Table 3.

Summary of Study Measures

Study Measure	Timepoints	Explanation	Related intervention component/s
Attendance	All sessions from baseline to 12 weeks	Measure of feasibility	All
Retention	1st exercise session to last attended study session	Measure of feasibility Total days involved and number of participants completing the study versus withdrawal	Program involvement
Adverse events	Reported at any exercise, dietary or psychology session	Measure of feasibility Minor or major Assessed whether unrelated, potentially related or related to the study	All
Satisfaction	12 weeks or at withdrawal	Measure of feasibility Collected via written surveys with Likert scaled questions	All
Heart rate during exercise sessions	Continuously during HIIT group exercise sessions and individual make-up sessions	Guide for participants during exercise sessions to achieve high intensity and recovery heart rate targets Changes in HR across the intervention are a fitness indicator	Exercise sessions
Anthropometry	Baseline	Participant characteristics for weight, height and waist circumference, with calculation of BMI, BMI-for-age percentiles and Z-score	Not a target of any interventions
Maximal graded cardiorespiratory testing	Baseline and 12 weeks	VO2peak: Peak oxygen consumption during testing as a measure of maximal exercise capacity. Testing time to reach VO2peak measures time to exertion. HRmax: Maximum heart rate measured during exercise testing. A reduction in HRmax over time can indicate improvements in cardiac output. MFO: maximum fat oxidation measure during testing, positively associated with respiratory capacity and training status [36].	Exercise sessions
Australian Child and Adolescent Eating Survey FFQ (Nutrient intake and diet quality)	Baseline and 12 weeks	Total and food-group based Australian Child and Adolescent Recommended Food Scores, measures of diet quality reflecting adherence to the Australian Dietary Guidelines. Estimated daily intake of food groups as a percentage contribution to total energy intake. Estimated macro- and micronutrient intake	Dietary education sessions and cooking demonstrations
Piers Harris-2 Self-concept scale	Baseline and 12 weeks	Global measure of self-esteem. Measures total and domains of behavioural adjustment, intellectual and school status, physical appearance and attributes, popularity, happiness and satisfaction, and freedom from anxiety	All

HIIT High Intensity Interval Training, FFQ food frequency questionnaire