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The 30-minute rest protocol accurately determines critical power (CP) and W' in athletes, comparable to a multi-visit approach. This method avoids confounding effects from prior strenuous exercise, ensuring reliable power-duration relationship assessments.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • The power-duration relationship, including critical power (CP) and W', is crucial for understanding endurance exercise capacity.
  • Accurate determination of these parameters is essential for effective training program design and performance prediction in athletes.
  • Previous protocols for assessing CP and W' have varied, with potential for confounding effects from exercise history.

Purpose of the Study:

  • To compare the systemic physiological responses between a 30-minute rest protocol and a multi-visit protocol for determining the power-duration relationship (CP and W').
  • To assess oxygen uptake kinetics and muscle deoxygenation during these different assessment protocols.
  • To evaluate the reliability and validity of the 30-minute rest protocol for CP and W' determination.

Main Methods:

  • Nine endurance-trained triathletes underwent a preliminary graded exercise test and familiarization.
  • Participants completed two protocols: a 30-minute single-visit protocol (10, 5, and 2-minute time trials with 30-min rest) and a multi-visit protocol (same time trials randomized with >24h rest).
  • Physiological measures included heart rate, respiratory gases (oxygen uptake kinetics), and muscle deoxygenation via near-infrared spectroscopy (NIRS); blood lactate was also measured.

Main Results:

  • No significant differences or meaningful effect sizes were observed for critical power (CP) and W' between the 30-minute rest protocol and the multi-visit protocol.
  • Most physiological parameters, including oxygen uptake kinetics and NIRS-derived measures, did not differ significantly between the two protocols, with the exception of blood lactate levels.
  • Significant differences were found across trials within each protocol for oxygen uptake amplitude, onset kinetics, NIRS parameters, blood lactate, and maximal heart rate.

Conclusions:

  • The 30-minute rest protocol is a valid and reliable method for determining critical power (CP) and W' in endurance-trained athletes.
  • This shorter protocol effectively measures the power-duration relationship without the confounding influence of previous strenuous exercise sessions inherent in multi-visit protocols.
  • The findings support the use of the 30-minute rest protocol for practical and efficient assessment of endurance exercise capacity parameters.