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If you're like the average American, your day cannot start without sipping on a hot cup of coffee. The caffeine in coffee stimulates your brain and makes you feel awake, but it also is causing other affects in your body. Caffeine does not slow the heart rate; it actually increases it and can even cause stress to your cardiovascular system all day long.
Caffeine and Heart Rate
Caffeine is a stimulant derived from the leaves as well as the seeds of plants. It is most commonly found within coffee but also can be in tea, chocolate and some medications. The stimulant effects of caffeine help to increase your alertness, cardiovascular system and even your brain function. In the case of the cardiovascular system, caffeine increases your heart rate.
- Caffeine is a stimulant derived from the leaves as well as the seeds of plants.
- The stimulant effects of caffeine help to increase your alertness, cardiovascular system and even your brain function.
How Caffeine Affects Heart Rate
The caffeine molecule inside the brain appears to the brain much like a naturally made chemical transmitter known as adenosine. When caffeine binds to the adenosine receptors inside the brain, it stimulates the sympathetic nervous system and elicits a fight or flight response. Part of this response is an increase in heart rate. According to a study published by the Duke University Medical Center in 1999, caffeine has the ability to increase blood pressure and stress responses such as those listed above all day. This study monitored the body's response to caffeine in 72 coffee drinkers. Over two weeks, participants drank coffee some days and abstained from it other days. On both days, hormonal and cardiovascular responses were monitored. Researchers discovered that caffeine elicits stress responses all day, increasing blood pressure and stress hormones 3.
- The caffeine molecule inside the brain appears to the brain much like a naturally made chemical transmitter known as adenosine.
- According to a study published by the Duke University Medical Center in 1999, caffeine has the ability to increase blood pressure and stress responses such as those listed above all day.
Caffeine has a diuretic-like effect on your body when you consume large amounts. This means that it increases the amount of urine your body is producing. Unless you counteract this by increasing your fluid intake, you risk suffering from dehydration. Dehydration can affect your heart. A symptom of dehydration is an increased heart rate.
- Caffeine has a diuretic-like effect on your body when you consume large amounts.
- Unless you counteract this by increasing your fluid intake, you risk suffering from dehydration.
Other Negative Effects
How Caffeine Affects the Nervous System
Not only does caffeine increase heart rate, but overuse or consumption by those particularly sensitive to caffeine might cause certain heart arrhythmias. Furthermore, caffeine can increase blood pressure by three to 14 points for systolic pressure and four to 13 points for diastolic pressure, states Sheldon G. Sheps, M.D., on MayoClinic.com. Either of these conditions might be hard on the heart, particularly for a person with known cardiovascular problems.
According to Sheps, most people can take in about 200 mg of caffeine per day without any negative side effects. This amount is equal to the caffeine inside of two 12 oz. cups of coffee, but you might want to check with your doctor regarding the appropriate amount of caffeine for your condition.
- According to Sheps, most people can take in about 200 mg of caffeine per day without any negative side effects.
How Caffeine Affects Heart Rate
How Caffeine Affects the Nervous System
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- Kids Health.org: Caffeine; Mary L. Gavin, MD; January 2008
- Science Daily.com: Morning Coffee Boosts Blood Pressure, Stress Hormones All Day; March 1999
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- Abdel-Hady H, Nasef N, Shabaan AE, Nour I. Caffeine therapy in preterm infants. World J Clin Pediatr. 2015;4(4):81-93. doi:10.5409/wjcp.v4.i4.81
- American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders. 5th edition. Washington DC; 2013.
- Turnbull D, Rodricks JV, Mariano GF, Chowdhury F. Caffeine and cardiovascular health. Regul Toxicol Pharmacol. 2017;89:165-185. doi:10.1016/j.yrtph.2017.07.025
- Centers for Disease Control and Prevention. Alcohol and Caffeine. Updated October 23, 2018.
- Alsunni AA. Energy Drink Consumption: Beneficial and Adverse Health Effects. Int J Health Sci (Qassim). 2015;9(4):468-474.
- Lyngsø J, Ramlau-Hansen CH, Bay B, Ingerslev HJ, Hulman A, Kesmodel US. Association between coffee or caffeine consumption and fecundity and fertility: a systematic review and dose-response meta-analysis. Clin Epidemiol. 2017;9:699-719. doi:10.2147/CLEP.S146496
- U.S. Food and Drug Administration. Pure and Highly Concentrated Caffeine. Updated September 21, 2018.
- National Institute on Drug Abuse. Drugs, Brains, and Behavior: The Science of Addiction. Updated July 2018.
Laura Niedziocha began her writing career in 2007. She has contributed material to the Stoneking Physical Therapy and Wellness Center in Lambertville, N.J., and her work has appeared in various online publications. Niedziocha graduated from Temple University with a Bachelor of Science in exercise science. She also has her Associate of Arts in communications from the Community College of Philadelphia.