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The purpose of the present research is to study the effect of caffeine consumption with different doses on blood lactate and glucose levels after middle-distance running (1500 and 800meter run) . The participants of the present research include 15 middle-distance runners of Tehran province, Iran, who had participated in the national tournaments. The height, weight, and body fat of the subjects were measured on the first day of the research. In the first stage, subjects received placeboes at three intervals (30 minutes before, 5 minutes before, and immediately after the 1500 and 800-meter run). In the second and third stages (with a 5-day interval between each two stages), all the subjects received caffeine gum with two different doses (180 and 300 mg) at three intervals (30 minutes before, 5 minutes before, and immediately after the 1500 and 800-meter run). Blood glucose and lactate of the subjects were measured in all three stages, 5 minutes before and immediately after performing the 1500 and 800-meter run. Gum and placebo were given to the participants in a double-blind fashion. Descriptive statistics, analysis of variance with repeated measures, and Tukey’s post hoc test were used for data analysis (p≤0.05). The results of the present research indicated that none of the doses of caffeine had a significant effect on blood lactate and glucose levels both before and after the middle-distance exercise and during the 1500 and 800-meter run any judgment regarding consumption of caffeine by middle-distance runners, especially in the form of gums, requires further investigations.

The Effect of Caffeine Supplementation on Blood Lactate and Glucose after 800 and 1500 meter Run