Physiological, perceptual and neuromuscular responses of team sport athletes to short duration high intensity...

To examine the acute physiological, perceptual and neuromuscular responses of team sport athletes to two volume-matched cycling high intensity interval training (HIIT) sessions with short work bouts (< 60 s).

Using and randomised crossover design, 16 male team sport players completed 2 × 6 min (with 5 min between sets) repeated efforts of 15 s or 30 s exercising at 120% power at $\dot{\text{V}}$ O_{2 max} (p $\dot{\text{V}}$ O_{2 max}) followed by matched-duration passive recovery on a cycle ergometer.

Absolute mean $\dot{\text{V}}$ O₂ (p = 0.0257) and relative mean $\dot{\text{V}}$ O₂ (p = 0.0275) were higher in 15 s than 30 s HIIT. Total time at > 90% $\dot{\text{V}}$ O_{2 max} during the HIIT was higher for 15 s compared to 30 s HIIT (p = 0.0257). Heart rate remained the same between trials (p = 0.805) as did oxygen pulse (p = 0.1161). B[La] was lower in 15 s compared to 30 s HIIT (p = 0.0257). Differences in dRPE-L (p = 0.0495), dRPE-B (p = 0.0495) and dRPE-O (p = 0.1837) suggested lower perceived exertion in 15 s compared to 30 s HIIT. Maximal isometric knee extension force revealed a greater reduction after 30 s HIIT (p = 0.0495).

Team sport athletes using short duration cycling-based HIIT should use 15 s work intervals to elicit greater time working near $\dot{\text{V}}$ O_{2 max} at a lower perceived exertion and with smaller reductions in peak muscle force after exercise.