Skeletal muscle size and circulating IGF-1 are increased after two weeks of twice daily “KAATSU” resistance training
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概要
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This study investigated the effects of twice daily sessions of low-intensity resistance training (LIT, 20% of 1-RM) with restriction of muscular venous blood flow (namely “LIT-Kaatsu” training) for two weeks on skeletal muscle size and circulating insulin-like growth factor-1 (IGF-1). Nine young men performed LIT-Kaatsu and seven men performed LIT alone. Training was conducted two times / day, six days / week for 2 weeks using 3 sets of two dynamic exercises (squat and leg curl). Muscle cross-sectional area (CSA) and volume were measured by magnetic resonance imaging at baseline and 3 days after the last training session (post-testing). Mid-thigh muscle-bone CSA was calculated from thigh girth and adipose tissue thickness, which were measured every morning prior to the training session. Serum IGF-1 concentration was measured at baseline, mid-point of the training and post-testing. Increases in squat (17%) and leg curl (23%) one-RM strength in the LIT-Kaatsu were higher (p<0.05) than those of the LIT (9% and 2%). There was a gradual increase in circulating IGF-1 and muscle-bone CSA (both p<0.01) in the LIT-Kaatsu, but not in the LIT. Increases in quadriceps, biceps femoris and gluteus maximus muscle volume were, respectively, 7.7%, 10.1% and 9.1% for LIT-Kaatsu (p<0.01) and 1.4%, 1.9% and -0.6% for LIT (p>0.05). There was no difference (p>0.05) in relative strength (1-RM / muscle CSA) between baseline and post-testing in both groups. We concluded that skeletal muscle hypertrophy and strength gain occurred after two weeks of twice daily LIT-Kaatsu training.
著者
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Sato Y.
Department of Ischemic Circulatory Physiology, Kaatsu Training, The University of Tokyo
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Abe T.
Department of Exercise and Sport Science, Tokyo Metropolitan University
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Yasuda T.
Department of Exercise and Sport Science, Tokyo Metropolitan University
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Midorikawa T.
Department of Exercise and Sport Science, Tokyo Metropolitan University
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Kearns C.
Cardiovascular/Endocrine Biology, Schering-Plough Research Institute
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Inoue K.
Orthopedic Medical Clinic
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Koizumi K.
Department of Radiology, Tokyo Medical Uiversity Hachioji Medical Center
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Ishii N.
Department of Life Science, University of Tokyo
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