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Caffeine ingestion attenuates the VO(2) slow component during intense exercise
1Departamento de Ciencias Morfológicas y Fisiología, Universidad Europea de Madrid, Madrid, Spain.
The Japanese Journal of Physiology
|February 16, 2002
Summary
Caffeine ingestion significantly reduced the slow component of oxygen uptake (DeltaVO(2)) during high-intensity endurance exercise. This suggests caffeine
Area of Science:
- Exercise Physiology
- Sports Science
- Nutritional Biochemistry
Background:
- Caffeine is a widely used ergogenic aid.
- Its effects on oxygen uptake (VO(2)) during intense exercise require further elucidation.
- The slow component of VO(2) reflects metabolic inefficiency.
Purpose of the Study:
- To investigate the impact of caffeine on the slow component of oxygen uptake (DeltaVO(2)).
- To determine if caffeine attenuates VO(2) slow component during high-intensity endurance exercise.
Main Methods:
- Nine healthy subjects performed two 9-minute treadmill tests at 90% VO(2 max).
- Subjects ingested either a placebo or caffeine (5 mg/kg body mass) 60 minutes prior to testing.
- Oxygen uptake (VO(2)) and its slow component (DeltaVO(2)) were measured.
Main Results:
- The slow component of oxygen uptake (DeltaVO(2)) was significantly lower following caffeine ingestion compared to placebo (83 +/- 31 ml/min vs. 167 +/- 26 ml/min, p < 0.05).
- This indicates a reduced metabolic cost during exercise.
Conclusions:
- Caffeine ingestion may attenuate the VO(2) slow component during high-intensity endurance exercise.
- This attenuation could contribute to the known ergogenic effects of caffeine.
- Further research is warranted to confirm the mechanisms involved.