The excessive muscle contraction that Parkinson's Disease causes can affect the muscles that control respiration. Consequently, the breathing rate in Parkinson's Disease can often not be sustained as well, and breathing efficiency can be reduced . There is often abnormal ventilatory control despite normal lung volumes and flows . Respiratory muscle strength and endurance also are decreased
Due to the reduced respiratory capacity, people with Parkinson's Disease are more prone to the effects of pneumonia, which occurs more commonly than expected in Parkinson's Disease, but not because of Parkinson's DiseaseConsequently, pneumonia is the most common cause of death associated with Parkinson's Disease However, death certificates indicated that Parkinson's Disease was a substantial contributor to the cause of death in only 20% of people with Parkinson's Disease. For 80% of people there were other causes.
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