Comparison of Actigraphic Performance between $ActiWatch^{(R)}$ and $SleepWatch^{(R)}$：Focused on Sleep Parameters Utilizing Nocturnal Polysomnography as the Standard
활동기록기($ActiWatch^{(R)}$와 $SleepWatch^{(R)}$) 성능 비교 연구：야간수면다원기록을 표준으로 한 수면변인을 중심으로
Shin, Hong-Beom;Lee, Ju-Young;Lee, Yu-Jin;Kim, Kwang-Jin;Lee, Eun-Young;Han, Jong-Hee;Im, Mee-Hyang;Jeong, Do-Un;
Department of Neuropsychiatry, Eulji University College of Medicine, Department of Neuropsychiatry, Eulji Medical Center;Division of Sleep Studies and Department of Neuropsychiatry Seoul National University Hospital;Department of Psychiatry, Eunpyung Metropolitan Hospital;Division of Sleep Studies and Department of Neuropsychiatry Seoul National University Hospital;Division of Sleep Studies and Department of Neuropsychiatry Seoul National University Hospital;Department of Biomedical Engineering, Seoul National University College of Medicine;Department of Psychiatry and Behavioral Science, Seoul National University College of Medicine;Division of Sleep Studies and Department of Neuropsychiatry Seoul National University Hospital;
Objectives: We attempted to compare the performance of 2 commercially available actigraphies with focus on sleep parameters, using polysomnography as standard comparison tool. Methods: Fourteen normal volunteers (5 males and 9 females, mean age of $28{pm}4.6;years$) participated in this study. All the participants went through one night of polysomnography, simultaneously wearing 2 different kinds of actigraphies on each wrist. Polysomnographic and actigraphic data were stored, downloaded, and processed according to standard protocols and then statistically compared. Results: Both $ActiWatch^{(R)}$ and $SleepWatch^{(R)}$ tended to overestimate the total sleep time, compared to the polysomnography. $SleepWatch^{(R)}$ tended to underestimate the sleep latency. The two actigraphs and the polysomnograph did not show significant difference of sleep efficiency, when compared with one another. In addition, all of the sleep parameters from the instruments showed linear correlations except in $SleepWatch^{(R)}''s$ sleep latency. The sleep parameters from the two actigraphs did not show much noteworthy difference, and linear relationships were found between the sleep parameters from the two actigraphs. There was no significant distinction in the results of the two different actigraphs. Conclusion: The results of two actigraphies can be used interchangeably since the sleep parameters of the two different actigraphies do not show significant differences statistically. Overall, it is not legitimate to use actigraphy as a substitute for polysomnography. However, since sleep parameters except sleep latency show linear correlations, actigraphy might possibly be used to follow up patients after polysomnography.
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