Effect of hip joint angle on concentric knee extension torque
Effect of hip joint angle on concentric knee extension torque
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DOI：
10.1016/j.jelekin.2017.10.012
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发表时间：
2017-12-01
影响因子：
2.5
通讯作者：
Kawakami, Yasuo
中科院分区：
文献类型：
--
作者：
Ema, Ryoichi;Wakahara, Taku;Kawakami, Yasuo
这项研究检验了这样的假设：在单次膝关节伸展任务中，髋关节角度对同心膝关节伸展扭矩的影响取决于膝关节角度。 12 名男子以最大努力在完全伸展和 80 度屈髋的位置上进行同心膝关节伸展。角速度设置为 30 度 s(-1) 和 180 度 s(-1)。比较两个髋位置之间的峰值扭矩以及膝关节在 30 度、50 度、70 度和 90 度（解剖位置 = 0 度）时获得的扭矩。使用表面肌电图测定股外侧肌、内侧肌、股直肌和股二头肌的肌肉激活。无论角速度如何，弯曲髋部位置的峰值扭矩明显大于伸展髋部位置。膝关节在两种角速度下的 70 度和 90 度处以及 180 度 s(-1) 处的 50 度处的扭矩在屈曲髋部位置时显着大于在伸展髋部位置时的扭矩，而在膝关节的 30 度（在任一角速度下）和 50 度（在 30 度 s(-1) 处）时没有发现相应的差异。在任何肌肉中都没有观察到臀部位置对肌肉激活的影响。这些结果支持了我们的假设，并且可能与股直肌的力-长度和力-速度特征有关。
This study tested the hypothesis that the effect of hip joint angle on concentric knee extension torque depends on knee joint angle during a single knee extension task. Twelve men performed concentric knee extensions in fully extended and 80 degrees flexed hip positions with maximal effort. The angular velocities were set at 30 degrees s(-1) and 180 degrees s(-1). The peak torque and torques attained at 30 degrees, 50 degrees, 70 degrees and 90 degrees (anatomical position= 0 degrees) of the knee joint were compared between the two hip positions. Muscle activations of the vastus lateralis, medialis, rectus femoris and biceps femoris were determined using surface electromyography. The peak torque was significantly greater in the flexed than in the extended hip position irrespective of angular velocity. The torques at 70 degrees and 90 degrees of the knee joint at both angular velocities and at 50 degrees at 180 degrees s(-1) were significantly greater in the flexed than in the extended hip position, whereas corresponding differences were not found at 30 degrees (at either angular velocity) and 50 degrees (at 30 degrees s(-1)) of the knee joint. No effect of hip position on muscle activation was observed in any muscle. These results supported our hypothesis and may be related to the force-length and force-velocity characteristics of the rectus femoris.