Masters Thesis

Cardiovascular Responses to Caffeine

The purpose of this study is to identify the relationship between caffeine ingestion and its effect on blood pressure and heart rate. This study uses 15 female college students between the ages of 21 and 30 that were submitted to = two protocols for two cycling sessions one week apart: 400 mg of Caffeine and Placebo, consisting of blood pressure and heart rate readings at Baseline (pre-capsule time), Pre-exercise time before cycle ergometer session, Mid-exercise time during cycle ergometer session, Post-exercise (immediate) time at the end of cycle ergometer session, Post-exercise (15 min) time, Post-exercise (30 min) time, Post-exercise (60 min) time, Post-exercise (90 min) time, and Post-exercise (120 min) time. a power level of 70% of HRmax was recorded for the first session and duplicated for the second exercise session a week later. the second exercise session was identical to the first except the other capsules were taken for the second session. Caffeine was found to have no effect on blood pressure or heart rate before, during, or after exercise. a 2 x 9 repeated measures ANOVA was used to analyze heart rate, systolic blood pressure, and diastolic blood pressure. the results of this analysis can be used to further investigate if a possible safe increase in caffeine dosage will increase blood pressure and heart rate before, during, or after exercise which then can indicate possible negative cardiovascular responses due to caffeine.

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