What question did this study set out to answer?

To evaluate the use of Fitbit as an activity monitor in patients with idiopathic inflammatory myopathy (IIM).

February 27, 2026Open Access

Fitbit as an activity monitor in idiopathic inflammatory myopathy: results from a real-world cohort

Puntos clave

To evaluate the use of Fitbit as an activity monitor in patients with idiopathic inflammatory myopathy (IIM).
Assessed compliance with Fitbit PAM variables in a large cohort of IIM patients.
Evaluated psychometric properties including test-retest reliability and validity of the Fitbit measurements.
Compared Fitbit data with traditional measures of patient performance and disease activity.
Fitbit PAM variables showed strong test-retest reliability with high validity.
Patients demonstrated favorable compliance with the use of Fitbit for self-monitoring.
Fitbit metrics can effectively track aspects of quality of life and disease activity.

Resumen

In a large IIM cohort, Fitbit® PAM variables demonstrate favourable compliance and psychometric properties with strong test-retest reliability and validity. PAMs can complement current measurements to remotely track patient performance, quality of life, and disease activity.

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