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Ventilatory responses during incremental exercise in men under hyperoxic conditions

Y Miyamoto1, K Niizeki

  • 1Department of Electrical and Information Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Japan.

The Japanese Journal of Physiology
|January 1, 1995
PubMed
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Carotid chemoreceptors influence breathing during exercise. Hyperoxia, or breathing 50% oxygen, alters ventilatory responses and heart rate, suggesting non-chemoreceptor factors regulate breathing during heavy exercise.

Area of Science:

  • Exercise Physiology
  • Respiratory Physiology
  • Cardiovascular Physiology

Background:

  • Carotid chemoreceptors play a crucial role in regulating breathing.
  • Understanding ventilatory control during exercise is essential for optimizing performance and health.
  • Incremental exercise provides a graded stimulus to assess cardiorespiratory responses.

Purpose of the Study:

  • To investigate the role of carotid chemoreceptors in breathing regulation during incremental exercise.
  • To examine the effects of hyperoxia on ventilatory and cardiovascular responses during exercise.
  • To identify factors influencing hyperpnea (increased breathing) during heavy exercise.

Main Methods:

  • Healthy young men performed incremental exercise (0-300 W) while breathing air (normoxia) and 50% oxygen (hyperoxia).

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  • Measurements included minute ventilation (VE), oxygen uptake (VO2), carbon dioxide output (VCO2), end-tidal PO2 and PCO2, and heart rate (HR).
  • Analysis focused on changes in VE, VE/VCO2, and HR in relation to work rate under both conditions.

    • Main Results:

    • Hyperoxia altered the ventilatory response (VE) during exercise, showing a more linear increase compared to normoxia.
    • The buffering of end-tidal PCO2 (PETCO2) occurred at higher work rates in hyperoxia.
    • Both VE and HR increased with a steeper slope at specific work rates under normoxic and hyperoxic conditions, correlating significantly.

    Conclusions:

    • Carotid chemoreceptors may have a diminished role in hyperpnea during heavy exercise under hyperoxic conditions.
    • Factors independent of peripheral chemoreceptors appear to influence both ventilatory and circulatory systems during heavy exercise.
    • The findings suggest a complex interplay of factors regulating breathing and heart rate during strenuous physical activity.