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Special considerations while measuring oxygen saturation01:19

Special considerations while measuring oxygen saturation

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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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Conventional testing methods produce submaximal values of maximum oxygen consumption.

Fernando G Beltrami1, Christian Froyd, Alexis R Mauger

  • 1Exercise Sciences and Sports Medicine Unit, Human Biology Department, University of Cape Town, Cape town, South Africa. fernando.beltrami@uct.ac.za

British Journal of Sports Medicine
|December 15, 2011
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Summary

A novel exercise protocol challenges the idea that a plateau in oxygen consumption indicates maximal cardiovascular capacity. Results show higher oxygen consumption during a decremental test, suggesting the plateau may not represent a systemic limit.

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Area of Science:

  • Exercise Physiology
  • Cardiovascular System
  • Sports Science

Background:

  • The traditional understanding posits that a plateau in oxygen consumption (VO(2 max)) during maximal exercise testing signifies the cardiovascular system's peak oxygen transport capacity.
  • This study investigates this widely accepted concept using a novel testing protocol.

Purpose of the Study:

  • To test the hypothesis that a plateau in oxygen consumption (VO(2 max)) during incremental exercise testing to exhaustion represents the maximal capacity of the cardiovascular system to transport oxygen.
  • To explore whether alternative exercise testing protocols yield different VO(2 max) values.

Main Methods:

  • Twenty-six subjects were divided into a reverse group and a control group, matched for initial VO(2 max).
  • The reverse group underwent an incremental test (INC(1)), a verification test (VER), a decremental test (DEC), and a final incremental test (INC(F)).
  • The control group performed only incremental tests to compare VO(2 max) stability.

Main Results:

  • VO(2 max) remained stable in the control group across trials (p=0.93).
  • The reverse group exhibited a significantly higher VO(2 max) during the decremental test (DEC) compared to the initial incremental test (INC(1)) (4.4% higher, p=0.004).
  • VO(2 max) was also significantly higher during the final incremental test (INC(F)) compared to INC(1) (p=0.01), despite similar exercise durations.

Conclusions:

  • The findings challenge the established concept that a plateau in VO(2 max) during incremental and verification tests indicates a systemic limitation in oxygen utilization.
  • The higher VO(2 max) observed during the decremental test and subsequent incremental test suggests that the "plateau" may not represent the absolute maximal cardiovascular capacity.
  • The precise physiological reasons for the elevated VO(2) following the decremental test require further investigation.