Acute insulin responses to arginine ( AIRarg ) were measured at baseline and after 6 months of treatment with 5 days of drug washout under fasting , 230 mg/dL ( glucose potentiation of arginine-induced insulin release [ AIRpot ] ) , and 340 mg/dL ( maximum arginine-induced insulin release [ AIRmax ] ) hyperglycemic clamp conditions , in which AIRmax provides the - cell secretory capacity .