O'Brien, Brendan J., Wibskov, Jim, Knez, Wade L., Paton, Carl D., and Harvey, Jack T. (2008) The effects of interval-exercise duration and intensity on oxygen consumption during treadmill running. Journal of Science and Medicine in Sport, 11 (3). pp. 287-290.

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Abstract

The magnitude of improvement in peak oxygen uptake (V(O₂peak)) and performance to an exercise training regime is related to the V(O₂) of prior accumulated exercise training bouts. However, it is unclear whether constant rate training (CRT) or interval training (INT) preferentially alters the V(O₂) of running exercise. Therefore, the purpose of this study was to compare the acute V(O₂) response to constant, and interval training sessions. Consequently, this study compared the mean average V(O₂) of 17 moderately trained participants to a 20-min CRT and two different 20 min INT treadmill runs. Participants completed three treatments (twice) in random order over 3 weeks. In 1 min INT participants completed 10 × 1 min efforts at the velocity corresponding to V(O₂)(V(peak)) interspersed with 10 × 1 min efforts at 0.5V(peak). In the 2 min INT, participants completed 5 × 2 min efforts at the V(peak) interspersed with 5 × 2 min efforts at 0.5 at V(peak). In CRT participants ran at a velocity equivalent to the mean velocity of INT (75% V(peak)). Mean average V(O₂) for 2 min INT, 1 min INT and CRT were, respectively, 3200 ± 661; 3076 ± 6041; 2909 ± 584 ml min⁻¹. Both INT sessions resulted in a significantly higher mean average V(O₂) than CRT. Furthermore, 2 min INT resulted in 90% of V(O₂peak) being exceeded more frequently than 1 min INT. We conclude that INT serves as a more potent stimulus for improvement in V(O₂peak) and subsequent endurance performance than CRT.

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