Impact of high-intensity interval training including Indigenous narratives on adolescents' mental health: a...

We investigated the efficacy of teacher-delivered high-intensity interval training (HIIT) with Indigenous narrative options on the mental health of school students in low-mid socioeconomic areas, compared to standard curriculum physical education practice.

A cluster-randomised controlled trial was conducted in eight schools (N=368, age range 11-13 years) over 16 weeks. The primary outcome was the Strengths and Difficulties Questionnaire (SDQ) score. Generalised linear mixed models, controlling for the SDQ at baseline were applied, expressed as β, 95% confidence intervals, standardised effect, and p-value. Focus groups elicited experiences with participating in and delivering the intervention.

There were no clear effects for SDQ total score (β -0.15, CI -0.98 - 0.67, SE 0.42, p=0.714). Teachers did not deliver the Indigenous narrative options consistently owing to the perceived preparation needed and lack of confidence.

HIIT delivered in this manner had no effect on self-perceived psychological difficulty or mental wellbeing in a cohort of young adolescents.

Future research should continue to explore opportunities to improve mental wellbeing via physical activity, but HIIT should not be implemented as a universal intervention for mental health gains alone. Teachers need more support to utilise Indigenous narratives as part of HIIT delivery.