Resistance training during unweighting maintains muscle size and function in human calf

Hiroshi Akima, Jun Ichi Ushiyama, Junjiro Kubo, Shin Ichi Tonosaki, Masamitsu Itoh, Yasuo Kawakami, Hideoki Fukuoka, Hiroaki Kanehisa, Tetsuo Fukunaga

研究成果: Article

59 引用 (Scopus)

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Purpose: A 20-d 6° head-down tilt bed rest project was conducted to evaluate the effect of dynamic leg press and plantar flexion resistance training on muscle size and function in human plantar flexors (PF) throughout the prolonged bed rest. Methods: Twelve healthy men participated in this study and were divided two groups: resistance training (BR-Tr group: N = 6, age: 23 ± 2 yr, height: 170 ± 3 cm, weight: 66 ± 7 kg) and nontraining (BR-Cont group: N = 6, age: 23 ± yr, height: 170 ± 3 cm, weight: 67 ± 6 kg) during the bed rest. Physiological cross-sectional area (PCSA) and peak torque of the PF muscle group was determined. Spin-spin relaxation times (T2) of the medial (MG) and lateral gastrocnemius (LG) and soleus (Sol) muscle was measured at rest and immediately after unilateral calf-raising exercise (5 sets of 10 reps). Results: PCSA of the PF muscle group did not show any significant change in BR-Tr group; however, for the BR-Cont group, PCSA decreased by 13% after bed rest (P < 0.05). There was no significant change in exercise-induced T2 change of the MG, LG, or Sol muscles between before and after the bed rest in BR-Tr group; however, in the BR-Cont group, significant increases in T2 were found in these three muscles after the bed rest (P < 0.05 to 0.01). Conclusion: We conclude that dynamic leg press and plantar flexion resistance training during bed rest maintains muscle size and function (torque and T2), and that this training could be useful for prevention of progressive muscle deconditioning during spaceflight.

元の言語English
ページ(範囲)655-662
ページ数8
ジャーナルMedicine and Science in Sports and Exercise
35
発行部数4
DOI
出版物ステータスPublished - 2003 4 1

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ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

これを引用

Akima, H., Ushiyama, J. I., Kubo, J., Tonosaki, S. I., Itoh, M., Kawakami, Y., Fukuoka, H., Kanehisa, H., & Fukunaga, T. (2003). Resistance training during unweighting maintains muscle size and function in human calf. Medicine and Science in Sports and Exercise, 35(4), 655-662. https://doi.org/10.1249/01.MSS.0000058367.66796.35