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Conducting Maximal and Submaximal Endurance Exercise Testing to Measure Physiological and Biological Responses to Acute Exercise in Humans
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The exercise intensity at maximal oxygen uptake (i⩒O2max): Methodological issues and repeatability.

Kevin L Merry1, Mark Glaister2, Glyn Howatson3,4

  • 1a People and Organisational Development , De Montfort University , Leicester , UK.

European Journal of Sport Science
|June 2, 2016
PubMed
Summary
This summary is machine-generated.

The minimum exercise intensity eliciting VO2max (iVO2max) is repeatable using a single incremental test. This single test provides a reliable estimate of the true iVO2max, crucial for endurance performance assessment.

Keywords:
Cycle ergometryexercise intensitymaximal oxygen uptakerepeatability

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Cardiovascular Health

Background:

  • The minimum exercise intensity that elicits maximal oxygen uptake (VO2max), known as iVO2max, is a key predictor of endurance performance.
  • Standard incremental exercise tests may yield variable iVO2max due to differences in test protocols, such as increment magnitude and duration.

Purpose of the Study:

  • To assess the test-retest reliability of iVO2max determined from a single maximal incremental cycle ergometer test (iVO2max(S)).
  • To compare iVO2max(S) with a refined iVO2max value (iVO2max(R)) derived from repeated tests to determine if iVO2max(S) accurately represents the minimum intensity eliciting VO2max.

Main Methods:

  • Seventeen male cyclists underwent four maximal incremental cycle ergometer tests with 3-minute stages and 20W increments.
  • Tests 1 and 2 were identical to assess iVO2max(S) repeatability.
  • Tests 3 and 4 used different starting intensities to determine iVO2max(R).

Main Results:

  • iVO2max(S) demonstrated good test-retest repeatability for iVO2max (CV=4.1%, ICC=0.93), VO2max (CV=6.3%, ICC=0.88), and test duration (CV=6.7%, ICC=0.89).
  • No significant difference was found between iVO2max(S) (303±40W) and iVO2max(R) (301±42W).

Conclusions:

  • A single maximal incremental exercise test reliably determines iVO2max in cyclists.
  • The iVO2max obtained from a standard incremental test is a valid and repeatable measure of the minimum intensity required to elicit VO2max.