4.5 Article

HEALTHY study rationale, design and methods: moderating risk of type 2 diabetes in multi-ethnic middle school students

期刊

INTERNATIONAL JOURNAL OF OBESITY
卷 33, 期 -, 页码 S4-S20

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NATURE PUBLISHING GROUP
DOI: 10.1038/ijo.2009.112

关键词

type 2 diabetes; adolescents; primary prevention

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The HEALTHY primary prevention trial was designed and implemented in response to the growing numbers of children and adolescents being diagnosed with type 2 diabetes. The objective was to moderate risk factors for type 2 diabetes. Modifiable risk factors measured were indicators of adiposity and glycemic dysregulation: body mass index >= 85th percentile, fasting glucose >= 5.55 mmol l(-1) (100 mg per 100 ml) and fasting insulin >= 180 pmol l(-1) (30 mu U ml(-1)). A series of pilot studies established the feasibility of performing data collection procedures and tested the development of an intervention consisting of four integrated components: (1) changes in the quantity and nutritional quality of food and beverage offerings throughout the total school food environment; (2) physical education class lesson plans and accompanying equipment to increase both participation and number of minutes spent in moderate-to-vigorous physical activity; (3) brief classroom activities and family outreach vehicles to increase knowledge, enhance decision-making skills and support and reinforce youth in accomplishing goals; and (4) communications and social marketing strategies to enhance and promote changes through messages, images, events and activities. Expert study staff provided training, assistance, materials and guidance for school faculty and staff to implement the intervention components. A cohort of students were enrolled in sixth grade and followed to end of eighth grade. They attended a health screening data collection at baseline and end of study that involved measurement of height, weight, blood pressure, waist circumference and a fasting blood draw. Height and weight were also collected at the end of the seventh grade. The study was conducted in 42 middle schools, six at each of seven locations across the country, with 21 schools randomized to receive the intervention and 21 to act as controls (data collection activities only). Middle school was the unit of sample size and power computation, randomization, intervention and primary analysis. International Journal of Obesity (2009) 33, S4-S20; doi:10.1038/ijo.2009.112

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