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Title: Comparisons of Portable Sleep Monitors of Different Modalities: Potential as Naturalistic Sleep Recorders
Authors: Matsuo, Masahiro
Masuda, Fumi
Sumi, Yukiyoshi
Takahashi, Masahiro
Yamada, Naoto
Ohira, Masako Hasegawa
Fujiwara, Koichi  kyouindb  KAKEN_id  orcid (unconfirmed)
Kanemura, Takashi
Kadotani, Hiroshi
Author's alias: 藤原, 幸一
Keywords: portable sleep monitors
activity recorders
single channel EEG
sleep estimation
Issue Date: 15-Jul-2016
Publisher: Frontiers Media
Journal title: Frontiers in Neurology
Volume: 7
Thesis number: 110
Abstract: Background: Humans spend more than one-fourth of their life sleeping, and sleep quality has been significantly linked to health. However, the objective examination of ambulatory sleep quality remains a challenge, since sleep is a state of unconsciousness, which limits the reliability of self-reports. Therefore, a non-invasive, continuous, and objective method for the recording and analysis of naturalistic sleep is required. Objective: Portable sleep recording devices provide a suitable solution for the ambulatory analysis of sleep quality. In this study, the performance of two activity-based sleep monitors (Actiwatch and MTN-210) and a single-channel electroencephalography (EEG)-based sleep monitor (SleepScope) were compared in order to examine their reliability for the assessment of sleep quality. Methods: Twenty healthy adults were recruited for this study. First, data from daily activity recorded by Actiwatch and MTN-210 were compared to determine whether MTN-210, a more affordable device, could yield data similar to Actiwatch, the de facto standard. In addition, sleep detection ability was examined using data obtained by polysomnography as reference. One simple analysis included comparing the sleep/wake detection ability of Actiwatch, MTN-210, and SleepScope. Furthermore, the fidelity of sleep stage determination was examined using SleepScope in finer time resolution. Results: The results indicate that MTN-210 demonstrates an activity pattern comparable to that of Actiwatch, although their sensitivity preferences were not identical. Moreover, MTN-210 provides assessment of sleep duration comparable to that of the wrist-worn Actiwatch when MTN-210 was attached to the body. SleepScope featured superior overall sleep detection performance among the three methods tested. Furthermore, SleepScope was able to provide information regarding sleep architecture, although systemic bias was found. Conclusion: The present results suggest that single-channel EEG-based sleep monitors are the superior option for the examination of naturalistic sleep. The current results pave a possible future use for reliable portable sleep assessment methods in an ambulatory rather than a laboratory setting. Introduction
Rights: © 2016 Matsuo, Masuda, Sumi, Takahashi, Yamada, Ohira, Fujiwara, Kanemura and Kadotani. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
DOI(Published Version): 10.3389/fneur.2016.00110
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