Researchers have cast doubt upon the effectiveness of Fitbit's proprietary PurePulse technology to reliably gauge heart rate during periods of physical exertion.
According to newly released findings underwritten by the legal team currently seeking damages from tech giant Fitbit through class action lawsuit, the popular exercise accessory regularly miscalculated its wearer's heart rate by an average of around 19 beats per minute.
The California State Polytechnic University at Pomona study asked 43 participants to carry out an hour's worth of vigorous tasks analogous to actions portrayed within Fitbit marketing materials. While jumping rope or jogging in place, each participant wore a Fitbit, an electrocardiogram sensor, and a medical-grade Zephyr BioHarness.
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