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Aerobic Fitness and Cardiometabolic Risk Factors in Elementary School Children
- Presented on May 30, 2014
Background: Aerobic ﬁtness, moderate-to-vigorous physical activity (MVPA), sedentary time (SED) and body mass index (BMI) are all associated with cardio-metabolic risk factors (CMRF) in children. However, few studies have examined the unique contribution of ﬁtness to CMRF accounting for other covariates.
Purpose: To evaluate the association between ﬁtness and CMRF in elementary school children when controlling for socio-demographic variables (age, gender, race, household income), MVPA, SED, and BMI percentile.
Methods: Aerobic ﬁtness (Progressive Aerobic Cardiovascular Endurance Run [PACER] laps), MVPA/ SED over 4 days (ActiGraph GT3X+), height, weight, waist circumference (WC), blood pressure (SBP/DBP), and fasting blood samples were obtained from 2nd and 3rd grade students (N=206: 104 boys, 102 girls; age 7.6±0.6 yrs; BMI percentile: 63.5±28.6; minority: 16.3%). CMRF were compared between unﬁt (lowest 25% ~≤10 PACER laps) and ﬁ t (upper 75%, >10 laps) children after controlling for socio-demographic variables (Model 1) and after additional control for BMI percentile, SED, MVPA (Model 2) using SAS PROC GLM.
Results: See table for adjusted means (standard error). Controlling for sociodemographic variables, fit children had higher HDL and lower insulin, triglycerides, Homeostatic Model Assessment-Insulin Resistance (HOMA-IR), and WC than unfit children (Model 1). After also controlling for MVPA, SED and BMI percentile (Model 2), the significant differences became non-significant with the exception of WC (p=0.04).
Conclusions: CMRF, with the exception of WC, do not differ signiﬁcantly between ﬁt and unﬁt children after controlling for socio-demographic variables, MVPA, SED and BMI percentile.