A study from the University of Connecticut shows that caffeinated drinks are safe for most people when they exercise. When you take caffeinated drinks such as coffee, tea or cola and do not exercise, the caffeine can act as a diuretic and drain fluid from your body. However, during exercise, caffeine does not increase urination, so it does not take fluid from your body.
Caffeine also can help you exercise longer. Your muscles get much of their energy from sugar that they store inside their fibers. When a muscle runs out of its stored sugar, it hurts and cannot contract as effectively. Caffeine raises blood levels of a fat called triglycerides, causes the muscles to burn more fat for energy and thus spares the sugar inside muscles to prolong endurance. So drinks containing caffeine can help increase endurance during exercise.
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