Related Experiment Videos
Hypoxic ventilatory response and arterial desaturation during heavy work.
1Department of Sports Science, University of British Columbia, Vancouver, Canada.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|September 1, 1989
Summary
Arterial desaturation in athletes during intense exercise is not linked to respiratory drive. This study found no correlation between hypoxic drives and exercise ventilation or oxygen saturation levels in healthy males.
Area of Science:
- Exercise Physiology
- Respiratory Physiology
- Sports Medicine
Background:
- Athletes experience arterial desaturation during intense exercise, but its cause is unclear.
- A blunted respiratory drive has been suggested as a contributing factor to inadequate pulmonary ventilation.
Purpose of the Study:
- To investigate the relationship between the ventilatory response to hypoxia, exercise ventilation, and arterial desaturation in athletes.
- To determine if hypoxic drives influence maximal exercise ventilation or arterial oxygen saturation.
Main Methods:
- 12 healthy males performed a 5-minute treadmill test at 100% maximal oxygen uptake (VO2max).
- Arterial blood gases and ventilatory data were collected, and alveolar PO2 was calculated.
- Ventilatory response to isocapnic hypoxia was measured separately.
Main Results:
- Arterial PO2 decreased significantly, leading to arterial desaturation (SaO2 92.0%).
- Alveolar-arterial gas pressure difference increased, indicating impaired gas exchange.
- No significant correlation was found between hypoxic drives and ventilation-to-VO2max ratio or SaO2.
Conclusions:
- Hypoxic drives do not appear to be related to maximal exercise ventilation.
- Hypoxic drives are not associated with the development of arterial desaturation during maximal exercise in healthy athletes.