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首页> 外文期刊>Equine and Comparative Exercise Physiology >Segmented variation in the activity and function of the equine longissimus dorsi muscle during walk and trot
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Segmented variation in the activity and function of the equine longissimus dorsi muscle during walk and trot

机译：步行和小跑时马背最长肌的活动和功能的分段变化

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摘要

Muscle function depends in part on the interplay between its activity and its length within the stretch-shortening cycle. The longissimus dorsi is a large epaxial muscle running along the thoracic and lumbar regions of the equine back. Due to its anatomical positioning, the longissimus dorsi has the capability of contributing to many functions: developing bending moments in the dorsoventral and lateral (coupled to axial rotation) directions and also providing stiffness to limit motion in these directions. We hypothesize that the exact function of the longissimus dorsi will vary along the back and between gaits as the relation between activity and motion of the back changes. Electromyograms (EMG) were recorded at walk (inclined and level) and trot (on the level) on a treadmill from the longissimus dorsi at muscle segments T14, T16, T18 and L2. Back motion was additionally measured using a fibre-optic goniometer. Co-contractions of the muscle between its left and right sides were quantified using correlation analysis. A greater dominance of unilateral activity was found at more cranial segments and for level walking, suggesting a greater role of the longissimus dorsi in developing lateral bending moments. Timing of the EMG varied between muscle segments relative to the gait cycle, the locomotor condition tested and the flexion-extension cycle of the back. This supports the hypothesis that the function of the longissimus dorsi changes along the back and between gaits.
机译：肌肉功能部分取决于其活动性及其在缩短拉紧周期内的长度之间的相互作用。背最长肌是沿着马背的胸部和腰部区域运行的大型外延肌。由于其解剖学定位，背最长肌具有多种功能的能力：在背腹和横向（耦合至轴向旋转）方向产生弯矩，并提供刚度以限制在这些方向上的运动。我们假设背最长肌的确切功能会随着背部和步态之间的变化而变化，因为背部活动和运动之间的关系会发生变化。在来自背最长肌的跑步机上，在肌肉段T14，T16，T18和L2处的步行（倾斜和水平）和小跑（水平）上记录肌电图（EMG）。还使用光纤测角仪测量背向运动。使用相关分析量化了左侧和右侧之间的肌肉共收缩。在更多的颅骨节段和水平行走中发现了更大的单侧活动优势，表明背最长肌在发展侧弯力矩中的作用更大。 EMG的时机在肌肉段之间相对于步态周期，测试的运动状况以及背部的屈伸周期而有所不同。这支持了背最长肌的功能沿背部和步态变化的假设。

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