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A new 3-minute all-out cycling test using power-to-body-mass ratio (3MT(%BM)) accurately determines critical power (CP) and finite work capacity (W') in a single visit, offering a valid alternative for exercise physiology assessments.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Critical Power (CP) and finite work capacity above CP (W") are key physiological metrics for assessing endurance exercise capacity.
  • Traditional methods for determining CP and W" often require multiple laboratory visits and complex protocols.

Purpose of the Study:

  • To investigate the validity of a novel power-to-body-mass ratio 3-minute all-out cycling test (3MT(%BM)) for determining CP and W'.
  • To compare the 3MT(%BM) protocol against established methods for CP and W" determination.

Main Methods:

  • Twelve participants underwent cycle ergometry to determine gas-exchange threshold (GET), maximal oxygen uptake (VO2max), and associated power outputs (W(peak), W(GET)).
  • CP and W" were calculated using the traditional "linear factor" 3-minute all-out test (3MT(rpm^2)) and the new 3MT(%BM) protocol.
  • The 3MT(%BM) utilized body mass and self-reported physical activity rating (PA-R), with data analyzed via linear regression of work-time and power-inverse-time models.

Main Results:

  • Estimated VO2max, W(peak), and W(GET) using PA-R and non-exercise regression equations did not significantly differ from actual measurements.
  • Estimates of CP and W" derived from 3MT(%BM), 3MT(rpm^2), work-time, and 1/time models showed no significant differences.
  • The 3MT(%BM) demonstrated strong correlations with the 1/time and work-time models for CP determination (r = .96).

Conclusions:

  • The 3MT(%BM) is a valid and reliable single-visit protocol for determining critical power (CP) and finite work capacity (W").
  • This new protocol offers a practical and efficient alternative for assessing key exercise physiology parameters.