Exclusion Criteria:Subjects will be excluded if they have received any form of manipulative treatment in the 3 months prior to enrolling in the study. Subjects with acute respiratory illness, such as an exacerbation of COPD, acute bronchitis, or pneumonia will be excluded from the study. Persons unable to cooperate and follow instructions to complete pulmonary function testing due to dementia or other cognitive disorders will be excluded as will persons with spinal scoliosis greater than 25 degrees, significant chest wall deformity, and acute rib or compression fracture of the vertebra, unstable angina, or unstable congestive heart failure.