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Establishing the V̇O 2 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.

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