A Randomized, Double-blind, Placebo Controlled 25-week Trial to Compare the Effect of Tiotropium Inhalation Capsuled (18 Mcg) Once Daily on Exercise Tolerance in Patients With Chronic Obstructive Pulmonary Disease (COPD) Participating in 8 Weeks of Pulmonary Rehabilitation.

Inclusion Criteria:

History of COPD, FEV1 of less than or equal than 60% of predicted normal and less than or equal to 70% at Visit 1, Male or Female 40 years or greater, smoking history of more than 10 pack years (current or ex-smokers), patient can perform all study related tests, patients can inhale medication from HandiHaler and from meter dose inhaler, patients who would benefit from participation in a pulmonary rehab program and patients who had a medical clearance to participate in a pulmonary rehab program.

Exclusion Criteria:

Patients with significant diseases other than COPD, patients with clinically relevant abnormal baseline hematology, blood chemistry or urinalysis, all patients with SGOT greater than 80IU/L, bilirubin greater than 2.0 mg/dl or creatinine greater than 2.0 mg/dL, recent history of MI (6 months or less). any cardiac arrhythmia requiring drug therapy or has abeen hospitalized for heart failure with the past 3 years, active TB, history of CA or had treatment within the last 24 months, history of CF, bronchiectasis, interstitial lung disease or pulmonary thromboembolic disease.