Describes benefits of laughter (e.g., relaxes muscles, stimulates production of “feel-good” brain chemicals, increases blood flow to the peripheries). Anger and hostility can reverse these positive changes. (Carter, Rita, Ed. Exploring Consciousness. p 199. CA: University of California Press, 1998.)

Humor/laughter can stabilize blood pressure, massage inner organs, strengthen immune system function, improve digestion, and may help you live longer. (Greenwood-Robinson, Maggie, PhD. 20/20 Thinking. p 104-105. NY: Avery, Putnam Special Markets, 2003.)

Laughter lowers the blood pressure temporarily. It causes an increase in vascular blood flow and an increase in oxygenation of the blood, which can promote healing. (Bartekian, Vatche. Laughter Can Cure What Ails You. Ask Men website. http://www.askmen.com/fashion/body_and_mind/19_better_living.html)

Study 2003, Reiss and colleagues: the brain's mesolimbic reward center, which is responsible for the rewarding feelings that follow such events as monetary gain or cocaine use, is also activated by humor. (http://www.news-medical.net/?id=14460)

Humor and Laughter: increase level and activity of natural killer cells, reduce pain, lower levels of stress hormones (epinephrine, cortisol, dopac, and growth hormone) in the blood, and temporarily lower blood pressure. (McGhee, Paul E., Ph.D. The Physical Health Benefits. http://laughterremedy.com/articles.dir/humor.html)

Studies by Michael Miller, M.D., director of preventive cardiology at the University of Maryland Medical Center: In 2006, 20 healthy volunteers, none suffering from heart disease or high blood pressure, were randomly assigned to watch a 15- to 30-minute segment of either a comedy film to induce laughter, or an action-packed drama to cause mental stress. Nineteen of the 20 people who watched the comedy experienced increased blood flow by a mean of 15 percent, suggesting that laughter relaxes the arteries and may ease strain on the heart. Fourteen of the 20 volunteers who watched the drama found that blood flow in their arteries was reduced by a mean of 47 percent—an amount Miller compared to a fit of anger, which may raise blood pressure, constrict arteries and stress the heart. (Abrahms, Sally. Laughter Yoga to Improve Health? It’s No Joke. http://bulletin.aarp.org/yourhealth/healthyliving/articles/laughter_yoga_to_improve.html)

Humor and Laughter increase level and activity of natural killer cells, reduce pain, lower levels of stress hormones (epinephrine, cortisol, dopac) in the blood, and temporarily lower blood pressure. (McGhee, Paul E., Ph.D. The Physical Health Benefits. brain-laughter/brain-laughter/%20http://laughterremedy.com/articles.dir/humor.html)

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