The effects of varying high intensity interval training (HIIT) and sprint interval training (SIT) frequency on 1.5 mile (2.4km) run performance in Air Force ROTC cadets were studied. Twenty-seven cadets (21.6 ± 2.8 years) were stratified then randomly assigned to 3 groups: a high frequency group (HF) that performed HIIT/SIT 3x week, a low frequency group (LF) that performed HIIT/SIT 2x week, and a continuous training group (CG) that performed moderate intensity training 3x week. HIIT workouts

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... nsisted of 4 x 3 min intervals at 90-100% of velocity at maximal oxygen consumption (vVO2 max) with 4 min of active recovery between sets. SIT workouts consisted of 4 x 30s all out sprints with 4 min active recovery between sets. Baseline 1.5 mile run performance was measured, then retested at 6 and 10 weeks. At the end of 6 weeks, all groups significantly improved in mean 1.5 mile run time (LF, 7.3% + 4.2, p