FeaturesHow it WorksBlogFAQGet StartedFeaturesHow it WorksBlogFAQGet StartedFact Checked|Last Updated:February 8, 2024Dr. Erik KoremAlex BrownellChris MorrisWearable devices have as much as 20% error when measuring heart rate, and caloric expenditure measurements can be off by as much as 100%. Most wearable fitness devices overestimate total sleep time and underestimate wakefulness after sleep onset.Key Takeaways:44% of people use wearable fitness devices to measure heart rate.42% of people use wearable fitness devices to measure caloric expenditure (calories burned).On average, wearable fitness devices have a slight tendency to underestimate heart rate.On average, there is a tendency for wearable fitness devices to underestimate caloric expenditure. Exercise intensity, motion of extremities during exercise, wrist position, interference between skin and sensors (sweat or dirt on the skin), and skin pigmentation have been shown to decrease the accuracy of wearable devices. 60% of people...
