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Letter to the Editor| Volume 312, ISSUE 1-2, P194, January 15, 2012

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The handling of absolute values of activity counts by actigraphy

Published:August 24, 2011DOI:https://doi.org/10.1016/j.jns.2011.08.005
      I read with great interest the usefulness of actigraphy for parkinsonian signs [
      • Uemura Y.
      • Wada-Isoe K.
      • Nakashita S.
      • Nakashima K.
      Mild parkinsonian signs in a community-dwelling elderly population sample in Japan.
      ]. In clinical and epidemiological studies of sleep, actigraphy has been used frequently to judge the sleep/awake state of the subjects [
      • Sadeh A.
      Activity-based measures of sleep.
      ]. I have used actigraphy [
      • Kawada T.
      Monitoring of activity by wrist accelerometer in patients with atopic dermatitis.
      ,
      • Kawada T.
      Agreement rates for sleep/wake judgments obtained via accelerometer and sleep diary: a comparison.
      ], but have seldom engaged in direct usage of actigraphic activity counts, as presented by Uemura et al.
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      References

        • Uemura Y.
        • Wada-Isoe K.
        • Nakashita S.
        • Nakashima K.
        Mild parkinsonian signs in a community-dwelling elderly population sample in Japan.
        J Neurol Sci. 2011; 304: 61-66
        • Sadeh A.
        Activity-based measures of sleep.
        in: Carskadon M.A. Encyclopedia of sleep and dreaming. Macmillan, New York1995: 4-6
        • Kawada T.
        Monitoring of activity by wrist accelerometer in patients with atopic dermatitis.
        Clin Exp Dermatol. 2010; 35: 193-194
        • Kawada T.
        Agreement rates for sleep/wake judgments obtained via accelerometer and sleep diary: a comparison.
        Behav Res Methods. 2008; 40: 1026-1029
        • Morgenthaler T.
        • Alessi C.
        • Friedman L.
        • Owens J.
        • Kapur V.
        • Boehlecke B.
        • et al.
        Practice parameters for the use of actigraphy in the assessment of sleep and sleep disorders: an update for 2007.
        Sleep. 2007; 30: 519-529
        • Kanady J.C.
        • Drummond S.P.
        • Mednick S.C.
        Actigraphic assessment of a polysomnographic-recorded nap: a validation study.
        J Sleep Res. 2011; 20: 214-222
        • Spruyt K.
        • Gozal D.
        • Dayyat E.
        • Roman A.
        • Molfese D.L.
        Sleep assessments in healthy school-aged children using actigraphy: concordance with polysomnography.
        J Sleep Res. 2011; 20: 223-232
      1. http://www.camntech.com/files/The_Actiwatch_User_Manual_V7.2.pdf p60.