Lee Chang-Ryeol, Kim Myoung-Kwon
Department of Physical Therapy, Korea Nazarene University, Republic of Korea.
Department of Physical Therapy, Youngsan University, Republic of Korea.
J Phys Ther Sci. 2014 May;26(5):675-7. doi: 10.1589/jpts.26.675. Epub 2014 May 29.
[Purpose] This study determined the difference between flatfeet and normal feet in humans on an ascending slope using electromyography (EMG). [Subjects] This study was conducted on 30 adults having normal feet (n=15) and flatfeet (n=15), all of whom were 21 to 30 years old. [Methods] A treadmill (AC5000M, SCIFIT,) was used to analyze kinematic features during gait. These features were analyzed at slow, normal, and fast gait velocities on an ascending slope. A surface electromyogram (TeleMyo 2400T, Noraxon Co., USA) was used to measure muscle activity changes. [Results] The activities of most muscles in the subjects with flatfeet were significantly different from the muscle activities in the subjects with normal feet at different gait velocities on an ascending slope. There were significant differences in the vastus medialis and abductor hallucis muscles. [Conclusion] Because muscle activation of the vastus medialis in relation to stability of the lower extremity has a tendency to increase with an increase in gait velocity on an ascending slope, we hypothesized that higher impact transfer to the knee joints occurs in subjects with flatfeet due to the lack of a medial longitudinal arch and that the abductor halluces muscles, which provide dynamic stability to the medial longitudinal arches, do not activate well when they are needed in subjects with flatfeet.
[目的] 本研究利用肌电图（EMG）测定人类在爬坡时扁平足与正常足之间的差异。[对象] 本研究对30名成年人进行，其中正常足者（n = 15）和扁平足者（n = 15），年龄均在21至30岁之间。[方法] 使用跑步机（AC5000M，SCIFIT）分析步态期间的运动学特征。在爬坡时的慢、正常和快步态速度下对这些特征进行分析。使用表面肌电图（TeleMyo 2400T，美国Noraxon公司）测量肌肉活动变化。[结果] 在爬坡时不同步态速度下，扁平足受试者的大多数肌肉活动与正常足受试者的肌肉活动存在显著差异。股内侧肌和拇展肌存在显著差异。[结论] 由于在爬坡时，随着步态速度增加，与下肢稳定性相关的股内侧肌的肌肉激活有增加的趋势，我们推测扁平足受试者由于缺乏内侧纵弓，会对膝关节产生更高的冲击传递，并且在扁平足受试者需要时，为内侧纵弓提供动态稳定性的拇展肌不能很好地激活。
