Six sessions of repeated sprint training, but not endurance training, accelerated phase II Vo2 kinetics during moderate (21 vs 28 s; P<0.01) and severe exercise and improved exercise tolerance by 53%.
RCT (n=24)
Does repeated sprint training improve oxygen uptake and muscle deoxygenation kinetics in recreationally active subjects?
Short-term repeated sprint training is more effective than work-matched moderate-intensity endurance training at improving muscle oxygen extraction, oxygen uptake kinetics, and exercise tolerance.
p-value: p=<0.01
We hypothesized that a short-term training program involving repeated all-out sprint training (RST) would be more effective than work-matched, low-intensity endurance training (ET) in enhancing the kinetics of oxygen uptake (Vo (2) ) and muscle deoxygenation deoxyhemoglobin concentration (HHb) following the onset of exercise. Twenty-four recreationally active subjects (15 men, mean +/- SD: age 21 +/- 4 yr, height 173 +/- 9 cm, body mass 71 +/- 11 kg) were allocated to one of three groups: RST, which completed six sessions of four to seven 30-s RSTs; ET, which completed six sessions of work-matched, moderate-intensity cycling; and a control group (CON). All subjects completed moderate-intensity and severe-intensity "step" exercise transitions before (Pre) and after the 2-wk intervention period (Post). Following RST, HHb kinetics were speeded, and the amplitude of the HHb response was increased during both moderate and severe exercise (P < 0. 05) ; the phase II Vo (2) kinetics were accelerated for both moderate (Pre: 28 +/- 8, Post: 21 +/- 8 s; P < 0. 01) and severe (Pre: 29 +/- 5, Post: 23 +/- 5 s; P < 0. 05) exercise; the amplitude of the Vo (2) slow component was reduced (Pre: 0. 52 +/- 0. 19, Post: 0. 40 +/- 0. 17 l/min; P < 0. 01) ; and exercise tolerance during severe exercise was improved by 53% (Pre: 700 +/- 234, Post: 1, 074 +/- 431 s; P < 0. 01). None of these parameters was significantly altered in the ET and CON groups. Six sessions of RST, but not ET, resulted in changes in HHb kinetics consistent with enhanced fractional muscle O (2) extraction, faster Vo (2) kinetics, and an increased tolerance to high-intensity exercise.
Bailey et al. (Fri,) conducted a rct in Healthy / Recreationally active (n=24). Repeated all-out sprint training (RST) vs. Work-matched, moderate-intensity cycling (ET) and control (CON) was evaluated on Phase II oxygen uptake (Vo2) kinetics and muscle deoxygenation (p=<0.01). Six sessions of repeated sprint training, but not endurance training, accelerated phase II Vo2 kinetics during moderate (21 vs 28 s; P<0.01) and severe exercise and improved exercise tolerance by 53%.
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