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[Control of breathing during exercise].

T Yoshida1, Y Fukuba

  • 1Exercise Physiology Laboratory, Faculty of Health Science, Osaka University.

The Annals of Physiological Anthropology = Seiri Jinruigaku Kenkyukai Kaishi
|September 1, 1992
PubMed
Summary
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Exercise hyperpnea involves rapid neural and slower humoral mechanisms. Ventilation control ensures gas exchange matches metabolic demands, maintaining acid-base balance during exercise.

Area of Science:

  • Physiology
  • Exercise Physiology
  • Respiratory Control

Context:

  • The control of breathing during exercise (exercise hyperpnea) is complex, involving both neural and humoral factors.
  • Understanding how ventilation matches metabolic demands and maintains blood gas homeostasis during physical activity is crucial.

Purpose:

  • To explore the unresolved mechanisms of exercise hyperpnea, differentiating between neural and humoral control.
  • To investigate how pulmonary gas exchange is regulated to match tissue exchange rates during varying exercise intensities.

Summary:

  • Exercise hyperpnea exhibits distinct phases: an abrupt increase (Phase I) likely driven by neural signals, followed by a steady-state increase (Phase II) for gas exchange regulation.
  • During intense exercise, non-linear ventilation increases are linked to anaerobic metabolism, lactoacidosis, and potentially rising arterial potassium stimulating chemoreceptors.

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Impact:

  • Clarifies the interplay of neural and humoral factors in respiratory control during exercise.
  • Provides insights into the physiological adaptations that maintain acid-base balance and gas exchange efficiency under metabolic stress.