Aerobic high-intensity intervals are superior to improve V̇O compared with sprint intervals in well-trained men.

Maximal oxygen uptake (V̇O ) may be the single most important factor for long-distance running performance. Interval training, enabling high intensity, is forwarded as the format that yields the largest increase in V̇O . However, it is uncertain if an optimal outcome on V̇O , anaerobic capacity, and running performance is provided by training with a high aerobic intensity or high overall intensity.