Exertional dyspnea:  a primary complaint in unusual cases of progressive muscular atrophy and amyotrophic lateral sclerosis.
D000690:Amyotrophic Lateral Sclerosis; D004417:Dyspnea / Q000209:etiology*; D006801:Humans; D009134:Muscular Atrophy, Spinal; D009136:Muscular Dystrophies
AMYOTROPHIC LATERAL SCLEROSIS/manifestations; DYSPNEA/etiology and pathogenesis; PROGRESSIVE MUSCULAR DYSTROPHY/manifestations