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Related Experiment Videos

Respiratory oxygen cost for dead space challenge is characteristically increased during exercise in patients with

T Kurotobi1, H Sato, H Yokoyama

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

Journal of Cardiac Failure
|October 23, 1997
PubMed
Summary

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Increased respiratory muscle work does not limit exercise capacity in chronic heart failure patients. Dead space challenge showed that higher respiratory muscle workload did not worsen exercise tolerance or dyspnea in these patients.

Area of Science:

  • Cardiopulmonary Physiology
  • Exercise Physiology

Background:

  • Respiratory muscle work is elevated during exercise in chronic heart failure (CHF) patients.
  • The contribution of increased respiratory muscle workload to exercise intolerance in CHF is debated.

Purpose of the Study:

  • To investigate the effects of external dead space on exercise ventilation, gas exchange, and exercise capacity in CHF patients.
  • To determine if increased respiratory muscle work impacts exercise limitations in CHF.

Main Methods:

  • Dead space challenge was employed by adding external dead space to the airway during maximal bicycle exercise.
  • Measurements included respiratory gas exchange, exercise time, anaerobic threshold, and perceived dyspnea (Borg scale).
  • The study included 20 CHF patients and 10 healthy controls.

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Main Results:

  • External dead space increased minute ventilation by ~25% and systemic oxygen uptake by ~20% in CHF patients, indicating increased respiratory muscle work.
  • This increase in respiratory muscle work did not exacerbate aerobic exercise capacity or exertional dyspnea in CHF patients.
  • Normal subjects did not show a similar increase in oxygen uptake.

Conclusions:

  • Dead space challenge is a useful technique to increase respiratory muscle work during exercise in CHF.
  • Increased respiratory muscle work is not a significant factor limiting exercise capacity in patients with chronic heart failure.