Vital capacity, forced expiratory volume in 1 second and forced vital
capacity decreased, residual volume and ratio of residual volume to total lung
capacity increased in both PD and MSA groups compared to controls (p,0.05).
Diffusing capacity was decreased in the MSA group, compared with PD and normal
elderly control groups (p,0.05). Respiratory muscle strength was lower in both PD
and MSA groups than in controls (p,0.05).