Tailored Yoga Therapy for Attention-deficit Hyperactivity Disorder in Adults: A Feasibility Randomised Controlled Trial

The primary aim of the study is to test the feasibility and acceptability of a tailored, group-based yoga intervention for adults with attention-deficit hyperactivity disorder, by monitoring recruitment, engagement, and completion rates, and through obtaining qualitative feedback from participants at the end of the intervention.

A secondary aim is to explore whether the yoga intervention is associated with improvements in attention-deficit hyperactivity disorder and related symptoms (i.e., anxiety, depression), quality of life, and general functioning, compared to a control intervention (group-based functional movement sessions). The secondary outcomes will be assessed with self-report questionnaires at the start, middle and end of the yoga and control interventions, and three months after completion of the interventions.

The investigators will also examine aspects of cognitive and physiological functioning through laboratory testing at the start and end of the intervention, focusing on measures of autonomic activation (e.g., the 'fight or flight response), bodily awareness, attention, and response inhibition. Physiological functioning, such as sleep quality, activity levels, and heart rate, will be monitored throughout the six-week study with wearable devices (e.g., Fitbit activity trackers), to provide longer-term, real-world insights into the possible benefits of the intervention.

The investigators will explore whether the yoga intervention is associated with improvements in attention-deficit hyperactivity disorder and related symptoms/abilities, including emotional regulation, social behaviour, attention, focus, interoception and stress reactivity. The investigators will also explore whether the yoga intervention is linked with improved bodily stress markers (heart rate variability), sleep, and physical activity.

This feasibility randomised controlled trial will include 20 participants who will be randomly allocated (1:1) to either the group-based tailored yoga therapy intervention (n=10), or a group-based functional movement class (n=10). The latter will be a structured class focusing on light strength, mobility and flexibility.

All participants will attend an initial in-person laboratory testing session at the start and end of the 6-week intervention. Each week, both intervention group and control group will attend an in-person one-hour group session. Each week, participants will be asked to practice at least twice, using a 20-minute video recording on demand from home. Outcomes will be measured using self-report, lab-based, and digital wearable measures.