短下肢装具装着側への側方体重移動量の変化が移動側足部周囲筋の筋活動に与える影響

• Published in: 関西理学療法 Vol. 18; pp. 64 - 69
• Main Authors: 中道, 哲朗, 野口, 翔平, 鈴木, 俊明, 清水, 啓介, 松田, 大哉
• Format: Journal Article
• Language: Japanese
• Published: 関西理学療法学会 2018
• Subjects: ankle foot orthosis; foot muscles; lateral weight shift
• ISSN: 1346-9606; 1349-9572
• DOI: 10.11354/jkpt.18.64

To investigate the effects on postural change and muscle activity in foot muscles during lateral weight shift while wearing an AFO. The subjects were 15 healthy men (average age 24.9 ± 2.5 years old). They performed a lateral weight shift in the standing position to the right lower limb while wearing an AFO on the right foot, then repeated the process without one. In each instance, postural change and electromyograms (EMG) of the peroneus, foot supinator muscles, and tibialis anterior were measured. When initiating the lateral weight shift while wearing the AFO, hip adduction on the moving side resulted in pelvic depression on the non-moving side. Continuation of the lateral weight shift also resulted in lateral flexion of the thoracolumbar area on the moving side, as well as outward inclination of the lower limb on the moving side. Compared to the barefoot lateral weight shift, there was a trend toward overall decrease in muscle activity in the peroneus, foot supinator muscles, and tibialis anterior. During a lateral weight shift while wearing an AFO, the AFO limits both foot pronation and supination. It can be surmised that this function of the AFO results in reduced muscle activity of the peroneus, used for grounding the foot, as well as in reduced muscle activity of the foot supinator muscles and tibialis anterior, which are used to restrict outward inclination of the lower limbs.