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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

This study involved a secondary analysis of anonymized data collected via Withings activity trackers. The dataset was fully anonymized at the source, and no identifiable information was accessible to the research team. The study received approval from the internal ethics committee of Institut Curie (approval number DATA210201). During registration for the Withings Health Mate app, all users give consent to the anonymous use of their data for research purposes.

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

Importance of Getting Enough Sleep and Daily Activity Data to Assess Variability: Longitudinal Observational Study

Importance of Getting Enough Sleep and Daily Activity Data to Assess Variability: Longitudinal Observational Study

At a second home visit, the participants were equipped with the wearable Withings Steel HR smartwatch (Withings Inc), tracking the number of steps and heart rate on a per-minute basis. Participants were also equipped with the nearable Withings Aura sleep mattress (Withings Inc), tracking the various phases of sleep (sleep onset latency, wake, light sleep, deep sleep, rapid eye movement [REM] sleep, and waking up times) on a per-minute basis [34].

María Óskarsdóttir, Anna Sigridur Islind, Elias August, Erna Sif Arnardóttir, François Patou, Anja M Maier

JMIR Form Res 2022;6(2):e31807

Associations of Physical Activity Level and Variability With 6-Month Weight Change Among 26,935 Users of Connected Devices: Observational Real-Life Study

Associations of Physical Activity Level and Variability With 6-Month Weight Change Among 26,935 Users of Connected Devices: Observational Real-Life Study

The population was initially composed of a sample of 35,841 highly connected Withings customers, those who had purchased at least three Withings-connected devices: a pulse activity tracker [23,24], a body weighing scale [25], and a BP-800 blood pressure monitor [26] (Withings SA). Customer data, including sex, age, number of steps per day, body weight, heart rate, and blood pressure, were provided by Withings and were collected between October 2009 and April 2016.

Douae El Fatouhi, Lidia Delrieu, Catherine Goetzinger, Laurent Malisoux, Aurélie Affret, David Campo, Guy Fagherazzi

JMIR Mhealth Uhealth 2021;9(4):e25385

An International Study on the Determinants of Poor Sleep Amongst 15,000 Users of Connected Devices

An International Study on the Determinants of Poor Sleep Amongst 15,000 Users of Connected Devices

Therefore, based on data from an international sample of sleep information from more than 15,000 customers of the consumer electronics company Withings (now Nokia), we have evaluated several determinants of poor total and deep sleep quantity and determined a ratio of deep/total sleep duration that indicates poor sleep.

Guy Fagherazzi, Douae El Fatouhi, Alice Bellicha, Amin El Gareh, Aurélie Affret, Courtney Dow, Lidia Delrieu, Matthieu Vegreville, Alexis Normand, Jean-Michel Oppert, Gianluca Severi

J Med Internet Res 2017;19(10):e363