An alternative approach to blood pressure monitoring would be to ask the patient about recent caffeine consumption and interpret the blood pressure reading based on this information. Having a patient abstain from caffeine for 30 minutes prior to blood pressure monitoring is not adequate to avoid caffeine's potential effects. Typically, blood pressure changes occur within 30 minutes, peak in 1-2 hours, and may persist for more than 4 hours. Reviews of caffeine's acute effect on blood pressure indicate changes of 3-15 mm Hg systolic and 4-13 mm Hg diastolic.

Caffeine tolerance diminishes the acute effect of caffeine on blood pressure, and hypertensive individuals are more susceptible to blood pressure changes. The effect of caffeine on blood pressure has been examined for decades, with variable results depending on factors such as population examined (eg, hypertensive status, physical stressors, age) and study design (eg, acute effects, chronic ingestion, retrospective epidemiologic review). Caffeine levels peak 30-120 minutes after oral intake and caffeine's half-life is 3-6 hours. Literature was also obtained from citations in relevant articles.Īrticles that examined caffeine's acute effect on blood pressure were reviewed, with additional focus on caffeine tolerance and hypertensive status.Ĭaffeine appears to affect blood pressure through adenosine receptor inhibition and an increased release of select neurotransmitters. Search terms included caffeine and blood pressure. Literature was obtained by searching MEDLINE (1980-September 2007), International Pharmaceutical Abstracts (1980-September 2007), and the Cochrane Database of Systematic Reviews (1994-September 2007). “In order to maintain a healthy heart and a healthy blood pressure, people must limit their coffees to fewer than six cups a day-based on our data six was the tipping point where caffeine started to negatively affect cardiovascular risk,” Hyppönen said.To determine whether patients should wait 30 minutes after caffeine consumption to have their blood pressure measured. Interestingly, the amount for safe consumption did not seem to have anything to do with whether you had the genes to metabolize coffee faster.ĭespite carriers of the fast-processing gene variation being four times quicker at metabolizing caffeine, the research does not support the belief that these people could safely consume more caffeine, more frequently, without detrimental health effects, study author Elina Hyppönen, Ph.D., M.P.H., of the Australian Centre for Precision Health said in a press release. ( Researchers considered one cup of coffee to contain approximately 75mg of caffeine.) They discovered that those drinking more than six cups of coffee a day had a 22 percent higher risk of cardiovascular disease than those who drank one to two cups a day, putting that ceiling for safe coffee consumption at six cups per day. Biobank data of more than 347,000 people ages 37 to 73 years to explore how the caffeine-metabolizing gene (CYP1A2) helps carriers process caffeine, as well as identify the risks of cardiovascular disease as it relates to coffee consumption and genetic variations.

In the study, researchers delved into U.K. → Get Bicycling All Access for the latest cycling and health news! Thanks to research from the University of South Australia conducted in 2019, we now have an upper limit for how much coffee is safe when talking about your heart disease risk. Too much caffeine can cause high blood pressure, a precursor to heart disease, and can cause side effects like dizziness, shakiness, headache, or abnormal heartbeat.

But as with any good thing, too much coffee-too much caffeine specifically-is a bad thing. For many, life without at least one daily cup is simply a no-go. Endurance athletes swear by java to get them going (in more ways than one).

But drinking some coffee is also better than not the same study found that nondrinkers had an 11 percent higher risk of cardiovascular disease.įor billions of people around the planet, coffee is fuel for the daily grind.

Research published in the American Journal of Clinical Nutrition in 2019 has found that the upper limit for coffee consumption is six cups a day.

However, for every 1 mm Hg increase in eye pressure that caffeine produces, there is an equal 1mm Hg increase in ocular perfusion pressure, or the rate at which aqueous is released from the eye.

Coffee is a must-have to start the day for many cyclists, but too much caffeine has been shown to raise blood pressure, and may also lead to things like headache, shakiness, or abnormal heartbeat. Further, aqueous fluid formation is also stimulated through caffeine’s blood pressure- elevating effects.

Does caffeine raise blood pressure