌产生的力在站立和运动中起重要作用。比目鱼肌肉瘤的长度会影响其产生力的能力，但是还不知道比目鱼肌肌瘤的长度是如何随踝屈曲角度而变化的。在这项研究中，我们使用显微内窥镜在7位健康个体中测量了足底屈曲10度和背屈20度时的肌节长度。足底屈曲10度时的平均肌节长度为2.84 +/- 0.09微米（平均+/- S.E.M.），接近产生肌节力的最佳长度。在20度背屈时肌节长度为3.43 +/- 0.09微米，表明当踝关节背屈且肌肉不活动时，肌节长度比最佳长度更长。我们的结果表明，与来自肌肉骨骼模型的估算值相比，两个踝关节屈曲角度之间的肌节长度差异更小，并说明了为什么这些模型经常低估比目鱼肌的力量产生能力。 （C）2016 Elsevier Ltd.保留所有权利。

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