title: Startup circuit training program reduces metabolic risk in Latino adolescents.
abstract: OBJECTIVE
  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 (60-90 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 (V·O 2max) 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% vs -6%, P = 0.03) and leg press (+40% vs +20%, P = 0.007). Compared with controls, CT participants also decreased waist circumference (-3% vs +3%; P < 0.001), subcutaneous adipose tissue (-10% vs 8%, P = 0.04), visceral adipose tissue (-10% vs +6%, P = 0.05), fasting insulin (-24% vs +6%, P = 0.03), and insulin resistance (-21% vs -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.
authors.affiliation: Department of Preventive Medicine, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA. jaimieda@usc.edu
authors.forename: Jaimie Nicole
authors.initials: JN
authors.lastname: Davis
authors.forename: Lauren E
authors.initials: LE
authors.lastname: Gyllenhammer
authors.forename: Amanda A
authors.initials: AA
authors.lastname: Vanni
authors.forename: Mathew
authors.initials: M
authors.lastname: Meija
authors.forename: Amy
authors.initials: A
authors.lastname: Tung
authors.forename: E Todd
authors.initials: ET
authors.lastname: Schroeder
authors.forename: Donna
authors.initials: D
authors.lastname: Spruijt-Metz
authors.forename: Michael I
authors.initials: MI
authors.lastname: Goran
mesh_terms: D015502:Absorptiometry, Photon; D000293:Adolescent; D002648:Child; D003924:Diabetes Mellitus, Type 2 / Q000517:prevention & control*; D004032:Diet; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D006630:Hispanic or Latino; D006801:Humans; D007333:Insulin Resistance; D015141:Los Angeles; D009042:Motivation; D050177:Overweight; D010809:Physical Fitness / Q000502:physiology*; D055070:Resistance Training / Q000379:methods*