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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.
It can cause anxiety due to increase in heart rate. Additionally, caffeine can produce heada â¦ ches, caused by the restriction of the blood vessels and can increase the risk of stroke. Caffeine is a stimulant and can cause an increase in heart rate.Furthermore, it increases risk of irregular heart rhythm.nti-Diuretic Hormone is released when the body wishes to conserve water. The hormone tells the kidneys to reab â¦ sorb more water which results in urine becoming concentrated. Alcohol has a similar effect which is why, when it inhibits ADH, the body no longer attempts to conserve water.