A study published online November 2, 2026 in the *Journal of Strength and Conditioning Research* under the title *The Respiratory Compensation Point Predicts 19.2-km Cycling Performance in Trained Male Cyclists* put 28 trained male cyclists through a virtual 19.2-kilometer time trial on their own bikes attached to smart trainers.

Each rider also completed physiological testing using a specialized step-ramp-step (SRS) protocol before and after the effort. The task: find which of four candidate measurements best predicted finishing time in an effort lasting roughly 30 minutes.

VO₂max has long been the most recognizable badge of aerobic fitness, so a result demoting it raises eyebrows.

In this study, relative power at the respiratory compensation point — watts per kilogram at that threshold — correlated with time trial time at -0.61, while relative VO₂peak managed only -0.42.

TodoMountainBike reports that two cyclists with nearly identical aerobic capacities can produce very different 30-minute time trial results, and the difference may be better explained by power at a specific metabolic threshold than by peak oxygen uptake alone.

Fatigue resistance, measured through pre- and post-trial ramp-test power, showed no significant correlation at all.

In the multivariable analysis, the RCP measurement uniquely accounted for 30.9% of the model's predictive variance, with cycling economy contributing 21.3% — statistical contributions to the prediction model, not expected training gains.

The respiratory compensation point is identified during a cardiopulmonary exercise test, where breathing begins rising disproportionately in response to the acid-base disturbance of intense exercise, and it is generally associated with the second ventilatory threshold, VT2.

TodoMountainBike notes the SRS protocol matters as much as the variable itself: it corrects for the lag between displayed workload and oxygen uptake that can distort conventional ramp tests.

For riders who organize training around FTP, the practical takeaway is caution rather than revolution. Power meters record mechanical output and heart rate monitors track cardiovascular response, but neither directly measures the gas-exchange patterns needed to identify RCP.

TodoMountainBike cautions that RCP is not interchangeable with lactate threshold, critical power, or FTP, and the study never compared RCP against FTP as competing predictors — so it does not show cyclists should replace power-based zones.

A laboratory metabolic test with gas analysis may add useful context when FTP and VO₂peak look inconsistent with actual race results.

The caveats are real: 28 trained male participants, one virtual distance, no women, recreational riders, or pros, and no comparison with outdoor racing conditions like aerodynamics and pacing.

The study was observational — a strong correlation does not prove that training to raise RCP will independently cause proportional performance gains.

TodoMountainBike says the core contribution is narrower: among the variables assessed, RCP power was the strongest independent correlate of roughly 30-minute time trial performance.

It lands in a week of training-science revision — Outside Magazine separately reported that fragmented, short-burst strength sessions matched one long session for strength gains.