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Laughter yoga was found to improve mood and heart rate variability in this group of 6 patients awaiting organ transplantation. COMMENT: this is a very small study and did not have a control group. Thus, the conclusions are interesting but not supported scientifically. Their conclusion may be true, but their research does not support or refute this conclusion. Altern Ther Health Med. 2012 Sep-Oct;18(5):61-6    (retrieved Oct, 2012). There are currently 1090 pearls in the database. While every attempt has been made to ensure accuracy, mistakes can and do occur. Use databank at your own risk. All pearls © 2024 by the Internet Medical Association. Click Here to view more medical pearls.