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How Caffeine Affects the Body. Caffeine stimulates heart rate through a well documented process in the cardiac cells. Caffeine blocks the enzyme phosphodiesterace, which normally actviates production of an enzyme, cyclic AMP (cAMP), which initates a protein that increases heart rate.s for heart rate, caffeine is a central nervous system stimulant. It is in a class with other psychoactive drugs like epinephrine, amphetamines, cocaine, Ecstacy, nicotine and other ADHD medications like Ritalin. It is one of the few psychoactives that is legal.
Answer   Caffeine is a stimulant which will cause an increase in heart rate. This increase should just be temporary, like the increase during exercise. Usually with an in â¦ crease in HR, there is an increase in BP.As for severely increase, it shouldn't but it will depend on how much caffeine your talking about.he caffeine that is located in coffee can affect or alterate the metabolism. First, the caffeine accelerates the pulse rate, then it accelerates the metabolism and finally th â¦ e digestive system (you burn calories faster and digest what you ate faster) A Perfect example of metabolism is a plant cell.