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  • Title: How well does a commercially available wearable device measure sleep in young athletes?
    Author: Sargent C, Lastella M, Romyn G, Versey N, Miller DJ, Roach GD.
    Journal: Chronobiol Int; 2018 Jun; 35(6):754-758. PubMed ID: 29750580.
    Abstract:
    The validity of a commercially available wearable device for measuring total sleep time was examined in a sample of well-trained young athletes during night-time sleep periods and daytime naps. Participants wore a FitBit HR Charge on their non-dominant wrist and had electrodes attached to their face and scalp to enable polysomnographic recordings of sleep in the laboratory. The FitBit automatically detected 24/30 night-time sleep periods but only 6/20 daytime naps. Compared with polysomnography, the FitBit overestimated total sleep time by an average of 52 ± 152 min for night-time sleep periods, and by 4 ± 8 min for daytime naps. It is important for athletes and practitioners to be aware of the limitations of wearable devices that automatically detect sleep duration.
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