Bone mineral response to a 7-month randomized controlled, school-based jumping intervention in 121 prepubertal boys: associations with ethnicity and body mass index
| Autor: | Heather A. McKay, K. J. MacKelvie, O. Moran, Moira A. Petit, Karim M. Khan |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
musculoskeletal diseases
Male medicine.medical_specialty Time Factors Endocrinology Diabetes and Metabolism Physical exercise medicine.disease_cause White People law.invention Body Mass Index Jumping Randomized controlled trial Asian People law Bone Density Internal medicine medicine Humans Orthopedics and Sports Medicine Child Exercise Completely randomized design Bone mineral Schools business.industry Surgery Quartile Lean body mass business Body mass index |
| Zdroj: | Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research. 17(5) |
| ISSN: | 0884-0431 |
| Popis: | We examined the effects of a 7-month jumping intervention (10 minutes, 3 times per week) on bone mineral gain in prepubertal Asian and white boys (10.3+/-0.6 years, 36.0+/-9.2 kg) at 14 schools randomized to control (n = 60) and intervention (n = 61) groups. Intervention and control groups had similar mean baseline and change in height, weight, lean mass and fat mass, baseline areal bone mineral density (aBMD; g/cm2), bone mineral content (BMC; g; dual-energy X-ray absorptiometry [DXA], QDR 4500W), and similar average physical activity and calcium intakes. Over 7 months, the intervention group gained more total body (TB) BMC (1.6%,p0.01) and proximal femur (PF) aBMD (1%, p0.05) than the control group after adjusting for age, baseline weight, change in height, and loaded physical activity. We also investigated the 41 Asian and 50 white boys (10.2+/-0.6 years and 31.9+/-4.4 kg) who were below the 75th percentile (19.4 kg/m2) of the cohort mean for baseline body mass index (BMI). Boys in the intervention group gained significantly more TB and lumbar spine (LS) BMC, PF aBMD, and trochanteric (TR) aBMD (+ approximately2%) than boys in the control group (adjusted for baseline weight, final Tanner stage, change in height, and loaded physical activity). Bone changes were similar between Asians and whites. Finally, we compared the boys in the control group (n = 16) and the boys in the intervention group (n = 14) whose baseline BMI fell in the highest quartile (10.5+/-0.6 years and 49.1+/-8.2 kg). Seven-month bone changes (adjusted as aforementioned) were similar in the control and intervention groups. In summary, jumping exercise augmented bone mineral accrual at several regions equally in prepubertal Asian and white boys of average or low BMI, and intervention effects on bone mineral were undetectable in high BMI prepubertal boys. |
| Databáze: | OpenAIRE |
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