Iwashita Yuki, Kuruma Hironobu
Graduate School of Health Science, Tokyo Metropolitan University: 7-2-10 Higashi-ogu, Arakawa-ku, Tokyo 116-8551, Japan.
Oval Nakameguro Orthopedics, Japan.
J Phys Ther Sci. 2023 Jul;35(7):528-532. doi: 10.1589/jpts.35.528. Epub 2023 Jul 1.
[Purpose] Clam exercise is commonly used to strengthen hip abductor muscles. This study aimed to classify the directions of greater trochanter movement during clam exercise and examine whether this classification reveals any differences in the characteristics of muscle activities. [Participants and Methods] Twenty healthy male participants were included and were divided into three groups according to the direction of greater trochanter movements during clam exercise: diagonally upward, backward, and upward. Muscle activity of the gluteus medius, gluteus maximus, tensor fascia lata, and external oblique was measured during clam exercise, along with the direction of greater trochanter movement and maximum muscle strength in the clam exercise limb position. [Results] In the diagonally upward group, the gluteus medius muscles showed higher activity than the other three muscles, and their activity was higher in the diagonally upward and backward groups than in the upward group. [Conclusion] The tension and action vector of the muscles changed due to differences in the direction of the greater trochanter movement caused by the movement pattern of each participant. The muscle activity around the hip joint changes with the direction of greater trochanter movement during clam exercise.
[目的]蚌式运动常用于强化髋外展肌。本研究旨在对蚌式运动过程中大转子的运动方向进行分类，并检验这种分类是否揭示了肌肉活动特征的差异。[参与者与方法]纳入20名健康男性参与者，根据蚌式运动过程中大转子的运动方向将其分为三组：斜向上、向后和向上。在蚌式运动过程中，测量臀中肌、臀大肌、阔筋膜张肌和腹外斜肌的肌肉活动，以及大转子的运动方向和蚌式运动肢体位置的最大肌肉力量。[结果]在斜向上组中，臀中肌的活动高于其他三块肌肉，且其在斜向上组和向后组中的活动高于向上组。[结论]由于每个参与者运动模式导致的大转子运动方向差异，肌肉的张力和作用向量发生了变化。在蚌式运动过程中，髋关节周围的肌肉活动随大转子运动方向而变化。
