Inspiratory capacity (IC) at peak time and at isotime were the primary pharmacodynamic (PD) variables of interest. IC was measured at two minute intervals during exercise. Isotime was defined as the time the subject was still exercising in the shortest of all sub-maximal exercise tests (3-minutes resting pedaling, 3-minutes unloaded pedaling and exercise with loaded pedaling). Peak time was defined as the last measurement taken in the exercise period. The primary analysis consisted of a linear mixed effects model with baseline IC measurement as covariate.