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首页> 外文期刊>Journal of athletic training >Influence of hip-flexion angle on hamstrings isokinetic activity in sprinters
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Influence of hip-flexion angle on hamstrings isokinetic activity in sprinters

机译：髋关节屈曲角度对短跑运动员绳肌等速运动的影响

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Context: Hamstrings strains are common and debilitating injuries in many sports. Most hamstrings exercises are performed at an inadequately low hip-flexion angle because this angle surpasses 70° at the end of the sprinting leg's swing phase, when most injuries occur. Objective: To evaluate the influence of various hip-flexion angles on peak torques of knee flexors in isometric, concentric, and eccentric contractions and on the hamstrings-to-quadriceps ratio. Design: Descriptive laboratory study. Setting: Research laboratory. Patients and Other Participants: Ten national-level sprinters (5 men, 5 women; age=21.2 ± 3.6 years, height=175 ± 6 cm, mass = 63.8 ± 9.9 kg). Intervention(s): For each hip position (0°, 30°, 60°, and 908 of flexion), participants used the right leg to perform (1) 5 seconds of maximal isometric hamstrings contraction at 458 of knee flexion, (2) 5 maximal concentric knee flexion-extensions at 608 per second, (3) 5 maximal eccentric knee flexion-extensions at 608 per second, and (4) 5 maximal eccentric knee flexionextensions at 1508 per second. Main Outcome Measure(s): Hamstrings and quadriceps peak torque, hamstrings-to-quadriceps ratio, lateral and medial hamstrings root mean square. Results: We found no difference in quadriceps peak torque for any condition across all hip-flexion angles, whereas hamstrings peak torque was lower at 08 of hip flexion than at any other angle (P <.001) and greater at 908 of hip flexion than at 308 and 608 (P <.05), especially in eccentric conditions. As hip flexion increased, the hamstrings-to-quadriceps ratio increased. No difference in lateral or medial hamstrings root mean square was found for any condition across all hip-flexion angles (P >fvc.05). Conclusions: Hip-flexion angle influenced hamstrings peak torque in all muscular contraction types; as hip flexion increased, hamstrings peak torque increased. Researchers should investigate further whether an eccentric resistance training program at sprint-specific hip-flexion angles (70° to 80°) could help prevent hamstrings injuries in sprinters. Moreover, hamstrings-to-quadriceps ratio assessment should be standardized at 808 of hip flexion.
机译：背景：Ham绳肌拉伤很常见，在许多运动中使人衰弱。大多数腿筋练习的髋屈角度都不足够，因为在短跑腿摆动阶段结束时，当大多数受伤发生时，该角度超过70°。目的：评估不同的髋屈角度对等轴测，同心和偏心收缩中膝屈肌峰值扭矩的影响，以及对ham绳肌与股四头肌之比的影响。设计：描述性实验室研究。地点：研究实验室。患者和其他参与者：十名国家级短跑选手（5名男性，5名女性;年龄= 21.2±3.6岁，身高= 175±6 cm，质量= 63.8±9.9 kg）。干预：对于每个髋部位置（0度，30度，60度和908度屈曲），参与者使用右腿进行（1）在458度屈曲时最大等距绳肌收缩5秒，（2 ）5个最大每秒608的同心膝盖屈伸，（3）5个最大每秒608的偏心膝盖屈伸，（4）5个最大每秒1508个偏心膝盖屈伸。主要观察指标：Ham绳肌和股四头肌的峰值扭矩，绳肌与股四头肌的比率，外侧和内侧绳肌的均方根。结果：我们发现，在所有条件下，所有髋屈曲角度下的股四头肌峰值扭矩均无差异，而臀部屈曲时的绳肌峰值扭矩低于其他任何角度（P <.001），而髋关节屈曲908时则大于在308和608（P <.05），尤其是在偏心条件下。随着髋部屈曲增加，,绳肌与股四头肌的比例增加。在所有髋屈曲角度的任何情况下，外侧或内侧media绳肌的均方根均无差异（P> fvc.05）。结论：髋关节屈曲角度影响所有肌肉收缩类型的绳肌峰值扭矩。随着髋部屈曲增加，,绳肌的峰值扭矩增加。研究人员应进一步研究以短跑特定的髋屈曲角度（70°至80°）进行的偏心阻力训练计划是否有助于预防短跑运动员的绳肌损伤。此外，绳肌与股四头肌的比率评估应在髋屈曲808时进行标准化。

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