Multiple sclerosis is a neurological disease that can affect lung function and cough efficacy. This pilot study will examine whether the lung volume recruitment technique can slow down the decline in lung function and cough.

Inclusion Criteria:

• History of multiple sclerosis, diagnosed by a neurologist in accordance with the 2010 McDonald criteria

Exclusion Criteria:

• Concomitant parenchymal pulmonary disease or pleural disease
• Symptomatic cardiomyopathy
• Unable to perform pulmonary function testing or lung volume recruitment, due to comprehension or cooperation issues, physical inability such as bulbar or cerebellar dysfunction
• Contra-indication to pulmonary function testing or lung volume recruitment such as myocardial infarction, bleeding aortic aneurysm, intracranial hemorrhage within the previous month
• Known susceptibility to pneumothorax or pneumomediastinum
• Not competent to provide informed consent