Resisted Side Stepping: The Effect of Posture on Hip Abductor Muscle Activation.
Resisted Side Stepping: The Effect of Posture on Hip Abductor Muscle Activation.
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DOI：
10.2519/jospt.2015.5888
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发表时间：
2015-09
期刊：
影响因子：
--
通讯作者：
Lewis CL
中科院分区：
文献类型：
--
作者：
Berry JW;Lee TS;Foley HD;Lewis CL
对照实验室研究，重复测量设计。比较运动肢体和站立肢体在抗侧踏过程中的髋关节外展肌活动和髋关节膝关节运动学，并确定肌肉活动是否受到进行练习的姿势（直立站立与蹲立）的影响。髋关节外展肌无力与多种下肢损伤有关。抗侧步常被用作增强髋外展肌力量和耐力的练习。运动处方将受益于了解在侧身运动过程中，每个肢体和不同姿势产生的相对肌肉活动水平。24名健康成年人参加了这项研究。当参与者在保持两种姿势(1)直立站立和2)深蹲时，在脚踝周围用电阻带进行侧步时，收集臀大肌、臀中肌和阔筋膜张肌（TFL）的运动学和表面肌电图（EMG）数据。站立肢体臀大肌、臀中肌和臀胫腓肌的平均归一化肌电信号振幅高于运动肢体（P≤0.001）。与直立站立姿势相比，深蹲姿势的臀肌活动度较高，TFL肌肉活动度较低（P< 0.001）。站立肢体髋外展偏移大于活动肢体（P< 0.001）。3髋外展肌对健康人侧步运动的姿势变化有不同的反应。当处方抵制回避练习时，治疗师应该考虑髋关节外展肌在四肢激活的差异和躯干姿势的变化。
Controlled laboratory study, repeated-measures design. To compare hip abductor muscle activity and hip and knee joint kinematics in the moving limb to the stance limb during resisted side-stepping and also to determine if muscle activity was affected by the posture (upright standing versus squat) used to perform the exercise. Hip abductor weakness has been associated with a variety of lower extremity injuries. Resisted side-stepping is often used as an exercise to increase strength and endurance of the hip abductors. Exercise prescription would benefit from knowing the relative muscle activity level generated in each limb and for different postures during the side-stepping exercise. Twenty-four healthy adults participated in this study. Kinematics and surface electromyographic (EMG) data from the gluteus maximus, gluteus medius, and tensor fascia lata (TFL) were collected as participants performed side-stepping with a resistive band around the ankle while maintaining each of 2 postures: 1) upright standing and 2) squat. Mean normalized EMG signal amplitude of the gluteus maximus, gluteus medius, and TFL was higher in the stance limb than the moving limb (P≤.001). Gluteal muscle activity was higher, while TFL muscle activity was lower, in the squat posture compared to the upright standing posture (P<.001). Hip abduction excursion was greater in the stance limb than in the moving limb (P<.001). The 3 hip abductor muscles respond differently to the posture variations of side-stepping exercise in healthy individuals. When prescribing resisted side-stepping exercises, therapists should consider the differences in hip abductor activation across limbs and variations in trunk posture.