Sams DP, Handley ED, Alpert-Gillis LJ.  Clinical Child Psychology and Psychiatry.  Published online May 20, 2018. https://doi.org/10.1177/1359104518775144

This uncontrolled study of iMatter (Improve Mindful ATTention, Enhance Relaxation) group therapy in an adolescent inpatient settting included relaxation strategies, mindfulness exercises and yoga.  The study demonstrated an improvement in self-reported mood and objectively recorded physiological parameters (heart rate) immediately following the intervention.  Further studies are needed comparing iMatter with other types of therapy and also measuring longer-term outcomes.

http://journals.sagepub.com/doi/abs/10.1177/1359104518775144