Coffee is good for activating blood vessels.

The study was presented at the American Heart Association's 2013 Symposium. A research team from the University of the Ryukyus in Okinawa, Japan, studied 27 healthy adults and found that drinking coffee improved blood circulation at the end of fingers. After drinking a cup of caffeinated coffee, blood flow increased by 30% within 75 minutes compared with those who drank decaffeinated coffee.

Lead author Masato Tsuoi, a cardiovascular specialist and professor in the Department of Pharmacology at Sulphur University, said evidence suggests coffee consumption may improve cardiovascular health.

Many people drink coffee, and more and more people in the medical community are doing research on coffee. Previous studies have found that coffee drinkers are less likely to die of heart disease and stroke, and studies have suggested that high doses of caffeine help improve arterial function.

The participants in the study were non-coffee drinkers and ranged in age from 22 to 30. On the first day, the researchers asked everyone to drink five ounces of coffee (about 142 grams), but the experiment was divided into two groups, some people drank regular caffeine coffee, others drank decaf coffee, all of whom did not know whether their coffee had caffeine or not.

Then, the researchers measured their finger blood circulation, blood pressure, heart rate, vascular impedance and other information, the researchers also took blood samples, analyzed the concentration of caffeine in the blood, control vascular function hormone concentration, to determine whether caffeine or hormone effect. Two days later, the experiment was repeated, this time with the two groups switching coffee types.

The results showed that caffeinated coffee drinkers had a slight increase in blood pressure and improved vascular endothelial function, and there was no significant change in heart rate regardless of the type of coffee consumed. Professor Tsutsui pointed out that it is not yet known how caffeine works to improve small blood vessel function. 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 diseases in the future.