著者

藤岡 正子 佐古 隆之 木目 良太郎 村瀬 訓生 長田 卓也 下村 浩祐 白石 聖 勝村 俊仁 佐藤 和人

出版者

イセブ

雑誌

日本運動生理学雑誌 (ISSN:13403036)

巻号頁・発行日

vol.17, no.2, pp.35-42, 2010-07

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The purpose of this study was to determine whether 6 weeks handgrip endurance exercise training affects resting muscle metabolic rate in forearm flexor muscles. Eight healthy female subjects (22±0yr) performed dynamic handgrip exercise training until exhaustion at 30% of maximum voluntary contraction, 1Hz (0.5s contraction, 0.5s relaxation). Aerobic exercise for localized muscle training was carried out for 1 set per day, 5 days a week, for 6 weeks. Resting muscle metabolic rate, and time constant for phosphocreatine (PCr) recovery as an index of muscle oxidative capacity were measured using ^<31>P magnetic resonance spectroscopy (^<31>P-MRS) pre- and post-training. Performance time was evaluated during handgrip exercise at 30% MVC. The time constant tended to be shorter post-training (46.6±2.9s) compared with pre-training (50.7±2.8s) (p=0.07). After training, the performance time (84.5±5.8s) was significantly longer than pre-training (52.9±3.5s) (p<0.05). No significant difference of resting metabolic rate was found between pre- and post-training (5.8±0.4, 6.0±0.3μM ATP/s pre- and post-training, respectively). These results suggest that the resting muscle metabolic rate in forearm flexor muscles was unchanged by localized aerobic exercise training, even though muscle endurance capacity improved.