![]() However, he adds, “No two wearables estimate the same behavior (like sleep and step count) the same, and so users might be disappointed that fancy derived composite scores are only the company’s ‘black box’ and generally unvalidated algorithm.” Will This Apple Watch Update Be Different?ĭr. “I think they are useful for general wellness and in some cases to identify risk for serious sleep disorders and sleep-related poor health, like heart disease heart rate variability,” he says. Azizi Seixas, director of the Media and Innovation Lab at University of Miami, says he uses several types of tracking devices himself. So these new tools give us a window into our sleep health, since healthy sleep means more REM and deep sleep.” He adds, “Our new app actually allows users to swipe between different sleep detection algorithms (I.e our own, Apple, or another device).”ĭr. Deep sleep and REM are defined by certain types of brainwaves and physiological states and these devices can estimate these states with about 80% accuracy. From motion and heart rate data combined we can develop algorithms that get close to what an electrode sensor would detect when it comes to our brainwaves. Dan Gartenberg, a sleep scientist and the CEO of SleepSpace, which offers both a sleep-tracking app and a “ Smart Bed Platform ,” explains, “Devices like Apple Watch, Oura, and Fitbit use something called Photoplethysmography ( PPG) to measure your heart rate. There are a bunch of externally developed apps you can download to try and get data on your sleep cycles, and they all have their own ways to collect and quantify data with varying degrees of success and accuracy.ĭr. According to a press release from Apple, “Using signals from the accelerometer and heart rate sensor, Apple Watch can detect when users are in REM, Core, or Deep sleep.”Ĭurrently, your Apple Watch can kind of guess how much you’ve slept if you turn on “Sleep Focus,” based on how much you move around while you sleep. Buried in this deluge of data was news about an update to the Apple Watch’s operating system that will track the wearer’s sleep in a more granular way. At this year’s Apple Worldwide Developers Conference, CEO Tim Cook and other bigwigs unveiled all sorts of new tech goodies, from redesigned laptops to the next generation of operating systems for its computers, tablets, and smartphones. ![]()
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