GSK573719 is a high-affinity specific muscarinic receptor (mAChR) antagonist which is being developed for the treatment of chronic obstructive pulmonary disease (COPD). The long duration of action of GSK573719, when administered via inhalation to humans supports the potential for use as a long acting bronchodilator.This is a randomized, double-blind, placebo-controlled, 5 period cross-over study in healthy male and female volunteers. The study will measure lung function after single inhaled doses from two configurations of the Novel Dry Powder Inhaler. Key assessments will include clinical relevant PD parameters: sGaw, FEV1