A Harvard researcher rethought plans for Apple Watch devices after finding inconsistencies in the heart rate variability data collected by those devices. As it turned out, data for the same period of time may change without warning, since Apple, at its discretion, changes the algorithms of the device.
Finnish statistician Jukka-Pekka Onnela, assistant professor of biostatistics at Harvard School of Public Health and developer of the open source data platform Beiwe, does not typically use consumer wearables in his research. His team primarily relies on research-grade devices designed to collect data for scientific research. However, through collaboration with some medical institutions, Onnela became interested in commercially available products. Realizing that problems with these devices are possible, scientists decided to test how serious these problems are before starting work.
Checking the heart rate data showed that the data for the same time periods, imported twice, was different. The experiment used data collected from the beginning of December 2018 to September 2020. The first time the data was imported on September 5, 2020, the second time on April 15, 2021.
Since these datasets included data from the same time period, in theory they should be identical. Onnela says he expected some differences because instead of the “raw” data collected by the device, data that is filtered and processed internally is usually imported.
Companies change their algorithms regularly and without warning, so September 2020 exports could include data analyzed using one algorithm, and April 2021 exports using another.
“What was amazing is how different they are,” says Onnela. “This is probably the purest example of this phenomenon that I have ever seen.”
In some situations, even such data can be useful, as it will continue to reflect information about heart rate variability.
Olivia Walch of the University of Michigan, a sleep researcher, summed up the commercial wearable situation: “If you’re interested in the big picture, you can call yourself to keep using the device.”
“But if the specific heart rate variability calculated on a daily basis is relevant to the study, then relying on the Apple Watch can be dangerous,” Wolch added.
The screen of Xiaomi Mi Band 7 turned out to be larger than expected, but the battery capacity is less. Fitness bracelet in a retail box lit up in live photos
Not a day goes by without leaks about the latest Xiaomi Mi Band 7 fitness bracelet. This time, the device was photographed in a retail box, on the back of which is a list of main features. Below is the capacity of the battery.
Bold expectations that the Mi Band 7 will receive a 250 mAh battery have been dashed against the harsh reality – the fitness bracelet uses a 180 mAh battery. At least in the version with NFC, but it is unlikely that the battery capacity of the regular Mi Band 7 will be larger. However, even 180 mAh is noticeably more than 125 mAh in Mi Band 6. At the same time, we recall that the AMOLED screen size was 1.62 inches, while rumors attributed to the device a display with a diagonal of 1.56 inches. Xiaomi calls the screen of the Mi Band 7 a “Retina level display”.
What else do the inscriptions on the fitness bracelet box say? For example, the presence of a pulse oximeter and a proprietary voice assistant, support for more than 100 training modes, a sleep monitoring system and water protection (5ATM). The cost of the version with NFC is already known – $ 40. The official premiere of Mi Band 7 will take place on May 24.
Amazfit GTR 2 New Version smartwatch unveiled with calls, music storage and always-on AMOLED screen
Huami’s Amazfit brand has unveiled a new smartwatch called the Amazfit GTR 2 New Version, which will go on sale on May 23rd. They got an always-on screen and Bluetooth calls.
The Amazfit GTR 2 New Version shares a similar design with the GTR 2. The model retains the aluminum alloy body but is available with a silicone strap in Lightning Gray and Thunder Black.
Amazfit GTR 2 New Version is equipped with a 1.39-inch AMOLED screen with a resolution of 454 x 454 pixels, a brightness of up to 450 cd / m2 and a density of 326 pixels per inch. The display is covered with 2.5D glass with a scratch-resistant carbon coating.
The smartwatch supports over 90 sports modes, including outdoor running, walking, indoor cycling, open water swimming, elliptical trainer, pool swimming, climbing, trail running, treadmill, skiing, free workouts and outdoor cycling. The watch also comes with activity tracking features such as heart rate, distance, steps, calories, sleep and stress.
Other built-in features include Huami’s own biotracker, blood oxygen saturation (SpO2) measurement, biological data sensor, accelerometer, gyroscope sensor, geomagnetic sensor, air pressure sensor, and ambient light sensor. The watch is waterproof (50 ATM) and supports Bluetooth 5.0 LE, Wi-Fi (2.4 GHz) and GPS + GLONASS. The watch has 3 GB of space for offline music playback.
The 471 mAh battery provides up to 14 days of battery life with normal use. With heavy use, the battery can last for 6.5 days, and battery life extends to 38 days with normal use.
The price of new items is 155 dollars.
Xiaomi showed Mi Band 7 in new images. Lots of new themes and a 1.62-inch AMOLED screen in all its glory
Xiaomi continues to publish teasers dedicated to the Mi Band 7 fitness bracelet. Recall that the official premiere of the new product will take place very soon – on May 24th.
The first image confirms the presence of a 1.62-inch AMOLED screen, although earlier we talked about using a smaller 1.56-inch display in the device. This picture was posted on Weibo by the head of Xiaomi, Lei Jun, and in the accompanying text, he noted that the bracelet supports heart rate and SpO2 monitoring, various exercise modes, weather forecast display, etc. But not a word about the presence of a built-in GPS module, although rumors speak of its presence.
The second picture demonstrates not only the color variety of branded straps, but also the variability of the main screen themes. And, of course, not all topics are represented in the picture. Xiaomi Mi Band 7 will go on sale in two versions – with and without NFC. The NFC version has already been spotted in China for $40.
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