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Variations in Ramp Slope Affect the Prediction of W´ from a Single Incremental Test.

Lena Stuer1,2, Kobe Van Rie1, Jan Boone1

  • 1Department of Movement and Sports Sciences, Ghent University, Ghent, BELGIUM.

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

Ramp incremental tests underestimate W´ (work capacity above critical power), regardless of ramp slope. Adding a supra-critical power work bout may reduce this underestimation but introduces significant variability in W´ estimation.

Keywords:
CRITICAL POWEREXERCISE TESTOXYGEN UPTAKE KINETICSSLOW COMPONENT

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Critical Power (CP) and W´ (work capacity above CP) are key physiological metrics.
  • Accurate determination of W´ is crucial for training prescription and performance prediction.
  • Ramp incremental (RI) tests are a common method for assessing exercise capacity.

Purpose of the Study:

  • To evaluate the accuracy of different ramp slopes in RI tests for predicting W´.
  • To test the hypothesis that steeper ramp slopes underestimate W´ and shallower slopes provide accurate estimates.

Main Methods:

  • Thirteen healthy men performed RI tests with varying ramp slopes (10, 30, and 50 W·min-1).
  • CP and W´ were conventionally determined using constant work rate (CWR) tests.
  • W´ was estimated from RI tests (W´R) and compared to CWR values (W´CWR).
  • A supra-CP work bout was added post-RI test to calculate total W´ (W´T).

Main Results:

  • All RI test slopes (10, 30, 50 W·min-1) significantly underestimated W´CWR.
  • W´ estimated from RI tests (W´R30, W´R10, W´R50) showed significant underestimation.
  • Total W´ (W´T_R30, W´T_R10, W´T_R50) did not differ significantly from W´CWR but showed high variability.

Conclusions:

  • RI tests consistently underestimate W´ compared to traditional CWR methods, irrespective of ramp slope.
  • Incorporating a supra-CP work bout post-RI test can mitigate underestimation but does not eliminate variability.
  • The findings suggest caution when using RI tests alone for precise W´ determination.