Article Dans Une Revue European Review of Aging and Physical Activity Année : 2024

Reliable measures of rest-activity rhythm fragmentation: how many days are needed?

Mesures fiables de la fragmentation du rythme de repos et activité : combien de jours faut-il mesurer ?

Résumé

Background: A more fragmented, less stable rest-activity rhythm (RAR) is emerging as a risk factor for health. Accelerometer devices are increasingly used to measure RAR fragmentation using metrics such as inter-daily stability (IS), intradaily variability (IV), transition probabilities (TP), self-similarity parameter (alpha), and activity balance index (ABI). These metrics were proposed in the context of long period of wear but, in real life, non-wear might introduce measurement bias. This study aims to determine the minimum number of valid days to obtain reliable fragmentation metrics. Methods: Wrist-worn accelerometer data were drawn from the Whitehall accelerometer sub-study (age: 60 to 83 years) to simulate different non-wear patterns. Pseudo-simulated data with different numbers of valid days (one to seven), defined as < 1/3 of non-wear during both day and night periods, and with omission or imputation of non-wear periods were compared against complete data using intraclass correlation coefficient (ICC) and mean absolute percent error (MAPE). Results: Five days with valid data (97.8% of participants) and omission of non-wear periods allowed an ICC ≥ 0.75 and MAPE ≤ 15%, acceptable cut points for reliability, for IS and ABI; this number was lower for TPs (two-three days), α and IV (four days). Overall, imputation of data did not provide better estimates. Findings were consistent across age and sex groups. Conclusions: The number of days of wrist accelerometer data with at least 2/3 of wear time for both day and night periods varies from two (TPs) to five (IS, ABI) days for reliable RAR measures among older adults.

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hal-04833401 , version 1 (12-12-2024)

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Ian Meneghel Danilevicz, Sam Vidil, Benjamin Landré, Aline Dugravot, Vincent Theodor van Hees, et al.. Reliable measures of rest-activity rhythm fragmentation: how many days are needed?. European Review of Aging and Physical Activity, In press, 21 (1), pp.29. ⟨10.1186/s11556-024-00364-5⟩. ⟨hal-04833401⟩
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