Related Experiment Videos
Bicarbonate attenuates arterial desaturation during maximal exercise in humans
Henning B Nielsen1, Per P Bredmose, Morten Strømstad
1The Copenhagen Muscle Research Center, Department of Anesthesia, Rigshospitalet, DK-2100 Copenhagen, Denmark. h.bay@dadlnet.dk
Journal of Applied Physiology (Bethesda, Md. : 1985)
|July 23, 2002
Summary
Alkalinizing blood with sodium bicarbonate (Bic) attenuated acidosis and arterial oxygen desaturation during maximal exercise. This intervention improved exercise performance by mitigating the negative effects of pH changes on oxygen delivery.
Area of Science:
- Exercise Physiology
- Biochemistry
- Sports Science
Background:
- Exercise-induced acidosis can impair oxygen delivery and exercise performance.
- Understanding the role of pH in exercise-induced arterial oxygen desaturation is crucial for optimizing athletic performance.
Purpose of the Study:
- To evaluate the contribution of pH to exercise-induced arterial oxygen desaturation.
- To investigate the effects of sodium bicarbonate (Bic) on blood pH and arterial oxygen saturation during maximal exercise.
Main Methods:
- Five male oarsmen underwent a "2,000-m" maximal ergometer row.
- Intravenous infusion of sodium bicarbonate (Bic) or saline (Sal) was administered.
- Blood-gas variables and muscle oxygenation were measured, with corrections for temperature changes.
Main Results:
- Sodium bicarbonate attenuated the decrease in blood pH during exercise (7.34 vs. 7.07).
- Arterial oxygen saturation reduction was less pronounced with Bic (94.1% vs. 89.0%).
- Pulmonary ventilation was reduced, while arterial PCO2 increased with Bic infusion.
Conclusions:
- Increased blood buffering capacity with sodium bicarbonate mitigates acidosis.
- This attenuation of acidosis reduces arterial oxygen desaturation during maximal exercise.
- Sodium bicarbonate may enhance exercise performance by improving oxygen availability.