Seasonal reduction in physical activity and flow-mediated dilation in children

Hopkins, Nicola Dominique, Stratton, Gareth, Tinken, Toni M., Ridgers, Nicola D., Graves, Lee E., McWhannell, Nicola, Cable, N. Tim and Green, Daniel J. 2011, Seasonal reduction in physical activity and flow-mediated dilation in children, Medicine and science in sports and exercise, vol. 43, no. 2, pp. 232-238.

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Title Seasonal reduction in physical activity and flow-mediated dilation in children
Author(s) Hopkins, Nicola Dominique
Stratton, Gareth
Tinken, Toni M.
Ridgers, Nicola D.
Graves, Lee E.
McWhannell, Nicola
Cable, N. Tim
Green, Daniel J.
Journal name Medicine and science in sports and exercise
Volume number 43
Issue number 2
Start page 232
End page 238
Publisher Lippincott Williams & Wilkins
Place of publication Philadelphia, PA
Publication date 2011-02
ISSN 0195-9131
1530-0315
Keyword(s) endothelial function
nitric oxide
seasonal variation
body composition
Summary Purpose: Cardiovascular disease is a process that has its origins in childhood. Endothelial dysfunction is the earliest detectable manifestation of cardiovascular disease. This study aimed to assess the impact of seasonal changes in physical activity (PA) and body composition on conduit artery endothelial function in children.

Method: We studied 116 children (70 girls aged 10.7 ± 0.3 yr and 46 boys aged 10.7 ± 0.3 yr) on two occasions; in the northern summer (June) and late autumn (November). We assessed flow-mediated dilation (FMD) using high-resolution Doppler ultrasound. Body composition was measured by dual-energy x-ray absorptiometry. PA was assessed using accelerometry.

Results: FMD (10.0% ± 4.3% to 7.9% ± 3.9%, P < 0.001) and PA (94.1 ± 34.8 to 77.8 ± 33.7 min·d-1, P < 0.01) decreased, while percentage body fat increased (27.6% ± 6.8% to 28.0% ± 6.6%, P < 0.001) between summer and autumn. Decreases in FMD correlated with decreases in high-intensity PA (r = 0.23, P = 0.04), and change in high-intensity PA was the only predictor of change in FMD. No relationships were evident between changes in body composition and FMD.

Conclusions: Vascular function decreased between summer and autumn in this cohort. There were no relationships between change in FMD and changes in body composition or low/moderate-intensity PA. The associations between FMD and high-intensity PA suggests that future interventions should encourage this form of behavior, particularly at the times of year associated with lower PA.
Language eng
Field of Research 110602 Exercise Physiology
Socio Economic Objective 920103 Cardiovascular System and Diseases
HERDC Research category C1.1 Refereed article in a scholarly journal
Copyright notice ©2011, American College of Sports Medicine
Persistent URL http://hdl.handle.net/10536/DRO/DU:30032573

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