In healthy individuals, muscles contract with movement and relax at rest. However, those with Parkinson's experience stiff muscle tone. This means the muscles of an affected body part do not relax completely even at rest. This leads to a limited range of motion, which is uncomfortable and sometimes painful. This muscle rigidity is mostly felt in the shoulders, trunk, limbs, or neck, though it can occur anywhere in the body. Many affected individuals do not swing their arms while walking, for example, due to muscle rigidity.
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