STUDY OBJECTIVES: To evaluate the reliability and validity of the commercially available Fitbit accelerometer compared to polysomnography (PSG) and two different actigraphs in a pediatric sample. DESIGN AND SETTING: All subjects wore the Fitbit while undergoing overnight clinical polysomnography in a sleep laboratory; a randomly selected subset of @entity1 also wore either the Ambulatory Monitoring Inc. Motionlogger Sleep Watch (AMI) or Phillips-Respironics Mini-Mitter Spectrum (PRMM). @entity1 : 63 youth (32 females, 31 males), ages 3-17 years (mean 9.7 years, SD 4.6 years). MEASUREMENTS: Both "Normal" and "Sensitive" sleep-recording Fitbit modes were examined. Outcome variables included @entity25 ( @entity25 ), wake after sleep onset (WASO), and @entity25 ( @entity25 ). Primary analyses examined the differences between Fitbit and PSG using repeated-measures ANCOVA, with epoch-by-epoch comparisons between Fitbit and PSG used to determine sensitivity, specificity, and accuracy. Intra-device reliability, differences between Fitbit and actigraphy, and differences by both developmental age group and @entity387 ( @entity387 ) status were also examined. RESULTS: Compared to PSG, the Normal Fitbit mode demonstrated good sensitivity (0.86) and accuracy (0.84), but poor specificity (0.52); conversely, the Sensitive Fitbit mode demonstrated adequate specificity (0.79), but inadequate sensitivity (0.70) and accuracy (0.71). Compared to PSG, the Fitbit significantly overestimated @entity25 (41 min) and @entity25 (8%) in Normal mode, and underestimated @entity25 (105 min) and @entity25 (21%) in Sensitive mode. Similar differences were found between Fitbit (both modes) and both brands of actigraphs. CONCLUSIONS: Despite its low cost and ease of use for consumers, neither sleep-recording mode of the Fitbit accelerometer provided clinically comparable results to PSG. Further, pediatric @entity25 and clinicians should be cautious about substituting these devices for validated actigraphs, with a significant risk of either overestimating or underestimating outcome data including @entity25 and @entity25 .

Comparison of a Commercial Accelerometer with Polysomnography and Actigraphy in XXXX and Adolescents.

@entity1 :: ('9606', 'Species') :: ['participants', 'PARTICIPANTS'] @entity25 :: ('MESH:D012893', 'Disease') :: ['TST', 'sleep efficiency', 'SE', 'sleep researchers', 'total sleep time'] @entity387 :: ('MESH:D012891', 'Disease') :: ['sleep disordered breathing', 'SDB']
@entity1 :: (9606,Species) :: ['Children']
