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Caffeine's Effects on Athletic Performance

Titlow, L.W., Ishee, J.H., Riggs, C.E. J. Sports.  Sci 1991, Spring; 9 (1): 15-22

Caffeine consumption prior to athletic performance has become commonplace. The usual dosage is approximately 200mg, a level of caffeine ingestion equivalent to two cups of brewed coffee.  This study was designated to examine the effects of a common level of caffeine ingestion, specifically 200mg, on metabolism during submaximal exercise performance in five males. The subjects performed two 60-minute monitored treadmill workouts at 60% maximal heart rate during a 2-week period.  The subjects were randomly assigned, double-blind to receive a caffeine or placebo capsule 60-minutes prior to exercise.  Testing was performed in the afternoon following a midnight fast.  Venous blood was withdrawn pre-exercise, every 15 minutes during the workout, and 10 minutes after recovery.  Blood was analysed for free fatty acid, triglycerides, glucose, lactic acid, haemoglobin and haematocrit.  The respiratory exchange ration (R), perceived exertion (RPE) and oxygen uptake were measured every 4-minutes during exercise.  An examination of the data with repeated-measures ANOVA revealed no significant differences between the two groups.  Within the limitations of the study, it was concluded that 200mg of caffeine failed to affect metabolism during the 60-minute exercise.

Note from The Tea Man:

Therefore, 1 cup of coffee = approximately 3 cups of black tea, 4 cups of semi-black tea and 5 cups of green tea

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