Relationships Among Diet, Physical Activity, and Dual Plane Dual-energy X-ray Absorptiometry Bone Outcomes in Pre-pubertalgirls

Overview

Journal Arch Osteoporos

Publisher Springer

Date 2017 Feb 16

PMID 28197890

Citations 3

Authors

Jie Ren

Lynn S Brann

Kay S Bruening

Tamara A Scerpella

Jodi N Dowthwaite

Affiliations

Soon will be listed here.

Abstract

Purpose: Childhood development sets the baseline for adult fracture risk. Most studies evaluate development using postero-anterior (PA) dual-energy X-ray absorptiometry (DXA) areal bone mineral density, bone mineral content, and bone mineral apparent density. In a prior analysis, we demonstrated that PA DXA reflects posterior element properties, rather than vertebral body fracture sites, such that loading is associated with subtle differences in vertebral body geometry, not 3D density. The current analysis is restricted to pre-pubertal girls, for a focused exploration of key nutrient intakes and physical activity as factors in dual plane indices of vertebral body geometry, density, and strength.

Methods: This cross-sectional analysis used paired PA and supine lateral (LAT) lumbar spine DXA scans to assess "3D" vertebral body bone mineral apparent density (PALATBMAD), "3D" index of structural strength in axial compression (PALATIBS), and fracture risk index (PALATFRI). Diet data were collected using the Youth/Adolescent Questionnaire (YAQ, 1995); organized physical activity was recorded via calendar-based form. Pearson correlations and backward stepwise multiple linear regression analyzed associations among key nutrients, physical activity, and bone outcomes.

Results: After accounting for activity and key covariates, fiber, unsupplemented vitamin B, zinc, carbohydrate, vitamin C, unsupplemented magnesium, and unsupplemented calcium intake explained significant variance for one or more bone outcomes (p < 0.05). After adjustment for influential key nutrients and covariates, activity exposure was associated with postero-anterior (PA) areal bone mineral density, PA bone mineral content, PA width, lateral (LAT) BMC, "3D" bone cross-sectional area (coronal plane), "3D" PALATIBS, and PALATFRI benefits (p < 0.05).

Conclusions: Physical activity, fiber intake, and unsupplemented B intake appear to influence vertebral body bone mass, density, geometry, and strength in well-nourished pre-pubertal girls; high fiber intakes may adversely affect childhood vertebral body growth.

Citing Articles

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A 2-yr, School-Based Resistance Exercise Pilot Program Increases Bone Accrual in Adolescent Girls.

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