Modified Sprint Interval Training Protocols Part I: Physiological Responses

Adaptations to sprint interval training (SIT) are observed with brief (≤15s) work bouts highlighting peak power generation as an important metabolic stimulus. This study examined the effects of manipulating SIT work bout and recovery period duration on energy expenditure (EE) during and post-exercise, as well as post-exercise fat oxidation rates. Nine active males completed a resting control session (CTRL) and three SIT sessions in randomized order: 1) 30:240 (4 x 30 s bouts, 240 s recovery); 2) 15:120 (8 x 15 s bouts, 120 s recovery); 3) 5:40 (24 x 5 s bouts, 40 s recovery). Protocols were matched for the total duration of work (2 min) and recovery (16 min), as well as the work-to-recovery ratio (1:8 s). EE and fat oxidation rates were derived from gas exchange measured before, during, and for 3 h post-exercise. All protocols increased EE versus CTRL (PThe accepted manuscript in pdf format is listed with the files at the bottom of this page. The presentation of the authors' names and (or) special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript; that in the pdf file of the accepted manuscript is what was submitted by the author