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