Associations of childhood physical activity and screen time with cardiometabolic health in preteens who were born to mothers with previous macrosomic delivery: Findings from the ROLO longitudinal birth cohort study.

Background: Macrosomia (birthweight ≥4 kg) may alter the associations of physical activity (PA) and screen time (ST) throughout childhood with later cardiometabolic risk.

Objective: To investigate associations of PA and ST over a 4-6-year follow-up period with cardiometabolic outcomes in preteens (9-11-year-olds) who were born to mothers with previous macrosomic delivery.

Methods: This is an analysis of 402 preteens from the ROLO study, who were born to mothers that previously delivered an infant with macrosomia. Parental-reported measures of PA and ST were obtained in early childhood at 5-years of age. Preteen self-reported PA, parental-reported ST, anthropometry, dual-energy x-ray absorptiometry, blood pressure, heart rate, cardiorespiratory endurance, and blood biomarkers were obtained at 9-11-years. Crude and adjusted linear regression models explored associations and the interaction of birthweight was investigated in all models.

Results: Early childhood PA and ST at the 5-year follow-up were not related to preteen cardiometabolic outcomes. In adjusted models, higher preteen PA was associated with lower sum of skinfolds (B = -3.00, 95% CI -5.98, -0.02, p = 0.048) and higher cardiorespiratory endurance (B = 0.50, 95% CI 0.20, 0.80, p = 0.001) at the same time point. No strong evidence for modification by birthweight was found.

Conclusion: Higher preteen PA may have potential benefits for cardiometabolic health, irrespective of birthweight.