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Athough the incidence of type 2 diabetes mellitus (type 2 DM) in chidren and adolescents has increased in recent years, type 1 diabetes mellitus (type 1 DM) is the most prevalent type seen in this age group and is reviewed in more detail here. Within the context of sport participation, most patients seen by pediatricians are adolescents and although the following discussion mostly refers to adolescents, it is equally applicable to children unless otherwise specified.

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Definitions

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The diagnostic criteria for diabetes mellitus are shown in Table 15-1.

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Table Graphic Jump Location
Table 15-1. American Diabetic Association Diagnostic Criteria for Diabetes Mellitus 
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Epidemiology

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There are 20.8 million individuals in the United States with diabetes mellitus, comprising 7% of the total population; 176,500 of them are children and adolescents younger than 20 years of age. One in 400 to 600 children and adolescents have insulin-dependent diabetes, also called type 1 DM.1

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Pathogenesis

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A brief summary of the pathophysiology of diabetes mellitus as it relates to sports participation is essential to better understand the principles of management of diabetes in children and adolescents.

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The availability of carbohydrates is important for use by the exercising muscles. Nondiabetic children and adolescents have full muscle and liver glycogen stores at rest. During exercise, muscle glycogen is used first to release lactic acid for the Cori cycle, followed quickly by liver glycogenolysis. As insulin levels decrease, liver glycogenolysis is continued; at the same time, with increased blood flow, binding of insulin to receptors in skeletal muscles is increased causing increased glucose uptake and metabolism during exercise. The glycogen stores in muscles and liver are then replenished from blood glucose following completion of physical activity.2–4

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It is believed that hepatic glucose production is the same in children and adolescents with diabetes and those without diabetes. However, there ...

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