Factors Affecting Heart Rate while Performing Physical Activities

Topics: Adenosine triphosphate, Caffeine, Red Bull Pages: 4 (700 words) Published: June 30, 2014
Factors affecting heart rate while performing physical activities


Would consumption of a particular energy drink- Red Bull affect one’s heart rate?


Hormones change a cell’s activity by binding to specific hormone receptors which activate proteins within the cell - which then go on to activate other enzymes that direct the cell’s function.  
Caffeine is a methyl xanthine, which acts as an anti catalyst to an enzyme called cyclic phosphodiesterase (cAMP- PDE); whose job is to block the production of cAMP (cyclic adenosine monophosphate). cAMP is produced by the binding of a hormone called epinephrine. As caffeine inhibits cAMP- PDE from doing its job, cAMP generated by epinephrine is increased and stays active in the cell for a longer period. This cAMP produced then diffuses through the cell and activates an enzyme called kinase, which in turn produces adenosine triphosphate (ATP). ATP is an enzyme essential for the contraction and relaxation of heart muscles. The result of increased cAMP levels (due to caffeine) is increased levels of ATP ultimately leading to an increase in the responsiveness of heart muscles causing an increase in heart rate.

 The energy drink Red Bull contains 80 mg of caffeine.

The consumption of energy drink will result in an increase in heart rate during, at rest as well as after physical activity.

“ If subject consumes an energy drink, then subject’s heart rate will increase at rest and after physical activity”

This is because the energy drink (Red Bull) contains caffeine, which is a central nervous system and metabolic stimulant. Upon consumption, caffeine increases ATP levels in the body, which causes heart rate to elevate.


Independent Variable:
Presence or absences of energy drink red bull on body of the subject evaluated.

Dependent Variable:
Heart Rate
Time taken by heart rate to return to normal rate after its peak...
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