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首页> 外文期刊>Journal of Biomechanics >Biomechanical characteristics of the eccentric Achilles tendon exercise.
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Biomechanical characteristics of the eccentric Achilles tendon exercise.

机译：离心跟腱运动的生物力学特征。

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BACKGROUND: Eccentric exercise has been shown to provide good short-term clinical results in the treatment of painful mid-portion chronic Achilles tendinopathies. However, the mechanisms behind the positive effects of eccentric rehabilitation regimes are not known, and research into the biomechanics of the exercise may improve our understanding. METHODS: Sixteen healthy subjects performed one-legged full weight bearing ankle plantar and dorsiflexion exercises during which three-dimensional ground reaction forces (GRF), ankle joint kinematics and surface electromyography (EMG) of the lower leg muscles were recorded. Joint kinematics, GRF frequency contents, average EMG amplitudes, and Achilles tendon loads were calculated. FINDINGS: The eccentric movement phase was characterized by a higher GRF frequency content in the 8-12 Hz range, and reduced EMG activity in the lower leg muscles. No differences in Achilles tendon loads were found. INTERPRETATION: This descriptive study demonstrates differences in the movement biomechanics between the eccentric and concentric phases of one-legged full weight bearing ankle dorsal and plantar flexion exercises. In particular, the findings imply that although the tendon loads are similar, the tendon is vibrated at higher frequencies during the eccentric phase than during the concentric phases. This study provides data that may explain the mechanisms behind the effectiveness of eccentric exercises used in the treatment of Achilles tendinopathies.
机译：背景：偏心锻炼已显示在治疗中段疼痛的慢性跟腱炎中可提供良好的短期临床效果。但是，偏心康复机制积极作用的背后机制尚不清楚，对这项运动的生物力学进行研究可能会增进我们的理解。方法：十六名健康受试者进行了单腿负重足踝和背屈运动，记录了小腿肌肉的三维地面反作用力（GRF），踝关节运动学和表面肌电图（EMG）。计算关节运动学，GRF频率含量，平均EMG振幅和跟腱负荷。结果：偏心运动阶段的特征是在8-12 Hz范围内GRF频率较高，而小腿肌肉的EMG活动降低。阿基里斯腱负荷没有发现差异。解释：这项描述性研究证明了单脚负重踝背和足底屈曲运动的偏心阶段和同心阶段在运动生物力学上的差异。特别地，该发现暗示，尽管肌腱载荷相似，但是在偏心阶段，肌腱以比在同心阶段更高的频率振动。这项研究提供的数据可能可以解释在跟腱病治疗中使用偏心锻炼有效性背后的机制。

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