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Adaptive changes in hypercapnic ventilatory response during training and detraining.

M Miyamura1, K Ishida

  • 1Laboratory for Work Physiology, Nagoya University, Japan.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1990
PubMed
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Regular physical training enhances aerobic capacity and reduces CO2 ventilatory responsiveness. This effect is reversible upon detraining, as shown by changes in hypercapnic ventilatory response.

Area of Science:

  • Exercise Physiology
  • Respiratory Physiology

Background:

  • Understanding the long-term effects of physical training and detraining on physiological responses is crucial.
  • CO2 chemosensitivity plays a vital role in respiratory regulation.

Purpose of the Study:

  • To investigate the impact of prolonged physical training and subsequent detraining on CO2 chemosensitivity.
  • To assess changes in hypercapnic ventilatory response over a 6-year period.

Main Methods:

  • Longitudinal study tracking five subjects over 6 years.
  • Measurement of maximal pulmonary ventilation (VEmax) and maximal oxygen uptake (VO2max) during exercise.
  • Assessment of resting ventilatory response to carbon dioxide (CO2) using Read's rebreathing method.

Main Results:

Related Experiment Videos

  • Physical training led to significant increases in VEmax and VO2max.
  • CO2 ventilatory responsiveness (slope S) significantly decreased with training.
  • Detraining resulted in a significant increase in CO2 ventilatory responsiveness, reversing training adaptations.

Conclusions:

  • Long-term physical training enhances aerobic capacity and diminishes CO2 ventilatory responsiveness in healthy individuals.
  • The observed ventilatory adaptations due to training are reversible upon cessation of exercise.