Fitness trackers may be trendy, but there’s no evidence these devices raise activity levels enough to improve health, even with financial rewards, a new study suggests.

Many U.S. employers have incorporated wearable devices into their employee wellness programs, although rigorous evidence on their long-term health impact is lacking.

Now researchers have reported results of a controlled trial to test activity trackers. They compared full-time employees using the devices under various conditions with a control group.

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