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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.
So people who have fast arrhythmias should avoid caffeine-containing foods. Caffeine can make symptoms such as palpitations stronger and more noticeable. Since caffeine is a stimulant, it speeds up your heart rate, making your heart beat even faster and making symptoms like chest pain or lightheadedness worse. In some cases, large amounts of caffeine can even trigger a new episode of an arrhythmia by irritating your heart's conduction system.