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Sex Differences in the Associations of Physical Activity and Macronutrient Intake with Child Body Composition: A Cross-sectional Study of 3- to 7-year-olds in Samoa

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Journal Pediatr Obes
Date 2020 Jan 12
PMID 31925928
Citations 7
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Abstract

Background: Overweight/obesity is prevalent among children in the Pacific Islands, but its aetiology is poorly understood. Few studies have considered body composition in addition to body mass index-based measures.

Objectives: To describe body composition among Samoan children and determine sex-specific associations among dietary intake, physical activity, and body composition.

Methods: Body composition (percent body fat [%BF], lean mass, and trunk-to-peripheral fat ratio) of n = 83 Samoan children (3-7 y) was assessed using dual-energy X-ray absorptiometry. Children completed 7 days of objective physical activity monitoring. Mothers reported child nutritional intake using a 115-item food frequency questionnaire. Stepwise generalized linear regression was used to determine independent associations of nutritional intake and physical activity with body composition.

Results: Samoan children had higher average %BF than reported among other ethnic groups but lower trunk-to-peripheral fat ratios. In sex-stratified analyses, quartile of carbohydrate intake was negatively associated with %BF (β = -2.02 SE = 0.58; P < .001) in girls only. Among boys, physical activity (quartile of accelerometer counts per minute) was negatively associated with %BF (β = -1.66 SE = 0.55; P < .01).

Conclusions: Sex differences in the associations among nutritional intake, physical activity, and body composition may be important to consider as interventions are developed to address overweight/obesity among Samoan children.

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