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Related Experiment Videos

Influence of testing protocol on ventilatory thresholds and cycling performance.

Markus Amann1, Andrew Subudhi, Carl Foster

  • 1The Orthopedic Specialty Hospital, Salt Lake City, UT 84121, USA. markus.amann@ihc.com

Medicine and Science in Sports and Exercise
|April 6, 2004
PubMed
Summary

The T25x1 incremental exercise test better predicts 40-km cycle time trial mean power output than the T50x3 test. The VE/VO2 method is a reliable predictor, independent of exercise protocol.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Cycling Performance

Background:

  • Incremental exercise tests are crucial for assessing physiological responses in athletes.
  • Understanding ventilatory thresholds (VT) aids in predicting endurance performance.
  • Different incremental test protocols may yield varying predictive accuracies for cycling time trials.

Purpose of the Study:

  • To compare the ventilatory response between two distinct incremental exercise tests (T50x3 and T25x1).
  • To evaluate the predictive validity of these tests on 40-km cycling time trial mean power output (40Kavgwatts).

Main Methods:

  • Fifteen male cyclists completed two incremental exercise tests (T50x3 and T25x1) and a 40-km time trial.
  • Power at ventilatory threshold (VT) was determined using multiple methods: VE/VO2, VE/VCO2 breakpoint, V-slope, RER=1, and RER=0.95.

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  • Regression analyses were performed to correlate test variables with 40Kavgwatts.

    • Main Results:

    • The T25x1 test yielded a significantly higher peak power output compared to the T50x3 test.
    • VT power outputs derived from T25x1 (at RER=1 and RER=0.95) were significantly higher than those from T50x3.
    • Both tests showed significant correlations with 40Kavgwatts, with T25x1-derived VT variables demonstrating superior predictive power (R2 up to 0.65).

    Conclusions:

    • The T25x1 incremental exercise test protocol is superior to the T50x3 protocol for predicting 40Kavgwatts.
    • The VE/VO2 method for determining VT is protocol-independent and a valid predictor of 40K cycling performance.
    • Specific VT determination methods (VE/VO2, V-slope, RER=0.95) showed no significant difference in predicting 40Kavgwatts.