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Changes in Physical Activity, Heart Rate, and Sleep Measured by Activity Trackers During the COVID-19 Pandemic Across 34 Countries: Retrospective Analysis

Changes in Physical Activity, Heart Rate, and Sleep Measured by Activity Trackers During the COVID-19 Pandemic Across 34 Countries: Retrospective Analysis

The color scale in Figure 2 represents the median number of daily steps, ranging from red (fewer steps) to green (more steps), highlighting variations in physical activity levels across countries and over time. Countries with darker green shades indicate higher levels of physical activity, while darker red shades reflect lower activity levels. In Figure 3, changes in the median number of steps taken are displayed across four categories of countries, distinguished by the size of the user base.

Bastien Wyatt, Nicolas Forstmann, Nolwenn Badier, Anne-Sophie Hamy, Quentin De Larochelambert, Juliana Antero, Arthur Danino, Vincent Vercamer, Paul De Villele, Benjamin Vittrant, Thomas Lanz, Fabien Reyal, Jean-François Toussaint, Lidia Delrieu

J Med Internet Res 2025;27:e68199