Utility of supine spirometry in neuromuscular disease

Primary Objective
1. To test the feasibility and reproducibility of supine spirometry in children with neuromuscular diseases
2. To test the feasibility of supine spirometry in healthy children

Secondary Objectives
1. To collect normative data on supine spirometry in children with and without neuromuscular weakness
2. To correlate the degree of respiratory dysfunction measured by supine spirometry with polysomnography

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