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Indian researchers: Coffee won’t give extra heart beats


New York: Indian-origin researchers reported that regular consumption of caffeine does not lead to extra heartbeats. Extra heartbeats can cause to the rare cases of stroke-related morbidity and mortality.

The study, led by researchers at the University of California San Francisco (UCSF), measured the chronic consumption of caffeinated products over a 12-month period.

“Clinical recommendations advising against the regular consumption of caffeinated products should be reconsidered as we may unnecessarily be discouraging consumption of items like chocolate, coffee and tea that might actually have cardiovascular benefits,” said senior author Gregory Marcus, health cardiologist and director of clinical research.

“Given our recent work demonstrating that extra heartbeats can be dangerous, this finding is especially relevant,” he noted in a paper published in the Journal of the American Heart Association.

Excessive premature atrial contractions (PACs) have been shown to result in atrial fibrillation, stroke and death while excessive premature ventricular contractions (PVCs) have been shown to result in increased heart failure, coronary artery disease and death.

Both abnormalities have been tied to caffeine consumption through studies and trials but these studies were performed several decades ago and did not use PACs and PVCs as a primary outcome.

In their study, Marcus and his colleagues analysed 1,388 randomly selected participants.

Of the total participants, 840 (61 percent) consumed more than one caffeinated product daily.

The researchers found no differences in the number of PACs or PVCs per hour across levels of coffee, tea and chocolate consumption. More frequent consumption of these products was not associated with extra heartbeats.

“This was the first community-based sample to look at the impact of caffeine on extra heartbeats, as previous studies looked at people with known arrhythmias,” said lead author Shalini Dixit, a medical student at UCSF.

“Whether acute consumption of these caffeinated products affects extra heartbeats requires further study,” she said.

Recent growing evidence indicates the potential cardiovascular benefits of several common caffeinated products such as coffee, chocolate and tea.

The result is uncertainty in counselling patients on consumption of these products, with patients possibly reducing their intake to avoid presumed cardiac issues.(IANS)

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Researchers Design Tool that Customises Caffeine Intake for Alertness

It also enables users to automatically obtain optimal caffeine timing and doses to achieve peak alertness at the desired times, said the study


Researchers have designed a web-based caffeine optimisation tool with effective strategies to maximize alertness while avoiding excessive caffeine consumption.

Using multiple sleep-deprivation and shift-work scenarios, the researchers have generated a caffeine-consumption guidance, according to findings published in the journal Sleep.

Their analysis found that the solutions suggested by the quantitative caffeine optimisation tool either required on average 40 per cent less caffeine or enhanced alertness by an additional 40 per cent.

“The tool allows an individual to optimize the beneficial effects of caffeine while minimizing its consumption,” said study lead author Jaques Reifman from the US Army Medical Research.

The findings showed that people who were more sensitive to caffeine and were drinking a lot of coffee consumed low amounts of tea. Pixabay

In the tool, the users can input several factors – the desirable peak-alertness periods within a sleep/wake schedule, the minimum desirable level of alertness and the maximum tolerable daily caffeine intake.

The tool allows users to predict the alertness of an “average” individual as a function of sleep/wake schedule and caffeine schedule.

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It also enables users to automatically obtain optimal caffeine timing and doses to achieve peak alertness at the desired times, said the study.

“For example, if you pull an all-nighter, need to be at peak alertness between, say, 9 a.m. and 5 p.m., and desire to consume as little caffeine as possible, when and how much caffeine should you consume?, This is the type of question the tool was designed to answer,” Reifman said. (IANS)