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VO2max, protocol duration, and the VO2 plateau.

Byung-Kon Yoon1, Len Kravitz, Robert Robergs

  • 1Exercise Physiology Laboratories, Exercise Science Program, The University of New Mexico, Albuquerque, NM 87131-1251, USA.

Medicine and Science in Sports and Exercise
|June 29, 2007
PubMed
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The optimal test duration for measuring maximal oxygen uptake (VO2max) in fit individuals is 8–10 minutes. Shorter or longer protocols may affect results, especially in men.

Area of Science:

  • Exercise Physiology
  • Cardiorespiratory Fitness Assessment

Background:

  • Maximal oxygen uptake (VO2max) is a key indicator of cardiorespiratory fitness.
  • Standardizing incremental exercise test protocols is crucial for accurate VO2max determination.

Purpose of the Study:

  • To compare VO2max, VO2-time slopes, and VO2 plateau presence across varying incremental cycling test durations (5, 8, 12, 16 min).
  • To determine the optimal protocol duration for VO2max assessment in moderately to highly trained individuals.

Main Methods:

  • Eight male and eight female subjects of moderate to high fitness levels participated.
  • Subjects completed incremental cycling tests to VO2max with four different protocol durations.
  • VO2max, VO2-time slopes, and VO2 plateau were analyzed.

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Main Results:

  • VO2max was significantly higher in men (4.23 L.min-1) than women (2.84 L.min-1).
  • For men, the 8-min protocol yielded the highest VO2max, but this significance was removed when using the highest VO2max as a covariate.
  • The VO2 slope in the final 30s was lower for the 16-min protocol compared to the 5-min protocol for both sexes.

Conclusions:

  • An 8 to 10-minute protocol duration is recommended for VO2max testing in healthy, moderately to highly trained individuals.
  • Protocol duration influences the assessment of VO2max and the determination of a VO2 plateau.