Relationship between FVC and respiratory muscle strength in patients with amyotrophic Lateral sclerosis (ALS)

Aim:The aim of this study was to analyze the relationship between Forced Vital Capacity (FVC) and respiratory muscle strength in Amyotrophic Lateral Sclerosis (ALS) patients and healthy subjects. Methods: We study 31 ALS patients and 28 healthy subjects by spirometry and respiratory muscle strength assessment (PImax, PEmax and SNIP). Patients were classified in relation to FVC in two grades FVC ≥ 75%pred. or FVC