Click name to view affiliation
This study involved the design and evaluation of the High-Intensity Interval Training Self-Efficacy Questionnaire (HIIT-SQ). Phase 1: Questionnaire items were developed. Phase 2: Australian adolescents (N = 389, 16.0 ± 0.4 years, 41.10% female) completed the HIIT-SQ, and factorial validity of the measurement model was explored. Phase 3: Adolescents (N = 100, age 12–14 years, 44% female) completed the HIIT-SQ twice (1 week apart) to evaluate test–retest reliability. Confirmatory factor analysis of the final six items (mean = 3.43–6.73, SD = 0.99–25.30) revealed adequate fit, χ2(21) = 21, p = .01, comparative fit index = .99, Tucker–Lewis index = .99, root mean square of approximation = .07, 90% confidence interval [.04, .11]. Factor loading estimates showed that all items were highly related to the factor (estimates range: 0.81–0.90). Intraclass coefficients and typical error values were .99 (95% confidence interval [.99, 1.00]) and .22, respectively. This study provides preliminary evidence for the validity and reliability of scores derived from the HIIT-SQ in adolescents.
Eather, Smith, Plotnikoff, Graham, and Lubans are with the Priority Research Centre in Physical Activity and Nutrition, School of Education, University of Newcastle, Newcastle, NSW, Australia. Beauchamp is with the School of Kinesiology, University of British Columbia, Vancouver, BC, Canada. Rhodes is with the Behavioural Medicine Laboratory, School of Exercise Science, University of Victoria, Victoria, BC, Canada. Diallo is with the School of Social Sciences and Psychology, Western Sydney University, Penrith, NSW, Australia. Jung is with the School of Health and Exercise Sciences, University of British Columbia, Kelowna, BC, Canada. Noetel is with the Inst. for Positive Psychology and Education, Australian Catholic University, North Sydney, NSW, Australia. Harris is with Auckland University of Technology, Auckland, New Zealand.