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[Relationship between anaerobic threshold and breathlessness during exercise].

N Kurihara1, H Matsushita, K Wakayama

  • 1First Department of Internal Medicine, Osaka City University Medicine School, Japan.

Nihon Kyobu Shikkan Gakkai Zasshi
|April 1, 1992
PubMed
Summary

Exercise and breathlessness are linked to the anaerobic threshold (AT). This study found that AT significantly increases breathlessness, especially with respiratory loading, suggesting enhanced respiratory motor commands.

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Area of Science:

  • Exercise Physiology
  • Respiratory Medicine
  • Pulmonary Rehabilitation

Context:

  • Investigating the physiological mechanisms underlying breathlessness during incremental exercise.
  • Examining the role of respiratory system impedance in perceived breathlessness.
  • Comparing responses in individuals with chronic lung diseases (CLD) and healthy subjects.

Purpose:

  • To determine the association between the anaerobic threshold (AT) and increased breathlessness during exercise.
  • To evaluate the impact of inspiratory resistive loading (IRL) on this association.
  • To identify physiological parameters most responsible for changes in breathlessness.

Summary:

  • Incremental exercise in CLD patients and healthy subjects revealed that the anaerobic threshold (AT) is closely linked to a significant increase in breathlessness.

Related Experiment Videos

  • This increase in breathlessness, quantified by the modified Borg scale (psi), was more pronounced under inspiratory resistive loading (IRL).
  • A strong linear correlation was observed between mouth occlusion pressure (P0.1), an indicator of respiratory motor output, and breathlessness, with an inflection point at the AT.

    • Impact:

    • The findings suggest that the anaerobic threshold (AT) plays a crucial role in the perception of breathlessness during exercise.
    • Enhanced respiratory motor command, indicated by P0.1, appears to be a key mechanism linking AT to increased breathlessness.
    • This research provides insights for managing breathlessness in patients with respiratory conditions during physical activity.