title: A 6-month trial of resistance training with milk supplementation in adolescents: effects on body composition.
abstract: Fluid milk consumed in conjunction with resistance training (RT) provides additional protein and calcium, which may enhance the effect of RT on body composition. However, the literature on this topic is inconsistent with limited data in adolescents. Therefore, we examined the effects of a supervised RT program (6 mo, 3 d/ wk, 7 exercises, 40-85% 1-repetition maximum) with daily milk supplementation (24 oz/day, one 16-oz dose immediately post-RT) on weight, fat mass (FM), and fat-free mass (FFM) assessed via dual-energy X-ray absorptiometry (baseline, 3 mo, 6 mo) in a sample of middle-school students who were randomly assigned to 1 of 3 supplement groups: milk, isocaloric carbohydrate (100% fruit juice), or water (control). Thirty-nine boys and 69 girls (mean age = 13.6 yr, mean BMI percentile = 85th) completed the study: milk n = 36, juice n = 34, water n = 38. The results showed no significant differences between groups for change in body weight (milk = 3.4 ± 3.7 kg, juice = 4.2 ± 3.1 kg, water = 2.3 ±2.9 kg), FM (milk = 1.1 ±2.8 kg, juice = 1.6 ± 2.5 kg, water = 0.4 ±3.6 kg), or FFM (milk = 2.2 ± 1.9 kg, juice = 2.7 ± 1.9 kg, water = 1.7 ± 2.9 kg) over 6 mo. FFM accounted for a high proportion of the increased weight (milk = 62%, juice = 64%, water = 74%). These results from a sample of predominantly overweight adolescents do not support the hypothesis that RT with milk supplementation enhances changes in body composition compared with RT alone.
authors.affiliation: Div. of Internal Medicine, University of Kansas Medical Center, Kansas City, KS, USA.
authors.forename: Kate
authors.initials: K
authors.lastname: Lambourne
authors.forename: Richard A
authors.initials: RA
authors.lastname: Washburn
authors.forename: Jaehoon
authors.initials: J
authors.lastname: Lee
authors.forename: Jessica L
authors.initials: JL
authors.lastname: Betts
authors.forename: David T
authors.initials: DT
authors.lastname: Thomas
authors.forename: Bryan K
authors.initials: BK
authors.lastname: Smith
authors.forename: Cheryl A
authors.initials: CA
authors.lastname: Gibson
authors.forename: Debra K
authors.initials: DK
authors.lastname: Sullivan
authors.forename: Joseph E
authors.initials: JE
authors.lastname: Donnelly
mesh_terms: D015502:Absorptiometry, Photon; D000293:Adolescent; D000818:Animals; D001628:Beverages; D001823:Body Composition; D001835:Body Weight; D002136:Calcium, Dietary / Q000008:administration & dosage; D004040:Dietary Carbohydrates / Q000008:administration & dosage; D004044:Dietary Proteins / Q000008:administration & dosage; D019587:Dietary Supplements; D002149:Energy Intake; D015444:Exercise; D005260:Female; D005638:Fruit; D006801:Humans; D008297:Male; D008892:Milk; D053580:Muscle Strength; D055070:Resistance Training; D064133:Sports Nutritional Physiological Phenomena
chemical_list: D002136:Calcium, Dietary; D004040:Dietary Carbohydrates; D004044:Dietary Proteins