Tests were carried out to study the effects of laughter on the body. People watched funny films, while doctors checked their heart rate, blood pressure, breathing and muscle. It was found that laughter has similar effects to physical exercise. It increases blood pressure, the heart rate and the rate of breathing, it also works several groups of muscles in the face, the stomach, and even feet. If laughter exercises the body, it must be beneficial.

　　Other tests have shown that laughter appears to be capable of reducing the effects of a pain on the body. In one experiment doctors produced pain in groups of students who listened to different radio programs. The group which tolerate the pain for the longest time was the group which listened to a funny program. The reason why laughter can reduce pain seems to be that it helps to produce endorphins (内啡肽) in the brain. These are natural chemicals which decrease both stress and pain.

　　There is also some evidence to suggest that laughter helps the body's immune (免疫)system , that is, the system which fights infection. In an experiment, one group of students watched a funny video while another group served as the control group-in other words, a group with which to compare the first group. Doctors checked the blood of the student in both groups and found that the people in the group that watched the video had an increase in the activity of their white blood cells, that is, the cell which fight infection.

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