Affiliations: [a] Department of Rehabilitation Physical Therapy Course, Faculty of Health Science, Suzuka University of Medical Science, Suzuka, Japan | [b] Graduate School of Sport and Exercise Sciences, Osaka University of Health and Sport Sciences, Sennan, Japan | [c] Rehabilitation Center, Oumionsen Hospital, Higashioumi, Japan
Correspondence:
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Corresponding author: Kazuhiro Ito, Department of Rehabilitation Physical Therapy Course, Faculty of Health Science, Suzuka University of Medical Science, 1001-1 Kishioka, Suzuka-city, Mie 510-0293, Japan. Tel.: +81 59 383 8991; Fax: +81 59 383 9666; E-mail: Japanito@suzuka-u.ac.jp.
Abstract: BACKGROUND: Hip flexion angle-torque may not be measured accurately due to the measurement posture. OBJECTIVE: Maximum isometric hip flexion torque was measured while excluding the effects of postural retention function and compensatory motion. METHODS: Experiment 1: Maximum isometric flexion torque of the hip joint was measured at 0∘, 30∘, 60∘, 90∘, and 105∘ in 195 participants. Experiment 2: Maximum isometric hip flexion torque of 33 participants was measured in standing and supine position at 0∘ hip flexion and in end-sitting and supine position at 105∘. RESULTS: Experiment 1: No interaction was observed between sex and hip angle, and hip flexion torque was minimum at 0∘ hip flexion and maximum at 105∘ hip flexion in both sexes (p< 0.01). Experiment 2: An interaction between measurement position and hip angle was observed, with maximum isometric flexion torque being greater in the supine position than in the standing position (p< 0.01). Maximum isometric hip flexion torque was greater at 105∘ than at 0∘ flexion (p< 0.01). CONCLUSIONS: Maximum isometric hip flexion torque showed greater joint angle-torque characteristics in deep flexion than in shallow flexion of the hip when excluding the effects of postural retention function and compensatory motion.
Keywords: Hip flexion torque, muscle strength, joint angle-torque characteristic, hip joint, Hand-Held-Dynamometer
