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The effects of substrate utilization, manipulated by caffeine, on post-exercise oxygen consumption in untrained female subjects.

Chad, K.; Quigley, D.

Eur J Appl Physiol 1989(1-2)L 48-54

The effect of substrate utilization manipulated by caffeine on post-exercise oxygen consumption was investigated in five untrained females (age = 21 +/- 1.5 years), following 90 minutes of treadmill walking at 55% maximal oxygen consumption. Each subject participated in the two trials =(control and experimental) within 2 weeks of each other. Immediately following the measurement of resting oxygen consumption, subjects consumed one of the two test beverages 60 minutes prior to exercise: 5mg of caffeine per kg of body-weight in 200 ml of orange juice (CA) or 200 ml of orange juice (C). Assignment of CA and C was made in a random, double blind fashion. Immediately prior to the exercise phase (0 minutes) resting oxygen consumption was again measured. Following exercise, subjects returned to the same pre-exercise sitting position where respiratory data was collected over 1 hour. No significant differences were found in resting oxygen consumption and respiratory exchange ratio prior to caffeine ingestion (-60 min). One hour after caffeine ingestion oxygen consumption and free fatty acid (FFA) levels increased significantly compared to C. During and 1 hour following exercise, oxygen consumption and FFA levels were significantly greater, with R values being significantly lower in CA compared to C. These findings provide further evidence that metabolic substrate is somehow implicated in elevating oxygen consumption following exercise cessation.

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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