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. 2022 Jun;74(3):259-263.
doi: 10.23736/S2724-5276.18.05333-1. Epub 2018 Nov 7.

Comparison of the Fitbit® charge and polysomnography for measuring sleep quality in children with sleep disordered breathing

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Comparison of the Fitbit® charge and polysomnography for measuring sleep quality in children with sleep disordered breathing

Mohammed Hakim et al. Minerva Pediatr (Torino). 2022 Jun.

Abstract

Background: Due to the cost and inconvenience of polysomnography (PSG), wrist-worn accelerometers have been explored as an alternative method to measure sleep efficacy in children with obstructive sleep apnea (OSA) or sleep-disordered breathing (SDB). We compared the measurement of sleep quality with the Fitbit® charge (Fitbit Inc., San Francisco, CA, USA) compared to PSG in children presenting for sleep studies.

Methods: Children ages 3 to 18 years presenting for PSG with persistent SDB symptoms were enrolled. During PSG, the Fitbit® charge (Fitbit Inc.) was placed on the wrist and time-synchronized with sleep laboratory devices, which were worn while a single-night PSG was performed. Bias and concordance in measurements of total sleep time (TST), total wake time (TWT), and number of awakenings were assessed using paired t-tests, sign-rank tests, and Lin's concordance coefficient.

Results: The study cohort included 22 patients (9 boys and 13 girls; 9±3 years). TST was significantly overestimated using the Fitbit® charge (Fitbit Inc.) (difference in means: 30 min; 95% confidence interval [CI] of difference: 3-58; P=0.031), while TWT was underestimated (difference: 23 min; 95% CI: 4-42; P=0.018). All measures showed a lack of concordance between the Fitbit® charge (Fitbit Inc.) and PSG.

Conclusions: The current prospective study confirms that the Fitbit® charge (Fitbit Inc.) overestimates time spent asleep compared to PSG in children with OSA/SDB symptoms, limiting the validity of sleep monitoring with wearable activity trackers appears in these patients.

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