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Related Experiment Videos

Skeletal muscle chemoreflex and pHi in exercise ventilatory control

D A Oelberg1, A B Evans, M I Hrovat

  • 1Pulmonary and Critical Care Unit, Massachusetts General Hospital, Boston, USA.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|February 26, 1998
PubMed
Summary

Skeletal muscle acidity, not blood pH, appears to drive breathing during exercise. This study found that increased hydrogen ions in muscles directly correlated with higher ventilation, suggesting a key role for muscle chemoreflexes in exercise responses.

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Area of Science:

  • Exercise Physiology
  • Muscle Metabolism
  • Respiratory Control

Background:

  • The role of skeletal muscle metabolites in regulating breathing during exercise is not fully understood.
  • Investigating the contribution of muscle hydrogen ions to ventilatory drive is crucial for understanding exercise physiology.

Purpose of the Study:

  • To determine if skeletal muscle hydrogen ion concentration mediates ventilatory drive in humans during exercise.
  • To explore the relationship between muscle intracellular pH and minute ventilation.

Main Methods:

  • 12 healthy subjects performed isotonic submaximal quadriceps exercise.
  • 31P-magnetic resonance spectroscopy (31P-MRS) measured vastus medialis intracellular pH (pHi).
  • Positive pressure cuffs were used to accentuate muscle chemoreflex during exercise or recovery.

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Main Results:

  • Exercise with accentuated chemoreflex (BLPPex) resulted in higher minute ventilation compared to recovery (BLPPrec).
  • BLPPex led to lower arterialized PCO2 and more acidic quadriceps pHi.
  • Muscle intracellular pH (pHi) showed a linear relationship with minute ventilation, but arterialized pH did not.

Conclusions:

  • Skeletal muscle hydrogen ions contribute to the exercise ventilatory response.
  • The findings suggest that muscle acidity, rather than arterial pH, is a significant factor in ventilatory control during exercise.