The objective is to describe the interaction of equal doses of NPH insulin (Neutral Protamine Hagedorn), insulin Detemir and insulin glargine on IGFBP-1 (Insulin-like Growth Factor Binding Protein-1) production as well as immunoreactive and bioactive IGF-I (Insulin-like Growth Factor-I) after once-daily injection on three separate visits in type 1 diabetic subjects.