AIMS/HYPOTHESES: Physical inactivity may contribute to islet autoimmunity and progression to clinical type 1 diabetes. To test this hypothesis, we evaluated physical activity, assessed by accelerometer, as an independent risk factor for progression to clinical diabetes among genetically at risk for type 1 diabetes children and youth with islet autoimmunity. METHODS: Accelerometer data were obtained for 95 children and youth participating in the diabetes autoimmunity study in the young who had islet autoimmunity. Islet autoimmunity was defined as the presence of islet autoantibodies to insulin, glutamic acid decarboxylase, tyrosine phosphatase-like protein IA-2, or zinc transporter 8. RESULTS: During prospective follow-up for up to 7 years, 13 of the 95 participants progressed to clinical diabetes. In multivariable survival analysis, none of the physical activity parameters examined predicted a higher risk of developing diabetes. In survival analysis with time-varying physical activity parameters, none of the physical activity parameters over time were associated with the risk of developing type 1 diabetes. CONCLUSIONS/ INTERPRETATION: It does not appear that low-physical activity is a risk factor for progression from islet autoantibodies to diabetes in children and youth at high-genetic risk for type 1 diabetes.
AIMS/HYPOTHESES: Physical inactivity may contribute to islet autoimmunity and progression to clinical type 1 diabetes. To test this hypothesis, we evaluated physical activity, assessed by accelerometer, as an independent risk factor for progression to clinical diabetes among genetically at risk for type 1 diabetes children and youth with islet autoimmunity. METHODS: Accelerometer data were obtained for 95 children and youth participating in the diabetes autoimmunity study in the young who had islet autoimmunity. Islet autoimmunity was defined as the presence of islet autoantibodies to insulin, glutamic acid decarboxylase, tyrosine phosphatase-like protein IA-2, or zinc transporter 8. RESULTS: During prospective follow-up for up to 7 years, 13 of the 95 participants progressed to clinical diabetes. In multivariable survival analysis, none of the physical activity parameters examined predicted a higher risk of developing diabetes. In survival analysis with time-varying physical activity parameters, none of the physical activity parameters over time were associated with the risk of developing type 1 diabetes. CONCLUSIONS/ INTERPRETATION: It does not appear that low-physical activity is a risk factor for progression from islet autoantibodies to diabetes in children and youth at high-genetic risk for type 1 diabetes.
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