The wristband may help the doctor in determining which patients with major depressive disorder will respond best to commonly prescribed drugs such as Prozac."Selective serotonin reuptake inhibitors, or SSRIs, are today's mainstay for depression treatment but patients and their physicians may go through many months, doses, and different SSRIs trying to get results," said W. Vaughn McCall from Medical College of Georgia at Georgia Regents University.

McCall said the simple wristband may help by identifying those commonly referred to as "night owls", who appear to be the best responders to SSRIs.

"The rest-activity pattern of patients may be one of the first biomarkers to emerge. It gives us a place to start," McCall explained.The study appeared in the Journal of Psychiatric Research.

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