This study evaluates the effects of a 10-week inspiratory muscle training on the outcomes of respiratory muscle strength, fatigue, activity participation, and respiratory infection rates in persons with advanced Multiple Sclerosis (MS). Participants will perform daily exercise using the Threshold Inspiratory Muscle Trainer (IMT) device during the training period. The study will assess whether the participants improve after the training, and whether the effects can be maintained after the training ends.
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Change in Maximal inspiratory Pressure (MIP)
Timeframe: Baseline to 28 weeks
Change in Maximal Expiratory Pressure (MEP)
Timeframe: Baseline to 28 weeks