Self-reported versus accelerometer measured physical activity & cardiometabolic biomarkers among youth in NHANES

Wednesday, October 10, 2012 — Poster Session II
Noon – 2:00 p.m	Natcher Conference Center, Building 45	NCI	CULT/SOC SCI-1

* FARE Award Winner

Authors

• B Belcher
• R Moser
• K Dodd
• A Atienza
• R Ballard-Barbash
• D Berrigan

Abstract

The discrepancy in self-report & accelerometer moderate-to-vigorous physical activity (MVPA) estimates may influence relationships with obesity-related biomarkers. We aim to compare associations between self-report & accelerometer MVPA & biomarkers. Youth ages 12-19 (N=2174; 1110 boys) from the 2003-6 NHANES with self-report MVPA & four 10-hour days of accelerometry (Actigraph 7164) were included. Biomarkers were: body mass index (BMI, kg/m2), BMI percentile, height & waist circumference (WC, cm), triceps skinfold (mm), high-density lipoprotein (HDL, mg/dl), systolic & diastolic blood pressure (BP, mmHg), & glycohemoglobin (%). Each biomarker was regressed on accelerometer (min/day) & self-report (min/week), stratified by sex. Covariates were age, race, SES, physical limitations, & asthma. Girls recorded less activity (self-report: 160.0(16.1) vs. 214.4(12.2) min/week; accelerometer: 18.2(0.9) vs. 33.6(1.3) min/day; p<0.05). In boys, accelerometer MVPA was inversely associated with BMI, BMI percentile, height, WC, & triceps skinfold; & positively associated with HDL & glycohemoglobin (p<0.05 for all); self-report MVPA was inversely associated with diastolic BP (p=0.001). In girls, accelerometer MVPA was inversely associated with systolic BP (p=0.046); self-report MVPA was not associated with any biomarkers. Accelerometry showed stronger associations with biomarkers than self-report, particularly in boys. These findings contribute to our understanding of how physical activity relates to biomarkers.

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