Physiological and cognitive responses to caffeine during repeated, high-intensity exercise

Crowe, Melissa J., Leicht, Anthony S., and Spinks, Warwick L. (2006) Physiological and cognitive responses to caffeine during repeated, high-intensity exercise. International Journal of Sport Nutrition and Exercise Metabolism, 16 (5). pp. 528-544.

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Abstract

This study investigated the effects of caffeine on repeated, anaerobic exercise using a double-blind, randomized, crossover design. Seventeen subjects (five female) underwent cognitive (reaction time, number recall) and blood (glucose, potassium, catecholamines, lactate) testing before and after consuming caffeine (6 mg/kg), placebo, or nothing (control). An exercise test (two 60 s maximal cycling bouts) was conducted 90 min after caffeine/placebo consumption. Plasma caffeine concentrations significantly increased after caffeine ingestion, however, there were no positive effects on cognitive or blood parameters except a significant decrease in plasma potassium concentrations at rest. Potentially negative effects of caffeine included significantly higher blood lactate compared to control and significantly slower time to peak power in exercise bout 2 compared to control and placebo. Caffeine had no significant effect on peak power, work output, RPE, or peak heart rate. In conclusion, caffeine had no ergogenic effect on repeated, maximal cycling bouts and may be detrimental to anaerobic performance.

Item ID: 3960
Item Type: Article (Research - C1)
ISSN: 1543-2742
Keywords: ergogenic; anaerobic; performance; methylxanthine; catecholamines
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Date Deposited: 17 Nov 2009 01:06
FoR Codes: 11 MEDICAL AND HEALTH SCIENCES > 1106 Human Movement and Sports Science > 110602 Exercise Physiology @ 70%
11 MEDICAL AND HEALTH SCIENCES > 1106 Human Movement and Sports Science > 110604 Sports Medicine @ 30%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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