Kuttner L, Chambers CT , Hardial J, et al. "A randomized trial of yoga for adolescents with irritable bowel syndrome." Pain Research & Management. 11(4):217-23, 2006.
In this randomized controlled study of 25 adolescents with IBS, one group received a one hour instructional yoga session followed by four weeks of daily home practice guided by a video and one group was put on a wait list. Adolescents in the yoga group reported lower levels of functional disability, less use of avoidance, lower anxiety and significantly lower scores for gastrointestinal symptoms than the wait list control goup.
Taneja I, Deepak KK, Poojary G, et al. "Yogic versus conventional treatment in diarrhea-predominant irritable bowel syndrome: a randomized control study." Applied Psychophysiology and Biofeedback. 29:19-33, 2004.
This randomized controlled study was conducted to compare and evaluate the effect of yogic and conventional treatment in diarrhea-predominant irritable bowel syndrome (IBS). The patients were 22 males with confirmed diagnosis of diarrhea-predominant IBS. The conventional group was given symptomatic treatment with the medication loperamide 2-6 mg/day for 2 months. The yogic intervention group performed a set of 12 asanas (yogic poses) along with Surya Nadi pranayama (right-nostril breathing) two times a day for 2 months. All participants were tested at the start of the study and 1 month and 2 months after receiving the intervention. Two months of both conventional and yogic intervention showed a significant decrease of bowel symptoms and state anxiety. This was accompanied by an increase in gastric activity in the conventional intervention group and enhanced parasympathetic reactivity, as measured by heart rate parameters, in the yogic intervention group. The study indicates a beneficial effect of yogic intervention over conventional treatment in diarrhea-predominant IBS.