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Effect of exercise on acid-base status and ventilatory kinetics
M S Phatak1, G A Kurhade, S B Kaore
1Department of Physiology, Govt. Medical College, Nagpur.
Indian Journal of Physiology and Pharmacology
|September 19, 1998
Summary
Heavy exercise in young adults increases ventilation and causes temporary acidosis, leading to hyperpnoea. Respiratory and acid-base balance return to normal levels after a 10-minute rest period.
Area of Science:
- Exercise Physiology
- Respiratory Physiology
- Acid-Base Balance
Background:
- Understanding normal physiological responses to exercise is crucial for assessing health and performance.
- Strenuous physical activity significantly impacts respiratory and metabolic systems.
Purpose of the Study:
- To investigate the respiratory responses and acid-base status changes during and after maximal incremental exercise in healthy young adults.
- To determine the recovery time for these physiological parameters.
Main Methods:
- Twenty healthy subjects performed a progressive incremental treadmill exercise (Bruce protocol) to maximum capacity.
- Ventilatory parameters were measured using an Auto Spiro AS 300 spirometer.
- Arterialized venous blood gas analysis was performed using a NOVA stat profile 3 analyser.
Main Results:
- Significant increases in minute ventilation (VE), tidal volume (VT), and respiratory frequency (f) were observed (P<0.001).
- Exercise induced acidosis (decreased pH, P<0.05) with concurrent changes in blood gases (increased pO2, decreased pCO2, P<0.001).
- Recovery of acid-base status and blood gases to resting levels took 10 minutes post-exercise.
Conclusions:
- Heavy exercise in normal young adults leads to increased ventilatory kinetics and hyperpnoea.
- Exercise-induced acidosis stimulates the respiratory center, increasing ventilation to meet metabolic demands.
- Full physiological recovery of respiratory and acid-base parameters occurs within 10 minutes of rest.