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首页> 外文期刊>Journal of Biomechanics >Characterization of muscle belly elastic properties during passive stretching using transient elastography.
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Characterization of muscle belly elastic properties during passive stretching using transient elastography.

机译：使用瞬态弹性成像在被动拉伸过程中表征肌肉腹部的弹性。

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Passive muscle stretching can be used in vivo to assess the viscoelastic properties of the entire musculo-articular complex, but does not allow the specific determination of the muscle or tendon viscoelasticity. In this respect, the local muscle hardness (LMH) of the gastrocnemius medialis (GM) belly was measured during a passive ankle stretching of 10 subjects using transient elastography. A Biodex isokinetic dynamometer was used to stretch ankle plantar flexors, to measure ankle angle, and the passive torque developed by the ankle joint in resistance to the stretch. Results show that the LMH increased during the stretching protocol, with an averaged ratio between maximal LMH and minimal LMH of 2.62+/-0.46. Furthermore, LMH-passive torque relationships were nicely fitted using a linear model with mean correlation coefficients (R(2)) of 0.828+/-0.099. A good reproducibility was found for the maximal passive torque (ICC=0.976, SEM=2.9Nm, CV=5.5%) and the y-intercept of the LMH-passive torque relationship (ICC=0.893, SEM=105Pa, CV=7.8%). However, the reproducibility was low for the slope of this relationship (ICC=0.631, SEM=10.35m(-2), CV=60.4%). The y-intercept of the LMH-passive torque relationship was not significantly changed after 10min of static stretching. This result confirms the finding of a previous study indicating that changes in passive torque following static stretching could be explained by an acute increase in muscle length without any changes in musculo-articular intrinsic mechanical properties.
机译：被动肌肉拉伸可用于体内评估整个肌肉-关节复合物的粘弹性质，但不能具体确定肌肉或肌腱的粘弹性。在这方面，使用瞬态弹性成像技术在10名受试者的被动脚踝拉伸过程中测量了腓肠肌（GM）腹部的局部肌肉硬度（LMH）。使用Biodex等速测力计拉伸踝plant屈，测量踝角，以及踝关节在抵抗拉伸时产生的被动扭矩。结果表明，LMH在拉伸方案中增加，最大LMH与最小LMH之间的平均比率为2.62 +/- 0.46。此外，LMH被动扭矩关系使用线性模型进行了很好的拟合，平均相关系数（R（2））为0.828 +/- 0.099。对于最大被动扭矩（ICC = 0.976，SEM = 2.9Nm，CV = 5.5％）和y截距，LMH被动扭矩关系（ICC = 0.893，SEM = 105Pa，CV = 7.8％）具有良好的重现性）。但是，这种关系的斜率的可重复性较低（ICC = 0.631，SEM = 10.35m（-2），CV = 60.4％）。静态拉伸10分钟后，LMH被动扭矩关系的y截距没有显着变化。该结果证实了先前研究的发现，该研究表明静态拉伸后被动扭矩的变化可以解释为肌肉长度的急剧增加而肌肉-关节固有机械特性没有任何变化。

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