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Purpose <p>This study introduces the Ramp Above Critical Level Endurance Test (RACLET), a novel method for evaluating critical power model parameters, and tests its reliability and concurrent validity. </p> Methods <p> Twenty-three participants completed several RACLET and time-to-exhaustion tests (TTE). The RACLET is based on the proportionnality between the decline in maximal power (fatigability) and the work done above the critical power and involves a decreasing power ramp with intermittent maximal sprints, inducing moderate fatigue without exhaustion. </p> Results <p>The test demonstrated reliability for the initial power (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(P_i\)</EquationSource> </InlineEquation>) and critical power (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(P_c\)</EquationSource> </InlineEquation>) (ICC &gt; 0.97), and for the time constant (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(\tau\)</EquationSource> </InlineEquation>) (ICC = 0.70). The concurrent validity against TTE for <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(P_i\)</EquationSource> </InlineEquation> and <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(P_c\)</EquationSource> </InlineEquation> showed systematic errors of 1.7% and 3.0%, respectively, and for <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(\tau\)</EquationSource> </InlineEquation> and maximum work above the critical power, systematic errors were approximately 10%. The RACLET predictive capacity for time-to-exhaustion showed a systematic error of -0.6% and a random error of 10.3%. </p> Conclusion <p>These results suggest that the RACLET is a reliable, valid, and efficient alternative to traditional critical power testing methods, offering comparable accuracy with a single test without inducing exhaustion. This approach could be particularly beneficial for populations in which exhaustive testing is challenging or impractical.</p>

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RACLET: the Ramp Above Critical Level Endurance Test to evaluate critical power in cycling

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Maximilien Bowen,
  • Pierre Samozino,
  • Mylène Vonderscher,
  • Baptiste Morel

摘要

Purpose

This study introduces the Ramp Above Critical Level Endurance Test (RACLET), a novel method for evaluating critical power model parameters, and tests its reliability and concurrent validity.

Methods

Twenty-three participants completed several RACLET and time-to-exhaustion tests (TTE). The RACLET is based on the proportionnality between the decline in maximal power (fatigability) and the work done above the critical power and involves a decreasing power ramp with intermittent maximal sprints, inducing moderate fatigue without exhaustion.

Results

The test demonstrated reliability for the initial power ( \(P_i\) ) and critical power ( \(P_c\) ) (ICC > 0.97), and for the time constant ( \(\tau\) ) (ICC = 0.70). The concurrent validity against TTE for \(P_i\) and \(P_c\) showed systematic errors of 1.7% and 3.0%, respectively, and for \(\tau\) and maximum work above the critical power, systematic errors were approximately 10%. The RACLET predictive capacity for time-to-exhaustion showed a systematic error of -0.6% and a random error of 10.3%.

Conclusion

These results suggest that the RACLET is a reliable, valid, and efficient alternative to traditional critical power testing methods, offering comparable accuracy with a single test without inducing exhaustion. This approach could be particularly beneficial for populations in which exhaustive testing is challenging or impractical.