Accuracy of PurePulse photoplethysmography technology of Fitbit Charge 2 for assessment of heart rate during sleep

@article{Haghayegh2019AccuracyOP,
  title={Accuracy of PurePulse photoplethysmography technology of Fitbit Charge 2 for assessment of heart rate during sleep},
  author={Shahab Haghayegh and Sepideh Khoshnevis and Michael H. Smolensky and Kenneth R. Diller},
  journal={Chronobiology International},
  year={2019},
  volume={36},
  pages={927 - 933}
}
ABSTRACT Elevated asleep heart rate (HR) is a risk factor for cardiovascular disease and other-cause morbidity and mortality. We assessed the accuracy of Fitbit Inc. PurePulse® photoplethysmography with reference to three-lead electrocardiography (ECG) in determining HR during sleep. HR of 35 (17 female) healthy adults 25.1 ± 10.6 years of age (mean ± SD) was continuously recorded throughout a single night of sleep. There was no significant difference in asleep HR mean (0.09 beats per minute… 
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