The team from the University of Bonn in Germany imaged the hearts of 17 people an hour after they had an energy drink. The study showed contractions were more forceful after the drink was consumed.
They showed the chamber of the heart that pumps blood around the body, the left ventricle, was contracting harder an hour after the energy drink was taken than at the start of the study.
Dr Dorner added: “We’ve shown that energy drink consumption has a short-term impact on cardiac contractility.
“We don’t know exactly how or if this greater contractility of the heart impacts daily activities or athletic performance.”
Source: BBC News