The goal of this observational study is to evaluate the relationship between respiratory function and sarcopenia in people with multiple sclerosis. The main questions it aims to answer are: Is there a relationship between muscle structure and respiratory muscle strength/pulmonary function in MS patients? Undergo a single session of respiratory muscle strength measurement (e.g., maximal inspiratory pressure \[MIP\], maximal expiratory pressure \[MEP\]) Perform spirometry to assess pulmonary function
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Forced Vital Capacity
Timeframe: 1 day (The evaluation will be done one-time)
Forced Expiratory Volume in 1 second (FEV1)
Timeframe: 1 day (The evaluation will be done one-time)
FEV1/FVC Ratio (%)
Timeframe: 1 day (The evaluation will be done one-time)
Maximal Inspiratory Pressure
Timeframe: 1 day (The evaluation will be done one-time)
Maximal Expiratory Pressure
Timeframe: 1 day (The evaluation will be done one-time)