Caffeine is a stimulant. People drink it in coffee and teas, especially black teas. They also take weight loss pills that contain caffeine in it. This is because caffeine has an effect on the heart. It increases heart rate and increases blood pressure. Although the effect is short, it does affect the way the heart pumps blood throughout the body.
In recent studies, researchers noted caffeine increased BPM but only a toxic level. When coupled with other stimulants like ephedrine, it added to the overall effect of increased BPM. "Caffeine increased BPM only at a toxic level of 250?µM. Adding caffeine to PEA or higenamine but not ephedrine further increased BPM" (Calvert, Vohra, Ferguson & Wiesenfeld, 2015, p. 1). How does caffeine affect blood pressure? Some researchers suggest caffeine has the capacity to block a hormone that enables a person's arteries to remain wide. Still, others believe caffeine causes a person's adrenal glands to create and release additional adrenaline. Adrenlaine causes an increase in blood pressure.
In fact, research suggests, regular coffee drinkers have a higher average blood pressure vs. those who do not drink. Additionally, the effects of caffeine increase in older or overweight men. High blood pressure has an effect on how hard the heart has to work to pump blood. This is perhaps the reason why BPM increases when consuming caffeine, especially high doses of caffeine. Another study explains caffeine increases other things that could lead to increased heart activity. "At rest, caffeine (p
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