Mode of exercise and sex are not important for oxygen consumption during and in recovery from sprint interval training

Most sprint interval training (SIT) research involves cycling as the mode of exercise and whether running SIT elicits a similar excess postexercise oxygen consumption (EPOC) response to cycling SIT is unknown. As running is a more whole-body-natured exercise, the potential EPOC response could be greater when using a running session compared with a cycling session. The purpose of the current study was to determine the acute effects of a running versus cycling SIT session on EPOC and whether potential sex differences exist. Sixteen healthy recreationally active individuals (8 males and 8 females) had their gas exchange measured over similar to 2.5 h under 3 experimental sessions: (i) a cycle SIT session, (ii) a run SIT session, and (iii) a control (CTRL; no exercise) session. Diet was controlled. During exercise, both SIT modes increased oxygen consumption (cycle: male, 1.967 +/- 0.343; female, 1.739 +/- 0.296 L.min(-1); run: male, 2.169 +/- 0.369; female, 1.791 +/- 0.481 L.min(-1)) versus CTRL (male, 0.425 +/- 0.065 L.min(-1); female, 0.357 +/- 0.067; P < 0.001), but not compared with each other (P = 0.234). In the first hour postexercise, oxygen consumption was still increased following both run (male, 0.590 +/- 0.065; female, 0.449 +/- 0.084) and cycle SIT (male, 0.556 +/- 0.069; female, 0.481 +/- 0.110 L.min(-1)) versus CTRL and oxygen consumption was maintained through the second hour postexercise (CTRL: male, 0.410 +/- 0.048; female, 0.332 +/- 0.062; cycle: male, 0.430 +/- 0.047; female, 0.395 +/- 0.087; run: male, 0.463 +/- 0.051; female, 0.374 +/- 0.087 L.min(-1)). The total EPOC was not significantly different between modes of exercise or males and females (P > 0.05). Our data demonstrate that the mode of exercise during SIT (cycling or running) is not important to O-2 consumption and that males and females respond similarly.