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Effect of HIIT versus MICT on body composition and energy intake in dietary restrained and unrestrained adolescents with obesity.

High Intensity Interval Training (HIIT) has been suggested as an effective alternative to traditional Moderate Intensity Continuous Training (MICT) that can yield improvements in a variety of health outcomes. Yet, despite the urgent need to find effective strategies for the treatment of pediatric obesity, only a few studies have addressed the impact of HIIT on eating behaviors and body composition. This study aimed to compare the effect of HIIT versus MICT on eating behaviors in adolescents with obesity, and assess whether the participants' baseline dietary status is associated with the success of the intervention. Forty-three adolescents with obesity were randomly assigned to a 16-week MICT or HIIT intervention. Body composition and 24-hour ad libitum energy intake were assessed at baseline (T0) and at the end of the program (T1). Restrained eating, emotional eating and external eating were assessed using DEBQ at baseline. Both interventions led to significant weight, BMI, and FM% reductions, with better improvements in FM% in the HIIT group; whereas 24-hour ad libitum energy intake increased to a similar extent in both groups. HIIT provides better body composition improvements over MICT, despite a similar increase in energy intake. Restrained eaters experienced less weight loss and smaller BMI reductions compared to unrestrained eaters adolescents, with higher baseline cognitively restrained adolescents showed greater increased of their ad libitum energy intake. •HIIT favors better body composition improvements compared with MICT •Both MICT and HIIT increased ad libitum energy intake in adolescents with obesity •Weight loss achievement is better among unrestrained eaters.