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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.
A small amount of caffeine intake by a completely healthy person may have minimal effect. Caffeine is a stimulant and it will elevate heart rate, increase blood flow, and raise body temperature. It increases blood sugar levels and act as a diuretic, meaning you urinate more frequently and reduce water intake. small amount of caffeine intake by a completely healthy person may have minimal effect. Caffeine is a stimulant and it will elevate heart rate, increase blood flow, and raise body temperature. It increases blood sugar levels and act as a diuretic, meaning you urinate more frequently and reduce water intake.