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Establishing the V̇O2 versus constant-work rate relationship from ramp-incremental exercise: Simple strategies for an unsolved problem.

The dissociation between constant-work rate V̇O2 and ramp-V̇O2 at a given work rate might be mitigated during slow increasing ramp-protocols. This study characterized the V̇O2 dynamics in response to five different ramp-protocols and constant-work rate trials at the maximal metabolic steady-state (MMSS), to characterize i) the V̇O2 gain (G) in the moderate, heavy, and severe domains, ii) the mean response time of V̇O2 (MRT), iii) the work rates at lactate threshold (LT) and respiratory compensation-point (RCP). Eleven young individuals performed five ramp-tests (5, 10, 15, 25, 30 W·min-1), 4-5 time-to-exhaustions for critical power estimation, and 2-3 constant-work rate trials for confirmation of the work rate at MMSS. G was greatest during the slowest ramp, and progressively decreased with increasing ramp-slopes (from ~12 to ~8 ml·min-1·W-1) (P<0.05). The MRT was smallest during the slowest ramp-slopes and progressively increased with faster ramp-slopes (1±1, 2±1, 5±3, 10±4, 15±6 W, P<0.05). After "left-shifting" the ramp-V̇O2 by the MRT, the work rate at LT was constant regardless of the ramp-slope (~150W) (P>0.05). The work rate at MMSS was 215±55W and was similar and high correlated with the work rate at RCP during the 5 W·min-1 ramp (P>0.05) (r = 0.99; CCC = 0.99; bias = -3 W; RMSE = 6W). Findings showed that the dynamics of V̇O2 (i.e., G) during ramp-exercise explain the apparent dichotomy existing with constant-work rate exercise. When these dynamics are appropriately "resolved", LT is constant regardless of the ramp-slope of choice and RCP and MMSS display minimal variations between each other.