Caffeine ingestion attenuates the VO(2) slow component during intense exercise.
The purpose of this study was to analyze the effects of caffeine ingestion on the slow component of oxygen uptake (DeltaVO(2)) during high-intensity endurance exercise. Nine subjects (8 male and 1 female; age: 21 +/- 1 years; VO(2 max): 57.9 +/- 1.5 ml kg(-1) min(-1)) performed two 9-min tests on a treadmill at a running velocity eliciting 90% of their VO(2 max), 60 min after ingesting either a placebo capsule (PLAC) or a capsule containing a caffeine dose of 5 mg (kg body mass)(-1) [CAFF]. The mean values of DeltaVO(2) were significantly lower in CAFF than in PLAC (83 +/- 31 ml min(-1) vs. 167 +/- 26 ml min(-1), respectively; p < 0.05). These findings suggest that the ergogenic effect of caffeine in a high-intensity endurance exercise shown in previous research may be partly mediated by a possible attenuation of the VO(2) slow component.
Santalla
A
A
Departamento de Ciencias Morfológicas y Fisiología, Universidad Europea de Madrid, Madrid, Spain.
Lucía
A
A
Pérez
M
M
D000328:Adult; D002110:Caffeine / Q000008:administration & dosage*; D000697:Central Nervous System Stimulants / Q000008:administration & dosage*; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000187:drug effects*; D010807:Physical Endurance / Q000187:drug effects*; D011659:Pulmonary Gas Exchange / Q000187:drug effects
D000697:Central Nervous System Stimulants; D002110:Caffeine