A cup of coffee is good for activating blood vessels.

The study was presented at the 2013 academic conference of the American Heart Association. The team at Ryukyu University in Okinawa, Japan, studied 27 healthy adults and found that drinking coffee helped improve blood circulation at the ends of their fingers. after drinking a cup of caffeinated coffee, blood flow increased by 30% in 75 minutes compared with decaffeinated coffee drinkers.

Lead author Masahiro Nakai, a professor in the Department of Pharmacology at Thiqiu University and a cardiovascular specialist, said the research evidence suggests that drinking coffee may improve cardiovascular health.

Many people have the habit of drinking coffee, and more and more people in the medical profession are doing research on coffee. Past studies have found that people with coffee drinking habits are less likely to die of heart attacks and strokes, and studies have suggested that high doses of caffeine can help improve the function of large arteries.

The participants in the study usually had no coffee drinking habits, ranging in age from 22 to 30. The researchers asked everyone to drink five ounces of coffee (about 142 grams) on the first day, but the experiment was divided into two groups, some drinking regular caffeinated coffee and others drinking decaffeinated coffee. None of them knew if their coffee was caffeinated.

Then, the researchers measured the blood circulation of their fingers, blood pressure, heart rate, vascular impedance and other information. the researchers also drew blood for them to analyze the concentration of caffeine in the blood and control the concentration of vascular hormones. To figure out whether it's caffeine or hormones. The experiment was done again two days later, and this time the two groups switched the types of coffee they drank.

The results showed that people who drank caffeinated coffee had a slight increase in blood pressure and improved vascular endothelial function, and there was no significant change in heart rate no matter which coffee they drank. Professor Masahito Nakai pointed out that it is not known how caffeine works to improve the function of small blood vessels, perhaps caffeine can help open blood vessels and reduce the body's inflammatory response. If the effect of coffee can be further confirmed, coffee may be used to treat cardiovascular disease in the future.