- 著者
- T. Abe T. Yasuda T. Midorikawa Y. Sato C. F. Kearns K. Inoue K. Koizumi N. Ishii
- 出版者
- Japan Kaatsu Training Society
- 雑誌
- International Journal of KAATSU Training Research (ISSN:13494562)
- 巻号頁・発行日
- vol.1, no.1, pp.6-12, 2005 (Released:2008-07-18)
- 参考文献数
- 31
- 被引用文献数
- 172 190
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
- M. Tanimoto H. Madarame N. Ishii
- 出版者
- 日本加圧トレーニング学会
- 雑誌
- International Journal of KAATSU Training Research (ISSN:13494562)
- 巻号頁・発行日
- vol.1, no.2, pp.51-56, 2005 (Released:2008-07-18)
- 参考文献数
- 27
- 被引用文献数
- 15 46
We investigated the acute effects of “Kaatsu” resistance exercise and other types of exercise on muscle oxygenation and plasma growth hormone. Six young male bodybuilders performed leg extension exercise according to four exercise regimens: low-intensity [∼30% of one repetition maximum (1RM)] exercise with moderate occlusion (LO-Kaatsu), low-intensity (∼50% 1RM) exercise with slow movement and tonic force generation (3 s for lowering and 3 s for lifting actions, 1-s pause, and no relaxing phase; LST), low-intensity (same as LST) isometric exercise at 45° knee angle (ISO), and high-intensity (∼80% 1RM) exercise with normal movement speed (HN), commonly used for gaining muscular size and strength. The muscle oxygenation level measured with near-infrared continuous-wave spectroscopy (NIRcws) showed the largest changes during and after LO-Kaatsu among all regimens. The minimum oxygenation level during LO-Kaatsu was the lowest among the four exercise regimens. On the other hand, the increases in muscle oxygenation after LO-Kaatsu were the largest among the four regimens. Plasma GH and blood lactate concentrations after LO-Kaatsu, LST and HN were significantly (P < 0.05) higher than those after ISO, but there were no significant differences among those after LO-Kaatsu, LST and HN. The results indicate that “Kaatsu” resistance exercise causes marked changes in muscle oxygenation level and circulating growth hormone, both of which may be related to muscular hypertrophy.