Why the study?
Does 100 or 200 mg of oral caffeine alter heart rate variability in young, healthy male habitual caffeine consumers?
Does 100 or 200 mg of oral caffeine alter heart rate variability in young, healthy male habitual caffeine consumers?
Modest amounts of oral caffeine (100-200 mg) do not acutely affect heart rate variability within 90 minutes in young, healthy male habitual consumers.
Modest caffeine doses leave HRV unchanged acutely; confirms neutral effect on autonomic function in young healthy male consumers.
During the last years, heart rate variability (HRV) has become a promising risk factor for cardiovascular events. However, the effect of caffeine on HRV in habitual caffeine consumers has barely been investigated. Therefore, we treated 30 male habitual caffeine users in a randomized double-blinded crossover study design with either placebo, 100 or 200 mg caffeine orally and determined parameters of HRV under resting conditions and metronomic breathing. As result, we could not detect significant differences in HRV parameters up to 90 min after drug ingestion. We conclude that modest amounts of caffeine do not reveal negative nor positive effects on HRV within the first 90 min after drug ingestion in young and healthy habitual caffeine consumers. However, further research is necessary to determine the effects of caffeine on HRV in habitual caffeine users, healthy as well as suffering from diabetes, hypertension and postmyocardial infarction.
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Rauh et al. (2006) studied this question.
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