Abstract
Laughter Yoga is an operative action not using humor, jokes, etc.; it is laughing from the bottom of the belly (Hearty Laughter, Belly Laughter), sustained for a long-lasting period (Extended Laughter) of 15 to 20 minutes. It is expected that Laughter Yoga has a preventive effect against dementia through increase of oxygen supplied to the body's cells. The author tested 15 persons (3 males, 12 females) and measured their physiological (blood pressure, muscle hardness, stress level) and psychological (TDMS-ST, POMS) indices before and after exercise of Laughter Yoga. A result promising for prevention of dementia, such as a fall of blood pressure, was detected.
