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Heart rate, blood pressure and repolarization effects of an energy drink as compared to coffee
Author(s) -
Brothers R. Matthew,
Christmas Kevin M.,
Patik Jordan C.,
Bhella Paul S.
Publication year - 2017
Publication title -
clinical physiology and functional imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.608
H-Index - 67
eISSN - 1475-097X
pISSN - 1475-0961
DOI - 10.1111/cpf.12357
Subject(s) - medicine , blood pressure , heart rate , caffeine , qt interval , anesthesia , zoology , cardiology , biology
Summary The goal of this study was to investigate the impact of energy drinks on haemodynamic and cardiac physiology. Comparisons were made to coffee as well as water consumption. In Protocol #1 the caffeine content was normalized to body weight to represent a controlled environment. Heart rate, blood pressure and cardiac QT c interval were assessed in 15 participants, on 4 days, prior to and for 6·5 h postconsumption of (i) energy drink (2 mg caffeine per kg body weight; low dose), (ii) energy drink (3 mg caffeine per kg body weight; medium dose), (iii) coffee (2 mg caffeine per kg body weight) and (iv) 250 ml water. In Protocol #2, the beverages were consumed in volumes that they are purchased to represent real‐life conditions. The aforementioned measurements were repeated in 15 participants following (i) 1 16 oz can of energy drink (16 oz Monster), (ii) 1 24 oz can of energy drink (24 oz Monster), (iii) 1 packet of Keurig K‐Cup Starbucks coffee (coffee) and (iv) 250 ml water. The order of the beverages was performed in a randomized double‐blinded fashion. For both protocols, QT c interval, heart rate and systolic blood pressure were unchanged in any condition ( P> 0·05). Diastolic blood pressure and mean blood pressure were slightly elevated in Protocol #1 ( P< 0·05, main effect of time) with no difference between beverages ( P< 0·05, interaction of beverage × time); however, they were unaffected in Protocol #2 ( P> 0·05). These findings suggest that acute consumption of these commonly consumed beverages has no negative effect on cardiac QT c interval.