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A new study claims that the popular Fitbit device delivers inaccurate readings of the user's heart rate. 

The wearable technology tracks the user's steps over the course of a day, monitoring activity based on changes in heart rate.

The study, performed at California State Polytechnic University, was commissioned by a law firm representing people in a class-action lawsuit against Fitbit.

According to one attorney, the study found that the Fitbit devices' PurePulse heart monitor misread heart rates by an average of 20 beats per minute.

The lawsuit contends that Fitbit is committing consumer fraud and putting people who rely on the readings at risk.

Fitbit argued that the results were biased and motivated by the lawsuit's financial goals. 

"It was paid for by plaintiffs' lawyers who are suing Fitbit, and was conducted with a consumer-grade electrocardiogram – not a true clinical device, as implied by the plaintiffs' lawyers. Furthermore, there is no evidence the device used in the purported 'study' was tested for accuracy," the company said in a statement.

The company also shared on Instagram a testimonial from a man who says the Fitbit, coupled with dietary changes, helped him drop nearly 200 pounds.

What do you think of the dispute?


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