Laughter is good for the heart

中国有句俗语：“笑一笑，十年少。”而外国科学家也经研究证实，每天笑15分钟可以达到有氧运动的功效，虽说如此，该做的运动还是偷不得懒的。

Laughter is good for the heart because it prolongs life while depression increases the risk of an early death， according to two new studies. "A good bout of laughter every day provides similar cardiovascular benefits as exercise because it stimulates the blood flow， " said Michael Miller， who headed one research team at the University of Maryland.

On the other hand，" depression—or the lack of laughter—is often linked to unhealthy habits such as smoking and drug addiction and increases the risk of death by 44 percent， " said Wein Jiang， who led a study of 1，000 heart patients for the University of North Carolina.

Miller said laughter produced a magnitude of change in the endothelium similar to the benefit we might see with aerobic activity， but without the aches， pains and muscle tension associated with exercise.

While laughter should not replace exercise， he said， "We do recommend that you try to laugh on a regular basis. 30 minutes of exercise 3 times a week and 15 minutes of laughter on a daily basis are probably good for the vascular system."