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The constant work rate critical power protocol overestimates ramp incremental exercise performance.

Matthew I Black1,2, Andrew M Jones1, James A Kelly1

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|October 28, 2016
PubMed
Summary

Critical power (CP) and curvature constant (W') estimates from constant work-rate trials overestimate ramp exercise performance. This suggests CP and W' derived from different work-rate forcing functions should not be used interchangeably for performance prediction.

Keywords:
Critical powerPerformance predictionPower-duration relationshipW′

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • The power-duration relationship, defined by critical power (CP) and curvature constant (W'), theoretically predicts exercise performance above CP.
  • CP and W' are linked to oxygen uptake ([Formula: see text]O2) kinetics, which can be influenced by work-rate manipulation.
  • Understanding the interplay between CP, W', and exercise performance is crucial for optimizing training and predicting outcomes.

Purpose of the Study:

  • To test the hypothesis that CP and W' derived from constant work-rate (CWR) trials would overestimate performance in ramp incremental exercise.
  • To investigate the relationship between CP, W', and the accuracy of performance predictions.
  • To determine if CP and W' estimates are interchangeable across different exercise protocols.

Main Methods:

  • Thirty participants (28 males, 2 females) completed a ramp incremental test and 3-5 CWR prediction trials.
  • CP and W' were determined from CWR trials to predict performance on the ramp incremental test.
  • Fifty-one ramp test performances were analyzed using multiple CWR estimates and ramp tests.

Main Results:

  • CP and W' estimates from CWR trials significantly overestimated ramp incremental test performance (729 ± 113 s vs. 751 ± 114 s and 749 ± 111 s).
  • The prediction error was inversely correlated with the magnitude of W' for both best and worst individual fits.
  • This indicates that the accuracy of performance prediction is influenced by the individual's W' value.

Conclusions:

  • The overestimation of ramp incremental performance highlights that CP and W' derived from different work-rate forcing functions are not interchangeable.
  • Different [Formula: see text]O2 kinetics associated with varying protocols can lead to inaccuracies in performance prediction.
  • These findings are important for researchers and practitioners to avoid potential errors in exercise performance prediction.