Detection of Flares by Decrease in Physical Activity, Collected Using Wearable Activity Trackers in Rheumatoid Arthritis or Axial Spondyloarthritis: An Application of Machine Learning Analyses in Rheumatology.

Objective: Flares in rheumatoid arthritis (RA) and axial spondyloarthritis (SpA) may influence physical activity. The aim of this study was to assess longitudinally the association between patient-reported flares and activity-tracker-provided steps per minute, using machine learning.

Methods: This prospective observational study (ActConnect) included patients with definite RA or axial SpA.

[Regular bike use in Nantes: a combined health and mobility approach].

The health benefits of regular physical activity have now been clearly established. Two initiatives developed in Nantes allowed estimation of the benefits as perceived by local authorities as well as the motivations of cyclists and the general population. The City Council and the metropolitan area of Greater Nantes used the HEAT tool, which identifies the economic health benefit of increasing active forms of transport at the population level.