Muscular weakness and respiratory failure.
D006801:Humans; D008875:Middle Aged; D009135:Muscular Diseases / Q000150:complications* / Q000503:physiopathology; D010807:Physical Endurance; D012044:Regression Analysis; D012119:Respiration; D012129:Respiratory Function Tests; D012131:Respiratory Insufficiency / Q000209:etiology* / Q000503:physiopathology