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Breathing during exercise: demands, regulation, limitations.

H V Forster1, L G Pan

  • 1Department of Physiology, Medical College of Wisconsin, Milwaukee 53226.

Advances in Experimental Medicine and Biology
|January 1, 1988
PubMed
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Mammals adjust alveolar ventilation (VA) during exercise, but species differ. Humans maintain near-constant PaCO2, while horses exhibit hypocapnia. Exercise hyperpnea efficiency is key, but can be compromised in elite athletes and horses at high workloads.

Area of Science:

  • Exercise Physiology
  • Respiratory Control
  • Comparative Mammalian Physiology

Background:

  • Alveolar ventilation (VA) in humans is tightly regulated to match metabolic demands during mild to moderate exercise, maintaining PaCO2 homeostasis.
  • Most other mammals, like horses, exhibit hypocapnia and alkalosis with increasing exercise intensity.
  • Species-specific hyperventilation responses during exercise are observed, suggesting different physiological control mechanisms.

Purpose of the Study:

  • To investigate the mechanisms underlying species differences in ventilatory responses to exercise.
  • To explore the origins of the metabolic ventilatory stimulus during exercise, considering neural and humoral factors.
  • To examine the role of respiratory system efficiency and potential compromises in alveolar ventilation during high-intensity exercise.

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Main Methods:

  • Comparative analysis of alveolar ventilation (VA) and arterial blood gases (PaCO2, PaO2) across different mammalian species during various exercise intensities.
  • Investigation of potential ventilatory control mechanisms, including neural (central command, peripheral afferents) and humoral pathways.
  • Assessment of respiratory system mechanics and efficiency, including airway modulation and respiratory muscle recruitment, using techniques like helium breathing to reduce impedance.

Main Results:

  • Humans maintain PaCO2 homeostasis during exercise, unlike equines which show progressive hypocapnia.
  • Heavy exercise induces hyperventilation in most species, leading to hypocapnia and improved PaO2 homeostasis.
  • Contrary to traditional views, lactacidosis may not be the primary driver of hyperventilation in heavy exercise; neural and humoral factors are implicated.
  • Respiratory system efficiency, involving airway modulation and optimized breathing patterns, minimizes the oxygen cost of breathing.
  • In elite human athletes and galloping racehorses, high workloads can compromise VA, leading to hypoxemia, which is alleviated by reducing respiratory impedance.

Conclusions:

  • Species exhibit distinct ventilatory strategies during exercise, with humans prioritizing PaCO2 stability and others, like horses, prioritizing PaO2 homeostasis.
  • The control of exercise hyperpnea involves complex neural and humoral pathways, with the precise stimulus remaining debated.
  • While respiratory system efficiency is generally maintained, extreme exercise can compromise VA, highlighting the trade-off between metabolic demand and breathing mechanics.