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Related Experiment Videos

Dyspnea and leg effort during incremental cycle ergometry.

K J Killian1, E Summers, N L Jones

  • 1Department of Medicine, McMaster University Medical Centre, Hamilton, Ontario, Canada.

The American Review of Respiratory Disease
|June 1, 1992
PubMed
Summary

Normal subjects experience increased dyspnea and leg effort during maximal exercise tests. These sensations are influenced by sex, age, and height, but normalize when exercise intensity is expressed as a percentage of maximal capacity.

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Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Symptom Perception Research

Background:

  • Understanding the perception of exertional symptoms is crucial in exercise science.
  • Standardized exercise tests help quantify physiological and perceptual responses.
  • Previous research has explored factors influencing dyspnea and leg effort, but comprehensive analysis across demographics is needed.

Purpose of the Study:

  • To determine the perceived magnitude of dyspnea and leg effort in healthy individuals during incremental exercise to maximal capacity.
  • To investigate the influence of sex, age, and height on these perceived symptoms.
  • To analyze the relationship between exercise intensity and symptom perception.

Main Methods:

  • A standardized incremental exercise test to maximal capacity was administered to 460 healthy subjects (297 male, 163 female, aged 20-70).

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  • Perceived exertion and dyspnea were rated using the Borg scale (0-10).
  • Statistical analysis explored correlations between symptom ratings and demographic/exercise variables.

    • Main Results:

    • Leg effort and dyspnea increased with power output, were higher in females than males, increased with age, and decreased with height.
    • When normalized to % maximal power output (%MPO), both symptoms increased non-linearly and demographic factors did not contribute to ratings.

    Conclusions:

    • Sex, age, and height significantly impact perceived leg effort and dyspnea at absolute exercise intensities.
    • Normalizing exercise intensity to %MPO provides a consistent measure of symptom perception across diverse individuals.
    • The Borg scale effectively quantifies perceptual responses during maximal exercise.