Effects of High-Intensity Interval Training Intervention on Physical Fitness and Body Mass Index of Overweight Primary Schoolchildren

Being overweight has serious health consequences for schoolchildren. Schools use different physical education (PE) programs for obesity prevention in children, but the overall positive impact of school-based interventions is questionable. This scientific work investigated the effects of high-intensity interval training (HIIT) intervention on physical fitness performance and body mass index (BMI) of overweight primary schoolchildren (seven years old males). Sixty-four boys, who had overweight, participated in this study. All participants practiced 44 PE classes. Control group (G1; n=32; mean age: 7.46±0.32 years; mean height: 123.35±3.28 cm; mean body mass: 27.81±2.32 kg; mean BMI: 17.82±0.11) performed curriculum PE during the investigation. The experimental group (G2; n=32; mean age: 7.54±0.27 years; mean height: 123.26±3.41 cm; mean body mass: 27.84±2.07 kg; mean BMI: 17.78±0.14) performed sixteen-week HIIT intervention in PE classes. Participants' height, weight, BMI, and physical fitness: push-up test, running sprint test, standing long jump test (SLJ), seat-and-reach test (SRT), and six-minute walk test (6MWT) were assessed in pre- and post-PE intervention. There were significant (