Fujisawa Hiroyuki, Suzuki Hiroto, Yamaguchi Emi, Yoshiki Hiromi, Wada Yui, Watanabe Aya
Department of Rehabilitation, Faculty of Medical Science and Welfare, Tohoku Bunka Gakuen University, Japan.
J Phys Ther Sci. 2014 Feb;26(2):187-90. doi: 10.1589/jpts.26.187. Epub 2014 Feb 28.
[Purpose] This study aimed to determine the effect of varying hip flexion angle on hip muscle activity during isometric contraction in abduction. [Subjects] Twenty-seven healthy men (mean age=21.5 years, SD=1.2) participated in this study. [Methods] Surface electromyography (EMG) was recorded of the upper portion of the gluteus maximus (UGM), lower portion of the gluteus maximus (LGM), tensor fasciae latae (TFL), and gluteus medius (GMed) during isometric contraction under two measurement conditions: hip flexion angle (0, 20, 40, 60, and 80 degrees) and abduction of the hip joint at 20, 40, 60, and 80% maximum strength. Integrated EMG (IEMG) were calculated and normalized to the value of maximum voluntary contraction (MVC). [Results] Results indicated that the IEMG of both the UGM and LGM increased significantly with increases in hip flexion angle, whereas the IEMG of the TFL decreased significantly. The maximum activities of the UGM and the LGM were 85.7 ± 80.8%MVC and 38.2 ± 32.9%MVC at 80 degrees of hip flexion, respectively, and that of the TFL was 71.0 ± 39.0%MVC at 40 degrees of hip flexion. [Conclusion] The IEMG of the GMed did not change with increases in hip flexion angle. Hip flexion angle affected the activity of the GM and TFL during isometric contraction in abduction.
[目的] 本研究旨在确定不同髋关节屈曲角度对等长外展收缩时髋部肌肉活动的影响。[对象] 27名健康男性（平均年龄 = 21.5岁，标准差 = 1.2）参与了本研究。[方法] 在两种测量条件下对等长收缩过程中的臀大肌上部（UGM）、臀大肌下部（LGM）、阔筋膜张肌（TFL）和臀中肌（GMed）进行表面肌电图（EMG）记录：髋关节屈曲角度（0、20、40、60和80度）以及髋关节在最大力量的20%、40%、60%和80%时的外展。计算积分肌电图（IEMG）并将其归一化为最大自主收缩（MVC）值。[结果] 结果表明，UGM和LGM的IEMG均随髋关节屈曲角度增加而显著增加，而TFL的IEMG则显著降低。髋关节屈曲80度时，UGM和LGM的最大活动分别为85.7±80.8%MVC和38.2±32.9%MVC，髋关节屈曲40度时，TFL的最大活动为71.0±39.0%MVC。[结论] GMed的IEMG不随髋关节屈曲角度增加而变化。髋关节屈曲角度在等长外展收缩过程中影响臀大肌和阔筋膜张肌的活动。
