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A physiological description of critical velocity
1Department of Kinesiology, University of North Texas, Denton 76203-1337, USA. dhill@coefs.coe.unt.edu
European Journal of Applied Physiology and Occupational Physiology
|February 27, 1999
Summary
Critical velocity (CV) indicates aerobic fitness. This study found that CV represents the exercise intensity threshold above which maximal oxygen uptake (VO2max) can be achieved during exhaustive exercise.
Area of Science:
- Exercise Physiology
- Sports Science
- Human Performance
Background:
- Critical velocity (CV) is a recognized measure of aerobic capacity.
- The precise physiological meaning of CV in relation to maximal oxygen uptake (VO2max) remains unclear.
Purpose of the Study:
- To determine the physiological significance of critical velocity (CV).
- To investigate the relationship between CV and the attainment of VO2max during exhaustive exercise.
Main Methods:
- Twelve participants completed exhaustive running tests at intensities ranging from 95% to 110% of their VO2max velocity.
- Critical velocity (CV) was calculated using time to exhaustion.
- A novel parameter, CV', was calculated based on the time to achieve VO2max at each velocity.
Main Results:
- CV and CV' were found to be statistically equal (238+/-24 m x min(-1) vs. 239+/-25 m x min(-1)).
- A strong correlation (r = 0.97, p < 0.01) was observed between CV and CV'.
- VO2max could not be elicited during exercise at or below the CV' intensity.
Conclusions:
- Critical velocity (CV) is physiologically significant as it defines the intensity threshold for VO2max attainment.
- Exercise performed above CV, for a sufficient duration, will lead to the achievement of VO2max.
- CV serves as a critical marker for aerobic function and exercise intensity prescription.