More Reasons to Laugh
New research suggests repetitive laughter can affect hormones in the same way that exercise does. A preventive care specialist and researcher at Loma Linda University, Dr. Berk presented his findings this week at the 2010 Experimental Biology conference in Anaheim, California.
"It's not rocket science that exercise is good for you," Berk said. "It adds years to your life."
Berk acknowledged the sample size of 14 is small. Major sources of research dollars such as the National Institutes of Health do not fund projects that examine issues such as laughter, so these studies tend to be smaller, he said.The topic needs further research, he said.
"The reality is laughter is good for you," Berk said. "It makes us feel good. The dopamine is there. A merry heart is good medicine. There is plenty of other data to support that."
Dr. Michael Miller, director of the Center of Preventive Cardiology at the University of Maryland Medical Center, recommends laughter as part of a heart healthy program for patients.
"When you laugh for 15 minutes, the increase in the diameter of the blood vessel is similar to what you get when you run, jog or do aerobic-like activity," he said.
A 2005 study by Miller found that laughter caused the tissue in the inner lining of blood vessels, known as endothelium, to expand allowing more blood flow."It opens the blood vessel up and prevents platelets from clumping. It has a lot of heart-protective characteristics," he said.
Another study conducted by Miller in 2009 compared responses from 150 people who had suffered heart problems and another 150 who didn't. The results showed that those who had suffered heart attacks or bypass surgery were less likely to find humor in everyday life and felt more hostility.
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