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Low-volume muscular endurance and strength training during 3-week forearm immobilization was effective in preventing functional deterioration

2008; BioMed Central; Volume: 7; Issue: 1 Linguagem: Inglês

10.1186/1476-5918-7-1

1476-5918

Mika Matsumura, Chihoko Ueda, Kiyoshi Shiroishi, Kazuki Esaki, Fumiko Ohmori, Kuniko Yamaguchi, Shiro Ichimura, Yuko Kurosawa, Ryotaro Kime, Takuya Osada, Norio Murase, Toshihito Katsumura, Akinori Hoshika, Takafumi Hamaoka,

Hemodynamic Monitoring and Therapy

Abstract Purpose The purpose of this study was to determine whether endurance and strength hand grip exercises during 3-week upper limb immobilization preserve muscle oxidative capacity, endurance performance and strength. Methods Ten healthy adult men underwent non-dominant forearm immobilization by plaster cast for 21 days. Five healthy adult subjects were designated as the immobilization (IMM) group and five were designated as the immobilization + training (IMM+TRN) group. Grip strength, forearm circumference, dynamic handgrip endurance and muscle oxygenation response were measured before and after the 21 day immobilization period. Using near-infrared spectroscopy (NIRS), muscle oxygen consumption recovery (VO 2 mus) was recorded after a submaximal exercise and the recovery time constant (TcVO 2 mus) was calculated. Reactive hyperemic oxygenation recovery was evaluated after 5 minutes ischemia. Two training programs were performed by the IMM+TRN group twice a week. One exercise involved a handgrip exercise at 30% maximum voluntary contraction (MVC) at a rate of 1 repetition per 1 second until exhaustion (about 60 seconds). The other involved a handgrip exercise at 70% MVC for 2 seconds with a 2 second rest interval, repeated 10 times (40 seconds). Results There was a significant group-by-time interaction between the IMM and IMM+TRN groups in the TcVO 2 mus (p = 0.032, F = 6.711). A significant group-by-time interaction was observed between the IMM and IMM+TRN groups in the MVC (p = 0.001, F = 30.415) and in grip endurance (p = 0.014, F = 9.791). No significant group-by-time interaction was seen in forearm circumference and reactive hyperemic oxygenation response either in IMM or IMM+TRN group. Conclusion The training programs during immobilization period used in this experiment were effective in preventing a decline in muscle oxidative function, endurance and strength.