[Skip to Content]
Access to paid content on this site is currently suspended due to excessive activity being detected from your IP address Please contact the publisher to request reinstatement.
[Skip to Content Landing]
Comment & Response
May 10, 2016

Hemodynamic Responses to Energy Drink Consumption—Reply

Author Affiliations
  • 1Division of Cardiovascular Diseases, Mayo Clinic, Rochester, Minnesota
JAMA. 2016;315(18):2018-2019. doi:10.1001/jama.2016.1115

In Reply Dr Grasser and colleagues discuss the importance of longer postdrink blood pressure and heart rate observation periods and suggest that water would have been a more appropriate placebo drink.

First, with regard to duration of observation, our protocol was designed to follow closely the metabolism and bioavailability of caffeine. Oral absorption of caffeine from the intestinal tract is rapid and caffeine becomes completely bioavailable, reaching a peak plasma concentration 30 minutes after ingestion, whereas plasma half-life ranges from 3 to 10 hours.1