Subjects must have a fasting blood glucose (BG) level of less than 6.1 mmol/L FEV1/ FVC = LLN TLC = 80% Predicted DLco (unc) = 80% Predicted (Miller) No significant improvement in pre- to post-bronchodilator spirometry (defined as an increase of = 12% and = 200 mL in FEV1 or FVC) at Screening FEV1 = 80% (NHANES III Predicted