Go to  Advanced Search

Effects of a school-based physical activity model on cardiovascular disease risk factors in children

Show full item record

Files in this item

Files Size Format Description   View
ubc_2007-267806.pdf 14.80Mb Adobe Portable Document Format   View/Open
 
Title: Effects of a school-based physical activity model on cardiovascular disease risk factors in children
Author: Reed, Katharine
Degree Doctor of Philosophy - PhD
Program Human Kinetics
Copyright Date: 2006
Abstract: Background: The prevalence of CVD risk factors in children is high. Physical activity is linked with cardiovascular health but 50% of children are not considered active enough to maintain good health. Objectives: The primary objectives were to; i) evaluate the prevalence of established and novel CVD risk factors in elementary school children, and ii) assess the effect of a school-based physical activity model on selected GVD risk factors. Research design: A 16-month cluster-randomized controlled school-based intervention with the research questions addressed in 6 sub-studies. Sub-studies 1- 4 are cross sectional analyses of baseline data. Substudies 5 and 6 are results from 1-school year of the randomized controlled trial. Methods: Ten schools were randomized to intervention (INT) or control (CON) groups. Children (n=268, aged 9-11 years) from 8 schools took part in Healthy Hearts measurements. The trial aimed to provide children with 150 minutes of moderate-to-vigorous physical activity per week. Anthropometry, physical activity, cardiovascular fitness, blood pressure, arterial compliance, heart rate variability and serum factors were assessed at baseline and final. Results: Study 1:1 developed a Healthy Heart Score to assess potential CVD risk. Girls had a more favourable Healthy Heart Score than boys. 47% of girls and 68% of boys had at least one CVD risk factor. Study 2: Fitness level of Canadian children at the 50t h percentile in 2004 was equivalent to the fitness of Canadian children at the 19th percentile in 1981. Study 3: A significant relationship exists between cardiovascular fitness and arterial compliance in boys and girls. Study 4: Racial differences in heart rate variability exist between Asian- and Caucasian-Canadian children. Sub-study 5: INT children had a 20% greater increase in fitness compared with CON children. Children deemed at higher risk for CVD showed large improvements in blood pressure and serum factors. Sub-study 6: INT boys demonstrated a 25% greater improvement in large artery compliance than CON boys. Conclusions: There was a relatively high prevalence of CVD risk factors in this cohort of children. Action Schools! BC offers promise as a simple, inexpensive strategy for enhancing cardiovascular health in similar children.
URI: http://hdl.handle.net/2429/31051
Series/Report no. UBC Retrospective Theses Digitization Project [http://www.library.ubc.ca/archives/retro_theses/]
Scholarly Level: Graduate

This item appears in the following Collection(s)

Show full item record

All items in cIRcle are protected by copyright, with all rights reserved.

UBC Library
1961 East Mall
Vancouver, B.C.
Canada V6T 1Z1
Tel: 604-822-6375
Fax: 604-822-3893