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Related Experiment Video

Updated: Aug 28, 2025

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Interrater reliability of a customized submaximal cycle ergometer test.

M A Kantor1, S Fretti2, C Gubler3

  • 1Office of Research & Sponsored Projects, Rocky Mountain University of Health Professions, Provo, UT, 84601, USA.

European Journal of Applied Physiology
|September 22, 2022
PubMed
Summary
This summary is machine-generated.

The customized submaximal exercise testing (CSET) is a reliable and valid method for determining maximal oxygen uptake. This cycling protocol accurately estimates VO2 max and muscle oxygen saturation, proving useful in exercise science.

Keywords:
Graded exercise testingIndirect calorimetryNIRSSkeletal muscle oxygen saturation

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Cardiorespiratory Fitness Assessment

Background:

  • Graded exercise testing (GXT) is the standard for measuring maximal oxygen uptake (VO2 max).
  • Customized submaximal exercise testing (CSET) has emerged as a validated alternative for VO2 max estimation.
  • The reliability of CSET, particularly on cycle ergometry, requires further investigation.

Purpose of the Study:

  • To examine the interrater reliability of the customized submaximal exercise testing (CSET) using cycle ergometry.
  • To assess the validity of CSET in estimating maximal oxygen uptake (VO2 max).
  • To evaluate the utility of skeletal muscle oxygen saturation (SmO2) in corroborating exercise intensity domains.

Main Methods:

  • Thirteen participants completed a 2-stage, 3-minute CSET protocol administered by two separate testers.
  • Maximal oxygen uptake (VO2 max) was determined via a graded exercise test (GXT) and verification bout.
  • Skeletal muscle oxygen saturation (SmO2) was monitored using near-infrared spectrometry, with VO2 kinetics analyzed.

Main Results:

  • CSET demonstrated high agreement with "true" VO2 max, with excellent interrater reliability (ICC = 0.91).
  • Estimated VO2 max by both testers did not significantly differ from the "true" VO2 max.
  • A VO2 slow component and time-dependent decline in SmO2 were observed during the second CSET stage.

Conclusions:

  • The customized submaximal exercise testing (CSET) on a cycle ergometer is a reliable and valid procedure.
  • CSET provides accurate estimations of maximal oxygen uptake (VO2 max).
  • Skeletal muscle oxygen saturation (SmO2) monitoring is a valuable tool for confirming heavy-intensity exercise domains during CSET.