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Validity of a customized submaximal treadmill protocol for determining VO2max.

Cody J Strom1, Robert W Pettitt2, Luke M Krynski3

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European Journal of Applied Physiology
|June 28, 2018
PubMed
Summary

A new customized treadmill test (CustomTM) accurately estimates maximum oxygen uptake (VO2max) and is more time-efficient than the Bruce protocol. This CustomTM offers superior agreement for VO2max assessment in exercise physiology research.

Keywords:
Bruce protocolMaximum oxygen uptakeTreadmill testingVO2 slow component

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Area of Science:

  • Exercise Physiology
  • Cardiorespiratory Fitness Assessment
  • Sports Science

Background:

  • Submaximal exercise testing is crucial for estimating maximal oxygen uptake (VO2max).
  • Previous research indicated a customized cycle ergometry test surpassed traditional methods for VO2max estimation.
  • A validated submaximal treadmill protocol is needed for accurate VO2max assessment.

Purpose of the Study:

  • To validate a customized submaximal treadmill test (CustomTM) against the established Bruce submaximal protocol.
  • To compare the accuracy and efficiency of the CustomTM with the Bruce protocol for VO2max estimation.

Main Methods:

  • Participants (n=50) underwent a graded exercise test (GXT) and an exhaustive verification bout to determine "true" VO2max.
  • Subjects completed both the CustomTM and Bruce submaximal protocols in a counterbalanced order.
  • The CustomTM protocol involved two 3-minute stages at 35% and 70% of estimated VO2max.

Main Results:

  • Both CustomTM and Bruce protocols showed no significant difference from "true" VO2max.
  • The CustomTM demonstrated a "very large" measurement agreement (ICC=0.78) with "true" VO2max, outperforming the Bruce protocol (ICC=0.62).
  • The CustomTM was more time-efficient and exhibited better agreement and lower technical error of estimate compared to the Bruce protocol.

Conclusions:

  • The customized submaximal treadmill test (CustomTM) is a superior method for estimating VO2max compared to the Bruce protocol.
  • The CustomTM's effectiveness stems from including stages above and below the gas exchange threshold, enhancing accuracy.
  • The CustomTM offers a more time-efficient and accurate approach to VO2max assessment in clinical and research settings.