The researchers say high-caffeine energy drinks may provide more than an energy boost as they may also boost heart rates and blood pressure levels and increase the danger of blood clots.
The results of a small study by researchers from Detroit's Henry Ford Hospital has found that the high levels of caffeine and taurine, an amino acid found in protein-rich foods like meat and fish, can affect heart function and blood pressure and they say people who have high blood pressure or heart disease should avoid energy drinks because they could have an impact on their blood pressure or change the effectiveness of their medications.
For the study the group were asked not to consume other forms of caffeine for two days before and throughout the study in which they consumed two cans of energy drinks daily over seven days, each can containing 80 milligrams of caffeine and 1,000 milligrams of taurine.
The volunteers' heart rates rose by about 8 percent on the first day and 11 percent on the seventh day - systolic blood pressure rose by 8 percent on the first day and 10 percent on the seventh day, and diastolic blood pressure rose by 7 percent on the first day and 8 percent on the seventh day.
The researchers suggest the caffeine and taurine in the drinks were responsible for the changes.
Australian researchers from the Royal Adelaide Hospital say they have found that the sugar-free version of Red Bull may increase the danger of blood clots; they say it creates "sticky" blood, raising the risk of heart attack or stroke and warn that the drink "could be deadly" for people with heart abnormalities.
Lead researcher Dr. Scott Willoughby says though the incidence of sudden cardiac death is very low, the drink could be more deadly for people who have an unknown cardiovascular abnormality.
Sales of Red Bull last year reached 3.5 billion cans, sold in 143 countries.
Source-Medindia
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