Lee, Paul H. (2018) Validation study of accelerometer in measuring some sleep parameters in adults—reply. Sleep and Breathing, 22 (2), [539]. (doi:10.1007/s11325-017-1552-z).
Abstract
Invited Letter to the Editor: Dr. Kawada raised three concerns about our study. First, the validity of the reference accelerometer, Actiwatch 2, was questioned, as there existed only validation study in children and adolescents (against polysomnography). Second, there are a number of thresholds for classifying sleep and awake epochs and they perform differently in measuring different sleep parameters. Third, subjects with insomnia may have little motion during wakefulness and these wakefulness time might be misclassified as sleep by accelerometers
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