jenan546
2008-03-29, 13:09
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Abstract:
Muscle size and strength are increased following walk training with restricted venous blood flow from the leg muscle, Kaatsu-walk training.
Abe T, Kearns CF, Sato Y.
Department of Exercise and Sport Science, Tokyo Metropolitan University, University of Tokyo, Tokyo, Japan. musclethickness@yahoo.co.jp
Previous studies have shown that low-intensity resistance training with restricted muscular venous blood flow (Kaatsu) causes muscle hypertrophy and strength gain. To investigate the effects of daily physical activity combined with Kaatsu, we examined the acute and chronic effects of walk training with and without Kaatsu on MRI-measured muscle size and maximum dynamic (one repetition maximum) and isometric strength, along with blood hormonal parameters. Nine men performed Kaatsu-walk training, and nine men performed walk training alone (control-walk). Training was conducted two times a day, 6 days/wk, for 3 wk using five sets of 2-min bouts (treadmill speed at 50 m/min), with a 1-min rest between bouts. Mean oxygen uptake during Kaatsu-walk and control-walk exercise was 19.5 (SD 3.6) and 17.2 % (SD 3.1) of treadmill-determined maximum oxygen uptake, respectively. Serum growth hormone was elevated (P < 0.01) after acute Kaatsu-walk exercise but not in control-walk exercise. MRI-measured thigh muscle cross-sectional area and muscle volume increased by 4-7%, and one repetition maximum and maximum isometric strength increased by 8-10% in the Kaatsu-walk group. There was no change in muscle size and dynamic and isometric strength in the control-walk group. Indicators of muscle damage (creatine kinase and myoglobin) and resting anabolic hormones did not change in both groups. The results suggest that the combination of leg muscle blood flow restriction with slow-walk training induces muscle hypertrophy and strength gain, despite the minimal level of exercise intensity. Kaatsu-walk training may be a potentially useful method for promoting muscle hypertrophy, covering a wide range of the population, including the frail and elderly.
Fulltext:
http://jap.physiology.org/cgi/content/full/100/5/1460
De personer som deltog i studien hade inte tränat på minst ett år innan studien, men det kanske kan ge resultat för tränande individer också. De fick gå 100 m på 2 min, vila en minut och upprepa 5 gånger. De utförde detta 2 gånger per dag och det ökade muskelvolymen med 4-7% på tre veckor.
Abstract:
Muscle size and strength are increased following walk training with restricted venous blood flow from the leg muscle, Kaatsu-walk training.
Abe T, Kearns CF, Sato Y.
Department of Exercise and Sport Science, Tokyo Metropolitan University, University of Tokyo, Tokyo, Japan. musclethickness@yahoo.co.jp
Previous studies have shown that low-intensity resistance training with restricted muscular venous blood flow (Kaatsu) causes muscle hypertrophy and strength gain. To investigate the effects of daily physical activity combined with Kaatsu, we examined the acute and chronic effects of walk training with and without Kaatsu on MRI-measured muscle size and maximum dynamic (one repetition maximum) and isometric strength, along with blood hormonal parameters. Nine men performed Kaatsu-walk training, and nine men performed walk training alone (control-walk). Training was conducted two times a day, 6 days/wk, for 3 wk using five sets of 2-min bouts (treadmill speed at 50 m/min), with a 1-min rest between bouts. Mean oxygen uptake during Kaatsu-walk and control-walk exercise was 19.5 (SD 3.6) and 17.2 % (SD 3.1) of treadmill-determined maximum oxygen uptake, respectively. Serum growth hormone was elevated (P < 0.01) after acute Kaatsu-walk exercise but not in control-walk exercise. MRI-measured thigh muscle cross-sectional area and muscle volume increased by 4-7%, and one repetition maximum and maximum isometric strength increased by 8-10% in the Kaatsu-walk group. There was no change in muscle size and dynamic and isometric strength in the control-walk group. Indicators of muscle damage (creatine kinase and myoglobin) and resting anabolic hormones did not change in both groups. The results suggest that the combination of leg muscle blood flow restriction with slow-walk training induces muscle hypertrophy and strength gain, despite the minimal level of exercise intensity. Kaatsu-walk training may be a potentially useful method for promoting muscle hypertrophy, covering a wide range of the population, including the frail and elderly.
Fulltext:
http://jap.physiology.org/cgi/content/full/100/5/1460
De personer som deltog i studien hade inte tränat på minst ett år innan studien, men det kanske kan ge resultat för tränande individer också. De fick gå 100 m på 2 min, vila en minut och upprepa 5 gånger. De utförde detta 2 gånger per dag och det ökade muskelvolymen med 4-7% på tre veckor.