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Measuring steps with the Fitbit activity tracker

an inter-device reliability study

Measuring steps with the Fitbit activity tracker

an inter-device reliability study

Samenvatting

Activity trackers like Fitbit are used for self-tracking of physical activity by an increasing number of individuals. Comparing physical activity scores with peers can contribute to the desired behavioural change. However, for meaningful social comparison a high inter-device reliability is paramount. This study aimed to determine the inter-device reliability of Fitbit activity trackers in measuring steps. Ten activity trackers (Fitbit Ultra) were worn by a single person (male, 46 years) during eight consecutive days. Inter-device reliability was assessed on three different levels of aggregation (minutes, hours, days) with various methods, including intra-class correlation coefficient (ICC), Bland-Altman plots, limits of agreement (LOA) and Mixed Model Analysis. Results showed that the inter-device reliability of the Fitbit in measuring steps is good at all levels of aggregation (minutes, hours, days), but especially when steps were measured per day. This implies that individuals can reliably compare their daily physical activity scores with peers.

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OrganisatieHanzehogeschool Groningen
AfdelingQuantified Self Institute
LectoraatHealthy Ageing, Allied Health Care and Nursing
Gepubliceerd inJournal of medical engineering & technology Informa, Vol. 39, Uitgave: 5, Pagina's: 286-290
Datum2015-07-01
TypeArtikel
ISSN0309-1902
TaalEngels

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