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WHOOP, There It Is: Lessons From WHOOP’s FDA Warning Letter
The FDA objected to WHOOP’s user insights interface, claiming the color-coded (green/yellow/orange) readings imply medical interpretation, but most fitness wearables use similar color-coding schemes: for example, Garmin shows heart rate zones in green, yellow, and red, and Apple Watch displays activity rings with traffic-light logic.
If color-coding implies medical interpretation, are we going to start requiring submissions from manufacturers of street lights?
J Med Internet Res 2026;28:e90882
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The inclusion criteria for carers were as follows: (1) adults (aged ≥18 years) living in Scotland who self-identified as informal carers (eg, partners, children, or friends) of a person with dementia (self-reported), (2) contemplating or preparing to practice physical activity, (3) ability to carry out simple exercises such as arm raises or stretching, (3) ability to read and write in English, (4) access to a smartphone (Android or Apple) as well as access to the internet, and (5) normal or corrected-to-normal
J Med Internet Res 2025;27:e56739
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The 2023 survey results showed that Apple (210/475, 44%) was the most popular WAT brand, followed by Fitbit (101/475, 21%), Garmin (92/475, 19%), Samsung (47/475, 10%), and other brands (22/475, 5%).
J Med Internet Res 2025;27:e56251
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Convergence in Mobility Data Sets From Apple, Google, and Meta
Next, we performed a correlation analysis on the 3 data sets to depict their convergence or disparity (Figure 1 C; Figure 1 D, and Figure 1 E); we report positive correlations for Apple versus Meta (r=0.76), Apple versus Google (r=0.95), and Google versus Meta (r=0.87), when comparing the data.
The 2020 mobility patterns from Apple, Google, and Meta across 58 countries. We selected the 58 countries that were present in the data from Apple, Google, and Meta.
JMIR Public Health Surveill 2023;9:e44286
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Characteristics of Acute Childhood Illness Apps for Parents: Environmental Scan
Of mobile phone owners, more than 97% use an Android- or Apple-based operating system [27]. In 2017, nearly a third of the Canadian adults used m Health apps to monitor their health [28]. Importantly, increased use of health apps has been shown to have a significant correlation with improved health behaviors [29].
J Med Internet Res 2021;23(10):e29441
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This data is generated by counting the number of requests made to Apple Maps for directions in select countries/regions, sub-regions, and cities. For privcy protection, data that is sent from users’ devices to the Apple Maps service is associated with random, rotating identifiers; thus Apple claims to not have a profile of the movements and searches of individual users. Using trip information provided by Apple, we examined various associations and estimated the effective reproduction number R(t).
JMIR Public Health Surveill 2021;7(2):e20335
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