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Related Experiment Video

Updated: May 31, 2026

Experimental Protocol of a Three-minute, All-out Arm Crank Exercise Test in Spinal-cord Injured and Able-bodied Individuals
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Experimental Protocol of a Three-minute, All-out Arm Crank Exercise Test in Spinal-cord Injured and Able-bodied Individuals

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High Test-Retest Reliability but Questionable Validity: Assessing a Step-Ramp-Step Protocol to Estimate Critical

Quentin Rousseau1,2,3, Giuseppe Rabita1, Emmanuel Brunet2

  • 1French Institute of Sport (INSEP), Laboratory "Sport, Expertise and Performance" (EA 7370), Paris, FRANCE.

Medicine and Science in Sports and Exercise
|February 3, 2026
PubMed
Summary
This summary is machine-generated.

The modified Step-Ramp-Step (mod-SRS) protocol reliably measures key endurance variables like V̇O2peak, GET, and RCP. However, corrected power output at the respiratory compensation point (PORCP) underestimated critical power (CP), affecting W' calculations.

Keywords:
CRITICAL POWERRAMP-INCREMENTAL EXERCISERESPIRATORY COMPENSATION POINTTEST–RETEST RELIABILITY

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Last Updated: May 31, 2026

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Critical Power (CP) and W' are crucial physiological metrics for endurance athletes.
  • Accurate measurement of these parameters is essential for effective training prescription.
  • The modified Step-Ramp-Step (mod-SRS) protocol is a novel approach to assess these variables.

Purpose of the Study:

  • To evaluate the concurrent validity of CP and W' measurements using the mod-SRS protocol against established methods.
  • To determine the test-retest reliability of endurance variables derived from the mod-SRS protocol.
  • To compare power output at the respiratory compensation point (PORCP) with CP and assess W' depletion above PORCP (W'mod-SRS).

Main Methods:

  • Twelve trained male triathletes completed a Step-Ramp-Step (SRS) protocol, severe-intensity Constant-Work Rate (CWR) trials, and two mod-SRS protocols for reliability testing.
  • CP and W' were calculated using a "best individual fit" method.
  • PORCP was corrected, and W'mod-SRS was computed as energy depleted above PORCP; reliability was assessed using ICC, SEM, and CV.

Main Results:

  • CP was consistently higher than corrected PORCP (bias = 19 ± 19 W and 17 ± 20 W).
  • W' and W'mod-SRS showed no significant bias between trials (bias = -2.8 ± 7.9 kJ and -5.4 ± 8.8 kJ).
  • Moderate reliability was found for W'mod-SRS (ICC = 0.66), while high reliability was observed for V̇O2peak, GET, RCP, and their associated power outputs (ICCs = 0.85-0.95).

Conclusions:

  • The mod-SRS protocol demonstrates high reliability for measuring V̇O2peak, GET, and RCP.
  • Corrected PORCP systematically underestimates CP, impacting the accuracy of W' calculations within the mod-SRS protocol.
  • The mod-SRS protocol design may facilitate a more complete assessment of energy availability above RCP, potentially eliciting V̇O2peak.