title: Effect of abduction and external rotation of the hip joint on muscle onset time during prone hip extension with knee flexion.
abstract: [Purpose] This study investigated the effect of hip position on muscle onset time during prone hip extension with knee flexion. [Subjects] The study included 21 healthy male volunteers. [Methods] Muscle onset times of the right gluteus maximus, right hamstrings, bilateral lumbar erector spinae, and bilateral lumbar multifidus were measured using surface electromyography during right hip extension with knee flexion in the prone position. Measurements were made with the hip in 3 positions: (1) neutral, (2) abduction, and (3) abduction and external rotation. [Results] Gluteus maximus onset relative to the hamstrings was significantly earlier with hip abduction and with hip abduction and external rotation compared with that with the hip in the neutral position. Gluteus maximus onset relative to the hamstrings was significantly earlier with hip abduction and external rotation compared with that with hip abduction. The bilateral multifidus and left lumbar erector spinae onset times relative to the hamstrings were significantly earlier with hip abduction and external rotation compared with those with hip abduction and with the hip in the neutral position. [Conclusion] Abduction and external rotation of the hip during prone hip extension with knee flexion is effective for advancing the onset times of the gluteus maximus, bilateral multifidus, and contralateral lumbar erector spinae.
authors: Graduate School of Health Sciences, Kibi International University, Japan ; Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors: Tadanobu
authors: T
authors: Suehiro
authors: Graduate School of Health Sciences, Kibi International University, Japan.
authors: Masatoshi
authors: M
authors: Mizutani
authors: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors: Hiroshi
authors: H
authors: Ishida
authors: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors: Kenichi
authors: K
authors: Kobara
authors: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors: Daisuke
authors: D
authors: Fujita
authors: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors: Hiroshi
authors: H
authors: Osaka
authors: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors: Hisashi
authors: H
authors: Takahashi
authors: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors: Susumu
authors: S
authors: Watanabe
keywords: Hip joint position; Muscle onset time; Prone hip extension with knee flexion
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