The goal of this study was to compare plasma nitric oxide (NO) concentrations in healthy subjects, defined as either insulin-resistant or insulin-sensitive on the basis of the plasma insulin response to a 75-g oral glucose challenge. For this purpose, 404 healthy subjects were divided into quartiles on the basis of the plasma insulin response to glucose, and 49 individuals were selected from the quartile with the lowest insulin response and 49 from the quartile with the highest insulin response. The two groups of 49 each were selected to be essentially identical in terms of age, gender distribution, body mass index (BMI), and waist to hip ratio (WHR).
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