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Received February 4, 2004
Revised April 2, 2004
Accepted after revision June 23, 2004
1 Institute of Exercise and Sport Sciences
* To whom correspondence should be addressed. E-mail: jbangsbo{at}aki.ku.dk.
The present study tested the hypothesis that intense intermittent training enhances human skeletal muscle blood flow and oxygen uptake (VO2) at the onset of dynamic exercise. Moreover it was investigated whether possible training effects were dependent on exercise intensity. Six habitually active males carried out 7 weeks of intermittent-exercise one-legged knee-extensor training at an intensity eliciting ~150% of peak thigh VO2 on 3-5 occasions per week. After the training period, cardiovascular and metabolic measurements were performed during knee-extensor exercise with the trained leg (TL) and the control leg (CL) for 10 min at an intensity of 10 and 30 W as well as for 4 min at 50 W. Femoral venous blood flow was higher (p<0.05) in TL than CL from 75 s to 180 s at 30 W (~75 s: 3.43±0.20 vs. 2.99±0.18 l/min) and from 40 s to 210 s at 50 W (~75 s: 5.03±0.41 vs. 4.13±0.33 l/min). Mean arterial pressure was not different between legs and thus, thigh vascular conductance was higher (p<0.05) in TL than CL from 35 s to 270 s at 30 W and from 150 s to 240 s at 50 W. Femoral a-v O2 difference was higher (p<0.05) in TL than CL from 20 s to 70 s at 30 W, but was not different between TL and CL at 50 W. Thigh VO2 was higher (p<0.05) in TL than CL from 20 s to 110 s at 30 W (~45 s: 0.38±0.04 vs. 0.30±0.03 l/min), and from 45 s to 240 s at 50 W (~45 s: 0.64±0.06 vs. 0.44±0.08 l/min). No differences were observed between TL and CL during exercise at 10 W. The present data demonstrate that intense interval training elevates muscle oxygen uptake, blood flow and vascular conductance in the initial phase of exercise at high, but not at low, intensities.
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