Email updates

Keep up to date with the latest news and content from JISSN and BioMed Central.

Journal App

google play app store
Open Access Highly Accessed Research article

Dose response effects of a caffeine-containing energy drink on muscle performance: a repeated measures design

Juan Del Coso*, Juan José Salinero, Cristina González-Millán, Javier Abián-Vicén and Benito Pérez-González

Author Affiliations

Exercise Physiology Laboratory, Camilo José Cela University, C/ Castillo de Alarcon, 49, Villafranca del Castillo 28692, Spain

For all author emails, please log on.

Journal of the International Society of Sports Nutrition 2012, 9:21  doi:10.1186/1550-2783-9-21

Published: 8 May 2012

Abstract

Background

Energy drinks have become the most used caffeine-containing beverages in the sport setting. The aim of this study was to determine the effects of two doses of a caffeine-containing energy drink on muscle performance during upper- and lower-body power-load tests.

Methods

In a randomized order, twelve active participants ingested 1 and 3 mg of caffeine per kg of body weight using a commercially available energy drink (Fure®, ProEnergetics) or the same drink without caffeine (placebo; 0 mg/kg). After sixty minutes, resting metabolic rate, heart rate and blood pressure were determined. Then, half-squat and bench-press power production with loads from 10 to 100% of 1 repetition maximum was determined using a rotator encoder.

Results

In comparison to the placebo, the ingestion of the caffeinated drink increased mean arterial pressure (82 ± 7 < 88 ± 8 ≈ 90 ± 6 mmHg for 0 mg/kg, 1 mg/kg, 3 mg/kg of caffeine, respectively; P < 0.05) and heart rate (57 ± 7 < 59 ± 8 < 62 ± 8 beats/min, respectively; P < 0.05) at rest in a dose response manner, though it did not affect resting metabolic rate. While the ingestion of 1 mg/kg of caffeine did not affect maximal power during the power-load tests with respect to the placebo, 3 mg/kg increased maximal power in the half-squat (2554 ± 167 ≈ 2549 ± 161 < 2726 ± 167 W, respectively; P < 0.05) and bench-press actions (349 ± 34 ≈ 358 ± 35 < 375 ± 33 W, respectively; P < 0.05).

Conclusions

A caffeine dose of at least 3 mg/kg in the form of an energy drink is necessary to significantly improve half-squat and bench-press maximal muscle power.

Keywords:
Caffeine; Sports nutrition; Force production; Exercise; Energy expenditure