Little is known about how the intensity of aerobic training influences appetite-regulating hormones in obese adolescents. Our goal was to assess the effect of low and high intensity aerobic trainings on food intake and appetite-regulating hormones in obese adolescents. Forty three obese adolescents (age: 13–18y, BMI: 34.48 ± 3.94 kg/m2) were randomized into high intensity training (HIT; n = 20) or low intensity training (LIT; n = 23) groups for 12 weeks. All participants also received the same nutritional, psychological and clinical counseling. Pre- and postintervention energy intake (EI) and circulating levels of insulin, leptin, peptide YY3–36 (PYY3–36) and ghrelin were measured. Adolescents in the HIT showed a reduction in total EI and an increase in PYY3–36 (p < .05). Aerobic exercise training performed at ventilatory threshold 1 intensity, reduced EI and augmented PYY3–36 in obese adolescents, compared with LIT. The data suggest that HIT and LIT have differential effects in the regulation of appetite signals and subsequent EI in obese adolescents.
Prado is with the Dept. of Human Movement Sciences, Federal University of São Paulo, Federal University of São Paulo, Brazil. Lofrano-Prado is with the Nutrition and Exercise Research Group, University of Pernambuco, Pernambuco, Brazil. Oyama is with the Dept. of Psychology, Federal University of São Paulo, Brazil. Cardel is with the Dept. of Pediatrics, University of Colorado, Denver, CO. Gomes, Andrade, and Freitas are with the Physical Education Postgraduate Program, University of Pernambuco, Pernambuco, Brazil. Balagopal is with the Nemours Children’s Clinic, Jacksonville, FL. Hill is with the Colorado Center for Health and Wellness, University of Colorado, Denver, CO.