Parkinson's disease is a brain disease. Even though the disease has several physical symptoms, such as tremors, inertia or freezing, the muscles themselves are not affected by Parkinson’s disease. Muscle strength can be reduced in people with Parkinson's disease, not because the muscle itself is damaged, but because the brain’s control on the muscle is reduced, and partly because the muscles are used less intensively (and therefore become weaker). 


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