Key result
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%.
Why the study?
Does repeated sprint training improve oxygen uptake and muscle deoxygenation kinetics in recreationally active subjects?
RCT (n=24)
Does repeated sprint training improve oxygen uptake and muscle deoxygenation kinetics in recreationally active subjects?
p-value: p=<0.01
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.
May support sprint over endurance training for faster VO2 kinetics in active adults; leaves open translation to clinical populations.
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.
No takes yet. Share an insight, caveat, or question.
Bailey et al. (2009) conducted an 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%.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: