PURPOSE: This study aimed to test the effects of a circuit training (CT; aerobic+strength training) program, with and without motivational interviewing (MI) behavioral therapy, on reducing adiposity and type 2 diabetes risk factors in Latina teenagers. METHODS: Thirty-eight Latina adolescents (15.8 +/- 1.1 yr) who are overweight/obese were randomly assigned to control (C; n = 12), CT (n = 14), or CT+MI (n = 12). The CT classes were held twice a week (60 to 90 min) for 16 wk. The CT+MI group also received individual or group MI sessions every other week. The following were measured before and after intervention: strength by one-repetition maximum; cardiorespiratory fitness (VO2max) by submaximal treadmill test; physical activity by accelerometry; dietary intake by records; height, weight, waist circumference; total body composition by dual-energy x-ray absorptiometry; visceral adipose tissue, subcutaneous adipose tissue, and hepatic fat fraction by magnetic resonance imaging; and glucose/insulin indices by fasting blood draw. Across-intervention group effects were tested using repeated-measures ANOVA with post hoc pairwise comparisons. RESULTS: CT and CT+MI participants, compared with controls, significantly increased fitness (+16% and +15% versus -6%, p = 0.03) and leg press (+40% versus +20%, p = 0.007). Compared with controls, CT participants also decreased waist circumference (-3% versus +3%; p < 0.001), subcutaneous adipose tissue (-10% versus 8%, p = 0.04), visceral adipose tissue (-10% versus +6%, p = 0.05), fasting insulin (-24% versus +6%, p = 0.03), and insulin resistance (-21% versus -4%, p = 0.05). CONCLUSIONS: CT may be an effective starter program to reduce fat depots and improve insulin resistance in Latino youth who are overweight/obese, whereas the additional MI therapy showed no additive effect on these health outcomes.

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