![]() ![]() Translation: There’s only about a 50-percent chance your data is accurate. ![]() But “in terms of tracking light, deep, and REM sleep, basically all of the devices performed at only a medium level of accuracy,” says Chinoy. Most new wearables also track the sleep stages you cycle through throughout the night. They also tended to perform worse on nights with poorer or disrupted sleep, meaning your data in the morning may say you had a good night’s sleep, even if you were tossing and turning throughout, says Chinoy. The study authors hypothesized that Garmins’ relatively higher threshold for wake and lower threshold for sleep is what resulted in their poor performance. In general, the devices tended to overestimate sleep and underestimate wake. More Sleep Could Make You Less Injury-Prone. ![]() That’s likely because, if you’re not moving and your heart rate is low, the devices-which typically use an accelerometer to detect movement and a light-based sensor to detect heart rate-have a harder time determining whether you’re actually awake or asleep. “However, if you’re in bed trying to sleep but still awake, they’ll only perform at a medium level of accuracy.” What that really means is “if you’re asleep, most these devices are going to correctly determine-with 90 to 95 percent accuracy-that you are indeed asleep,” says the Sleep study author Evan Chinoy, a sleep research scientist at the Naval Health Research Center in San Diego, CA. The Apple Watch Series 3 and Garmin Vivosmart 4 fell at the other end of the spectrum. Play icon The triangle icon that indicates to playĪdditional research published in the Nature & Science of Sleep Journal in October 2020 found that the Fitbit Ionic and the Oura Smart Ring possessed the lowest degrees of error in sleep tracking compared to an electroencephalography (EEG)-based device as well as other wrist-based trackers, including the Beddit Sleep Monitor 3.0, Fatigue Science Readiband, Polar A370, and WHOOP Strap 2.0. ![]()
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