n International SportMed Journal - Effect of caffeine intake on blood pressure and heart rate variability after a single bout of aerobic exercise : original research article



The consumption of a dose of caffeine (CAF) may attenuate post-exercise hypotension. The purpose was to verify the effect of a dose of CAF on systolic (SBP) and diastolic blood pressure (DBP), mean arterial pressure (MAP), heart rate (HR) and heart rate variability (HRV) after a session of aerobic exercise in normotensive individuals. Randomized controlled study. Ten healthy, physically active men (24.4 ± 4.5yrs; 74.3 ± 11.8kg; 172.8 ± 8.6m; 36.8 ± 5.7ml.kg-1.min-1) were randomly submitted to two experimental protocols in distinct days, in a cross-over double-blind design, with the ingestion of 4mg.kg-1of CAF or placebo and performance of an aerobic exercise in a cycle ergometer at 60% VO. SBP, DBP, MAP, HR and HRV components were assessed at the pre-exercise rest period, 60 min after substance ingestion and during 60min post-exercise. At the post-ingestion period, there were reductions on basal HR on both sessions and mean rises of 5mmHg on SBP, of 7-8mmHg on DBP and of 6-7mmHg on MAP on the caffeine session. After exercise, there were reductions of 5-7mmHg on SBP, significant on the 30th and 40th min, on the placebo session. During the caffeine session, maintenance of raised HR levels, no difference in relation to the pre-exercise period for SBP and MAP, and higher blood pressure compared to the placebo session. HRV was altered in each session; however there were no differences between the experimental sessions. The ingestion of a 4mg.kg-1dose of CAF apparently does not significantly interfere on the cardiovascular behaviour after a session of aerobic exercise.


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