An Evaluation of the Predictive Validity and Reliability of Ventilatory Threshold

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Why the study?

Which ventilatory threshold determination method is most valid and reliable for predicting 40-km time trial performance in cyclists?

Population

50 cyclists with high aerobic capacity.

Design

Cross-sectional

Follow-up

48 hours (for test-retest reliability)

Authors

Discussion

May support VE/VO2 for 40K power prediction in cyclists; extends validity data but leaves open prospective comparisons.

Which ventilatory threshold determination method is most valid and reliable for predicting 40-km time trial performance in cyclists?

Population

50 cyclists (Part 1: two subsets of N=15 each; Part 2: N=20) with high aerobic capacity (VO2max ranging from 64.8 to 71.5 mL/kg/min).

Intervention

Ventilatory threshold (VT) determination using various methods (breakpoint of VE/VO2, breakpoint of VE/VCO2, V-slope, RER = 1, and RER = 0.95).

Outcome

Predictive validity (correlation with 40-km time trial average power output) and test-retest reliability of ventilatory threshold methods.surrogate

The VE/VO2 method is a highly reliable and valid laboratory measure for predicting 40-km time trial performance in cyclists.

Amann et al. (2004) studied this question.

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