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In this context, caffeine can increase the heart beats of many organisms. Caffeine binds to receptors on the surface of heart muscle cells which leads to an increase in the level of cAMP inside the cells which then increases the heart rate. This creates an overall effect to increase the rate of glycolysis and the amount of ATP available for muscle contraction and relaxation.
Can caffeine cause heart problems? About three weeks ago I chugged one of those energy drinks and almost immediately after my left shoulder started hurting and i was having chest pains. A few hours later my heart started beating irregularly. I kind of pushed this aside. Then for about 2 weeks my left arm, jaw, neck, chest and back all hurt.