Investigating left myocardial function (P<0.0001). Interestingly, in another investigation

Investigating the Effects of Caffeine on Heart Rate

Literature review

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Caffeine, (1, 3, 7-trimethylxanthine),
is a stimulant to the central nervous system and its cardiovascular effects have
been a subject of study for many years. As the most commonly consumed psychoactive
drug, there is frequent concern that caffeine has an effect on blood pressure
and heart rate. Despite this, research on the cardiovascular effects has
produced generally inconsistent results.

Experimental studies on the
effects of caffeine on blood pressure show that caffeine consumption leads to
small rises in systolic and diastolic blood pressure.  A Mayo Clinic study on the effects of a
popular energy drink used 25 healthy young adults between the ages of 19 and 40
who were alternately given an energy drink or a placebo, after which blood
pressure and heart rate were measured. Results were compared between regular
caffeine drinkers and those who were not regular caffeine drinkers. The results
show that the subjects had a considerable rise in blood pressure and that the
increase was greater than 50% for those who were non habitual caffeine consumers
as compared to regular caffeine drinkers (Mayo Clinic, 2015).  In a similar study researching the effects of
energy drinks on myocardial function, rather than just the blood pressure and
heart rate being assessed, blood pressure, electrocardiographic and
echocardiographic examination were carried out on a larger sample of 35 healthy
subjects (Cameli et al., 2013). In
this study however, the placebo used did not contain the same level of sugar as
the energy drink used. The results showed that there was significant increase
in right and left myocardial function (P

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