1. Specific Aim #1: Compare the performance of the flow-volume test device to standard pulmonary function measurements.
The investigators hypothesize that measurements of inspiratory capacity with the Respimetrix test device will:
A. Accurately measure the inspiratory capacity as assessed on standard pulmonary function tests, and will B. Correlate with other measures of pulmonary function including spirometry (vital capacity, forced expiratory volume in 1 second) and lung volumes (total lung capacity, functional residual capacity and residual volume).
2. Specific Aim #2: Examine the ability of the flow-volume test device to track changes in standard pulmonary function measurements after the administration of an inhaled bronchodilator.
The investigators hypothesize that the Respimetrix test device will:
A. Accurately measure changes in inspiratory capacity in response to a standard dose of a short acting inhaled beta-agonist (4 puffs albuterol), B. Correlate with immediate changes in pulmonary function parameters including spirometry (vital capacity, forced expiratory volume in 1 second) and lung volumes (total lung capacity, functional residual capacity and residual volume).
