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Critical power: How different protocols and models affect its determination.

Felipe Mattioni Maturana1, Federico Y Fontana2, Silvia Pogliaghi2

  • 1Faculty of Kinesiology, University of Calgary, Canada.

Journal of Science and Medicine in Sport
|December 6, 2017
PubMed
Summary
This summary is machine-generated.

Accurate critical power (CP) and work above CP (W') estimation in cyclists requires careful model selection and trial duration. The 3-parameter hyperbolic model (CP3-hyp) proved most accurate, with models using two trials between 12-20 minutes also showing good agreement.

Keywords:
Exercise intensity domainsLinear modelNonlinear modelPower–time relationshipTime-to-exhaustion

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biophysics

Background:

  • Critical Power (CP) and work above CP (W') are key physiological metrics for assessing endurance exercise capacity in cycling.
  • Estimating CP and W' relies on mathematical models, but inherent limitations and protocol design can lead to inaccuracies.
  • Overestimations of CP can occur, potentially misrepresenting an athlete's sustainable exercise threshold.

Purpose of the Study:

  • To compare the accuracy of five different models (exponential, 3-parameter hyperbolic, 2-parameter hyperbolic, linear, and linear 1/time) in estimating CP and W'.
  • To evaluate the impact of varying Time To Exhaustion (TTE) trial durations (1-20 minutes) on the accuracy of these models.
  • To identify the most reliable modeling approach for CP and W' estimation in cyclists.

Main Methods:

  • Thirteen healthy cyclists completed five separate TTE trials.
  • CP and W' were calculated using two, three, four, or five TTE trials with different models.
  • Model accuracy was assessed against a criterion method (CP3-hyp with five trials) using concordance correlation coefficient (CCC) and smallest worthwhile change (SWC) analyses.

Main Results:

  • CP was significantly overestimated when TTE trials shorter than 10 minutes were used, irrespective of the model.
  • The 3-parameter hyperbolic model (CP3-hyp) with five trials served as a reliable criterion method.
  • Several alternative models demonstrated near-perfect agreement with the criterion method, while others overestimated CP and underestimated W' when using short TTE trials (<12 minutes).

Conclusions:

  • The 3-parameter hyperbolic model (CP3-hyp) provides the most accurate CP and W' estimations, regardless of TTE trial duration.
  • Employing models that incorporate two TTE trials between 12 and 20 minutes offers good agreement with the criterion method for both CP and W'.