Twenty seconds of laughter can double heart rates for 3-5 minutes. This provides an inner workout for body organs. (Hafen, Brent Q., et al. Mind/Body Health. p 541-560. MA: Simon & Schuster, 1996.)

Research William Fry Jr., PhD: 20 seconds of hard laughter gives the heart the same beneficial workout as three minutes of hard rowing. (Lipton, Bruce, PhD. The Biology of Belief. p 197. CA: Mountain of Love / Elite Books, 2005.)

Laughter has been shown to increase endorphin levels, stimulate immune function, reduce cortisol, stimulate circulation, massage internal organs, and have positive effects on the cardiovascular and respiratory systems. (Lubbe, Francois. UK Editor for The Healthier Life. Laughter has Potential Medical Benefits.)

Studies by Michael Miller, MD, director of preventive cardiology at the University of Maryland Medical Center: 19 out of 20 Volunteers who watched the jolly film King Pin had an average increase in blood flow of 22%. 14 of 20 volunteers who watched the dramatic Saving Private Ryan showed an astonishing 35% decrease in blood flow. (Fawcett, Carole. Stress Management Consultant/Laughter Coach. Laughter Facts. )

Laughter: reduces serum cortical (a hormone released during the stress response), increases immunoglobulin A (antibody that helps fight upper respiratory disease), increases tolerance to pain, and increases heart rate, pulse rate, and juggles the internal organs. (Sultanoff, Steven, M., PhD. What is Humor?)

Research by Barb Fisher, University of Minnesota: 20 seconds of a good, hard belly laugh is worth three minutes on the rowing machine. Other benefits include: stress reduction, enhanced immune system, strengthened cardiovascular functions, increased oxygenation, improved muscle tone, and helps with digestion and constipation. (Brown, Tata Nicole, managing editor. Holistic Times, Vol 15, No 4, p 27. (Clayton College of Natural Health).

Studies by Dr. William Fry, Jr., Dr. Lee S. Berk, Dr. David C. McClelland, Dr. Kathleen M. Dillon, etc.: 20 seconds of laughter can double the heart rate for 3-5 minutes (equal to 3 minutes of strenuous rowing); enhances immune system function; increases levels of salivary IgA. (Cousins, Norman, MD (honorary). Head First. 130-140.NY: Penguin Books, 1989.)

Studies: distressing emotions (e.g., depression, anger, anxiety, and stress) are all related to heart disease. Humor directly changes distressing emotions so it may reduce the risk of heart disease. (Sultanoff, Steven, M., PhD. What is Humor? American Association for Therapeutic Humor Newsletter, November, 1998)

Study at the University of Maryland Medical Center: people with heart disease were 40 percent less likely to laugh in a variety of situations compared to people of the same age without heart disease. (Science of Laughter. Discovery Health.)

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