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Apple’s quest to put a smartwatch on every wrist continues with its latest health research: a new study showing the Apple Watch can be used to monitor symptoms of Parkinson’s disease.

Researchers at Apple, working with specialists who treat Parkinson’s, designed a system that uses the Apple Watch to detect the motor symptoms that are a hallmark of the neurological disease. By monitoring resting tremors and other involuntary movements, the researchers were able to identify the characteristic “on” and “off” patterns of medication’s effects. Their findings were published Wednesday in Science Translational Medicine.

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