Type A factors as predictors of changes in the metabolic syndrome precursors in adolescents and young adults: A 3-year follow-up study.

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Abstract
The predictive associations of Type A factors with changes in some essential parameters of the cluster of disorders known as metabolic syndrome (Syndrome X) were studied during a 3-year follow-up period in 1,147 randomly selected healthy adolescents and young adults. Type A behavior was measured with the Hunter Wolf A-B Rating Scale. Physiological parameters studied were serum insulin, high-density and low-density lipoprotein cholesterol, triglycerides (TG), systolic and diastolic blood pressure, body-mass index (BMI), subscapular skinfold thickness (SSF), and centrality index. Among the Type A factors in boys and men, high baseline Aggression predicted an increase in the individual parameters of metabolic syndrome (i.e., insulin, TG, SSF, and BMI) as well as a global aggravation of the cluster of metabolic parameters. In girls and women, increases in Eagerness-Energy and Responsibility across the 3 years of follow-up predicted an increase in serum insulin and a decrease in SSF, respectively.

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