Was it a HIIT? A process evaluation of a school-based high-intensity interval training intervention.

BACKGROUND: Despite a growing body of research investigating high-intensity interval training (HIIT) in schools, there are limited process evaluations investigating their implementation. This is concerning because process evaluations are important for appropriately interpreting outcome findings and augmenting intervention design. This manuscript presents a process evaluation of Making a HIIT, a school-based HIIT intervention. METHODS: The Making a HIIT intervention spanned 8 weeks and was completed at three schools in Greater Brisbane, Australia. Ten classes (intervention group) completed 10-min teacher-led HIIT workouts at the beginning of health and physical education (HPE) lessons, and five classes (control group) continued with regular HPE lessons. The mixed methods evaluation was guided by the Framework for Effective Implementation by Durlak and DuPre. RESULTS: Program reach: Ten schools were contacted to successfully recruit three schools, from which 79% of eligible students (n = 308, x ¯ age: 13.0 ± 0.6 years, 148 girls) provided consent. Dosage: The average number of HIIT workouts provided was 10 ± 3 and the average number attended by students was 6 ± 2. Fidelity: During HIIT workouts, the percentage of time students spent at ≥ 80% of maximum heart rate (HRmax) was 55% (interquartile range (IQR): 29%-76%). Monitoring of the control group: During lessons, the intervention and control groups spent 32% (IQR: 12%-54%) and 28% (IQR: 13%-46%) of their HPE lesson at ≥ 80% of HRmax, respectively. Responsiveness: On average, students rated their enjoyment of HIIT workouts as 3.3 ± 1.1 (neutral) on a 5-point scale. Quality: Teachers found the HIIT workouts simple to implement but provided insights into the time implications of integrating them into their lessons; elements that helped facilitate their implementation; and their use within the classroom. Differentiation: Making a HIIT involved students and teachers in the co-design of HIIT workouts. Adaption: Workouts were modified due to location and weather, the complexity of exercises, and time constraints. CONCLUSION: The comprehensive evaluation of Making a HIIT provides important insights into the implementation of school-based HIIT, including encouragings findings for student enjoyment and fidelity and recommendations for improving dosage that should be considered when developing future interventions. TRIAL REGISTRATION: ACTRN, ACTRN12622000534785 , Registered 5 April 2022 - Retrospectively registered.

An assessment of Australian school physical activity and nutrition policies.

OBJECTIVE: This study's objective was to identify and assess existing physical activity and nutrition policies for Australian schools. METHODS: Policies were identified through a search of the websites of national and state/territory education departments and school associations, and were subsequently assessed against specific criteria. RESULTS: Policies were identified for government schools, but only for one non-government school association. Physical activity policies were identified at the national level and for six of eight state/territories. The national policy was mandated, and most state/territory physical activity policies were mandated and consistent with the national policy. Several physical activity policies did not meet expert recommendations for time and instructor qualifications. Nutrition policies were identified at the national level and all eight states/territories. The national policy was not mandated, but all state/territory nutrition policies were mandated and consistent with the national policy and relevant guidelines. Most physical activity and nutrition policies lacked information about implementation monitoring. CONCLUSIONS: To improve school practices, policies are needed that are mandated and consistent with expert recommendations, use clear language, and specify monitoring and accountability mechanisms. Implications for public health: Improvements in school policies can promote physical activity and healthy eating behaviours to positively influence student outcomes across Australia.