Fitness trackers look attractive – but how effective are they?

Experts claim that getting people to set goals — and then reminding them of their goals — absolutely works, and the wearable devices for exercise and fitness are built to do just that.

Fitbit is taking advantage of this latest trend by openly advertising their products infront of the New York exchange. Actress Jordana Brewster demonstarted the use of multiple products this Friday while working out with fitness expert Harley Pasternak.

“Millennials seem to be wired for this kind of data, this kind of feedback,” says Dr. Jason Mendoza, who is running small studies to see if the devices will help teenagers.

Strapped to your wrist, shoe, or clothes, fitness trackers can collect lot of data: how many steps you’ve taken, where you’ve run, how many calories you’ve burned, how fast your heart is beating, how much oxygen you’ve got in your blood, and how well you’re sleeping. The best part is that you can sync it with your smartphones!

They can quantify how active you are, and it’s satisfying to set a goal, beat it and then set an even higher goal!

That might be why fitness trackers are one of the first types of wearable technology to really take off. International Data Corp. says more than 11 million of the devices were sold in the first quarter of this year, triple sales from a year ago. Fitbit’s product sales doubled and revenue nearly tripled in 2014.

In one of the few completed clinical trials of fitness trackers, Dr. Lisa Cadmus-Bertram found that overweight middle-aged and older women who used a Fitbit got about an hour of additional exercise a week. A group of women who were given pedometers didn’t improve.

Cadmus-Bertram thinks that if the women had received more support they might have experienced even bigger gains. But the study involved a specific group of women — they were around 60 years old, white and affluent. And they still didn’t reach the activity goals that experts recommend.

The results were published in American Journal of Preventive Medicine this month. Cadmus-Bertram is preparing to launch additional studies on Garmin’s Vivofit tracker and plans to test the LED-based heartbeat sensors in some activity trackers to see if their measurements are accurate. She said it’s hard for researchers to keep up with the pace of innovation and new features to determine if they are really useful.

However, scientific evidence which shows that people get healthier when using fitness trackers is limited because they are new and studies of them have mostly been small or focused on specific groups of people.

Dr. Daniel Neides of the Cleveland Clinic says a simple Pebble+ fitness tracker helped him get in the best shape of his life. And Neides says he’s not alone: the clinic started offering the devices to employees in 2013 in a program intended to reduce its costs. Employees who met step-counting or activity goals could save about $2,000 a year in out-of-pocket health care spending.

Neides said the program reduced medication costs, emergency room visits and hospitalizations, and sick days. He said the clinic had tried a similar program without fitness trackers, but it didn’t work very well.

“Human nature indicates that for a lot of us, we just need a gentle nudge in the right direction,” he said. “I look at it like a report card. I have a goal. I want to get an A. For me, getting an A is hitting 10,000 steps every single day.”

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