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Abstract：
Eccentric training proved to be effective in hamstring injury prevention; however, little is known about effects of eccentric hamstring training at long muscle length on hamstring flexibility. Hence, the aim was to evaluate the effect of eccentric training at long muscle lengths on flexibility and passive properties of the hamstring muscles. 34 physically active young adults were randomized to either the control or intervention group (6 weeks of eccentric hamstring training at long muscle length; control group resumed with their usual activities). Maximal passive hip flexion range of motion (ROM), passive hamstring stiffness, shear modulus and tendon length of the biceps femoris long head (BFlh) were measured pre- and post-intervention. A significant time × group effect was observed for maximal passive hip ROM. Post-hoc testing revealed a significant increase in the intervention group (+11.2%; p < 0.001; d = 1.55). Additionally, a significant time effect was shown for shear modulus in a relaxed position (p < 0.001). No significant interaction was shown for other parameters. Results indicate that eccentric hamstring training at long muscle length elicits large gains in hamstring flexibility, which are most likely not related to changes in passive hamstring stiffness or BFlh distal tendon length.
摘要：
事实证明，偏心训练在预防腿筋损伤方面是有效的；但是，关于长肌肉长度的偏心腿筋训练对腿筋柔韧性的影响知之甚少。因此，目的是评估长肌肉长度的偏心训练对腿筋肌肉的灵活性和被动特性的影响。34名运动活跃的年轻人被随机分为对照组或干预组（在长肌肉长度下进行6周的偏心腿筋训练；对照组恢复了常规活动）。最大被动髋关节屈曲活动范围(ROM),被动腿筋刚度，在干预前后测量股二头肌长头（BFlh）的剪切模量和肌腱长度。观察到最大被动髋关节ROM的显着时间×组效应。事后测试显示干预组显著增加(+11.2%;p<0.001;d=1.55)。此外,对于松弛位置的剪切模量显示出显著的时间效应(p<0.001)。其他参数没有显示出显著的相互作用。结果表明，在长肌肉长度的偏心腿筋训练会引起腿筋柔韧性的大量增加，这很可能与被动腿筋刚度或BFlh远端肌腱长度的变化无关。
