Comparison of actigraphy with polysomnography and sleep logs in depressed insomniacs

Catherine Mccall, W. Vaughn Mccall

Research output: Contribution to journalArticlepeer-review

109 Scopus citations


Actigraphy is increasingly used in the assessment and treatment of various clinical conditions, being a convenient and cost-effective method of capturing bodily movements over long periods of time. This study examined the use of actigraphy in the measurement of sleep of patients with depression and insomnia. Fifty-four patients diagnosed with a current major depressive episode and chronic insomnia underwent a baseline overnight study with concurrent actigraphic and polysomnography (PSG) monitoring, as well as subjective sleep diaries. Agreement between PSG, actigraphy and sleep diary measurements was evaluated using two-tailed t-tests, Pearson's correlations and the Bland-Altman concordance technique. The only significant difference found between actigraphy and PSG was in latency to persistent sleep, in which actigraphy underestimated sleep latency relative to PSG (P<0.05). There were moderate positive correlations between actigraphy and PSG for all variables. In contrast, significant differences were observed between sleep diaries and PSG for all sleep variables. Bland-Altman concordance diagrams also demonstrated that, while bias was limited between PSG and the other two measurement types, there were somewhat broad 95% limits of agreement for all sleep variables with both sleep diaries and actigraphy. In summary, actigraphic measurements of sleep more closely approximated those of PSG than did sleep diaries in this sample of depressed insomniacs.

Original languageEnglish (US)
Pages (from-to)122-127
Number of pages6
JournalJournal of Sleep Research
Issue number1
StatePublished - Feb 2012
Externally publishedYes


  • Actigraphy
  • Depression
  • Insomnia
  • Polysomnography
  • Sleep logs

ASJC Scopus subject areas

  • Cognitive Neuroscience
  • Behavioral Neuroscience


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