title: A school-based exercise intervention elicits substantial bone health benefits: a 2-year randomized controlled trial in girls.
abstract: OBJECTIVE
  Childhood weight-bearing physical activity is recognized as an important determinant of peak bone mass, and physical activity intervention may represent a feasible strategy for primary prevention of osteoporosis. Previous school-based exercise interventions have all been of <10 months in duration. We implemented a high-impact, circuit-based, jumping intervention (10 minutes, 3 times a week) over 2 school years and compared changes in bone mineral content (BMC) over 20 months (2 school years) in 9.9 +/- 0.6-year-old intervention girls (N = 32) and controls (10.3 +/- 0.4 years, N = 43).
  
  
  METHODS
  We measured BMC for the total body, lumbar spine, proximal femur (and femoral neck and trochanteric subregions), and lean and fat mass by dual-energy radiograph absorptiometry (Hologic QDR 4500), and height, sitting height, leg length, and weight at baseline and 20 months. We assessed Tanner stage, general physical activity, and calcium intake by questionnaire.
  
  
  RESULTS
  Girls were Tanner breast stage 1 to 3 at baseline. There were no significant differences in baseline or 20-month change in body size or composition, average physical activity, or calcium intake between groups. There were substantially greater gains in lumbar spine (41.7% vs 38.0%) and femoral neck (24.8% vs 20.2%) BMC in intervention than in control girls (P <.05, analysis of covariance; covariates were baseline BMC and height, change in height, physical activity, and final Tanner stage).
  
  
  CONCLUSIONS
  Three brief sessions of high-impact exercise per week implemented over 2 consecutive years within the elementary school curriculum elicited a substantial bone mineral accrual advantage in pubertal girls.
authors.affiliation: Endocrinology and Diabetes Unit, British Columbia Children's Hospital and Food, Nutrition and Health, Canada.
authors.forename: Kerry J
authors.initials: KJ
authors.lastname: MacKelvie
authors.forename: Karim M
authors.initials: KM
authors.lastname: Khan
authors.forename: Moira A
authors.initials: MA
authors.lastname: Petit
authors.forename: Patricia A
authors.initials: PA
authors.lastname: Janssen
authors.forename: Heather A
authors.initials: HA
authors.lastname: McKay
mesh_terms: D015502:Absorptiometry, Photon; D000886:Anthropometry; D015519:Bone Density / Q000502:physiology*; D002648:Child; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D010806:Physical Education and Training; D012574:Schools