Physiological Adaptations to Sprint Interval Training with Matched Exercise Volume.

Purpose: To determine how high-intensity interval training (HIIT) protocols featuring matched times but distinct sprint durations affect cardiorespiratory and metabolic responses and performance. Methods: Thirty-eight recreationally active men (aged 21 +/- 2 years) were assigned to one of three interval training groups: long-duration high-intensity (HIIT60s; 8 x 60-s at 85%-90% V[spacing dot above]O2max; 120-s recovery at 30% V[spacing dot above]O2max), short-duration high-intensity (HIIT10s; 48 x 10-s at 85%-90% V[spacing dot above]O2max; 20-s recovery at 30% V[spacing dot above]O2max), and control (CON; regular physical activity without HIIT). Before and after a 4-wk training period (3 sessions per week), participants performed graded exercise tests and repeated-sprint tests, based on which their aerobic and anaerobic capacities were assessed. Skinfold thickness, blood and metabolic responses were also measured before and after intervention. Results: After 4-wk training, V[spacing dot above]O2max was significantly increased (P 0.05), but testosterone concentration in the HIIT10s was higher after training than before (P

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