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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Hopkins, Nicola Dominique Tinken, Toni M. Cable, N. Tim Green, Daniel J. McWhannell, Nicola Graves, Lee E. Stratton, Gareth Ridgers, Nicola D. |
| Description | Country affiliation: United kingdom Author Affiliation: Hopkins ND ( Research Institute for Sport and Exercise Science, Liverpool John Moore's University, Liverpool, UNITED KINGDOM.) |
| Abstract | 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, 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. |
| ISSN | 01959131 |
| Issue Number | 2 |
| Volume Number | 43 |
| e-ISSN | 15300315 |
| Journal | Medicine & Science in Sports & Exercise |
| Language | English |
| Publisher | Lippincott Williams & Wilkins (on behalf of the American College of Sports Medicine) |
| Publisher Date | 2011-02-01 |
| Publisher Place | United States |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Motor Activity Physiology Seasons Vasodilation Absorptiometry, Photon Body Composition Brachial Artery Child Cohort Studies Female Humans Male Ultrasonography Journal Article Research Support, Non-u.s. Gov't Discipline Sports Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science |
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