title: Influence of Hip Joint Position on Muscle Activity during Prone Hip Extension with Knee Flexion.
abstract: [Purpose] This study investigated the selective activation of the gluteus maximus during a prone hip extension with knee flexion exercise, with the hip joint in different positions. [Subjects] The subjects were 21 healthy, male volunteers. [Methods] Activities of the right gluteus maximus, right hamstrings, bilateral lumbar erector spinae, and bilateral lumbar multifidus were measured using surface electromyography during a prone hip extension with knee flexion exercise. Measurements were made with the hip joint in each of 3 positions: (1) a neutral hip joint position, (2) an abduction hip joint position, and (3) an abduction with external rotation hip joint position. [Results] Gluteus maximus activity was significantly higher when the hip was in the abduction with external rotation hip joint position than when it was in the neutral hip joint and abduction hip joint positions. Gluteus maximus activity was also significantly higher in the abduction hip joint position than in the neutral hip joint position. Hamstring activity was significantly lower when the hip was in the abduction with external rotation hip joint position than when it was in the neutral hip joint and abduction hip joint positions. [Conclusion] Abduction and external rotation of the hip during prone hip extension with knee flexion exercise selectively activates the gluteus maximus.
authors.affiliation: 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.forename: Tadanobu
authors.initials: T
authors.lastname: Suehiro
authors.affiliation: Graduate School of Health Sciences, Kibi International University, Japan.
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Mizutani
authors.affiliation: Department of Rehabilitation, Takedayama Clinic, Japan.
authors.forename: Mitsuhisa
authors.initials: M
authors.lastname: Okamoto
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ishida
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kobara
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors.forename: Daisuke
authors.initials: D
authors.lastname: Fujita
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Osaka
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors.forename: Hisashi
authors.initials: H
authors.lastname: Takahashi
authors.affiliation: Department of Rehabilitation, Faculty of Health Science and Technology, Kawasaki University of Medical Welfare, Japan.
authors.forename: Susumu
authors.initials: S
authors.lastname: Watanabe
keywords: Electromyography; Hip joint position; Prone hip extension with knee flexion