Does anyone use a fitbit? I used a heart monitor years ago that you wore with a strap across your chest and a watch device to check your pulse. It gave you a general idea what your pulse was.

Fitbit heart rate tracking is dangerously inaccurate, lawsuit claims

http://www.telegraph.co.uk/technology/news/12086337/Fitbit-heart-rate-tracking-is-dangerously-inaccurate-lawsuit-claims.html

US claimants say heart rates recorded on fitness trackers are well below real ones Claims from fitness tracking company Fitbit that its wristbands can accurately monitor owners' heart rates are wildly and in some cases dangerously misleading, according to a lawsuit.

Fitbit owners from several US states claim that despite the company's products purporting to accurately measure heart rates, Fitbits "do not and cannot consistently and accurately record wearers' heart rates during the intense physical activity for which Fitbit expressly markets them".One claimant in the class-action lawsuit says that while her personal trainer measured her heart rate at 160 beats per minute, her Fitbit Charge HR recorded a rate of 82 bpm. Another who said his doctor had told him not to exceed 160 bpm found that his Fitbit Surge device was as much as 25 bpm below what other trackers said.

 In response, Fitbit said that while its trackers provide better heart rate data than measures such as gym equipment, they are not intended to be scientific."We do not believe this case has merit. Fitbit stands behind our heart rate technology and strongly disagrees with the statements made in the complaint and plans to vigorously defend the lawsuit," the company said."Fitbit is committed to making the best clip and wrist-based activity trackers on the market. Our team has performed and continues to perform internal studies to validate our products’ performance.