The purpose of this study was to characterise the relationship between running velocity and the time for which a subject can run at maximal oxygen uptake (V̇O(2max)), (t(lim) V̇O(2max)). Seven physical education students ran in an incremental test (3-min stages) to determine V̇O(2max) and the minimal velocity at which it was elicited (νV̇O(2max)). They then performed four all-out running tests on a 200-m indoor track every 2 days in random order. The mean times to exhaustion t(lim) at 90%, 100%, 120% and 140% νV̇O(2max) were 13 min 22 s (SD 4 min 30 s), 5 min 47 s (SD 1 min 50 s), 2 min 11 s (SD 38 s) and 1 min 12 s (SD 18 s), respectively. Five subjects did not reach V̇O(2max) in the 90% νV̇O(2max) test. All the subjects reached V̇O(2max) in the runs at 100% νV̇O(2max). All the subjects, except one, reached V̇O(2max) in the runs at 120%νV̇O(2max). Four subjects did not reach V̇O(2max) in the 140% νV̇O(2max) test. Time to achieve V̇O(2max) was always about 50% of the time to exhaustion irrespective of the intensity. The time to exhaustion-velocity relationship was better fitted by a 3-than by a 2-parameter critical power model for running at 90%, 100%, 120%, 140% νV̇O(2max) as determined in the previous incremental test. In conclusion, t(lim) V̇O(2max) depended on a balance between the time to attain V̇O(2max) and the time to exhaustion t(lim). The time to reach V̇O(2max) decreased as velocity increased. The t(lim) V̇O(2max) was a bi-phasic function of velocity, with a peak at 100% νV̇O(2max).
- Critical power model
- Oxygen uptake kinetics