Measuring Sleep by Wrist Actigraph.
Abstract
Using a piezo-electric transducer, wrist activity was recorded simultaneously with EEG, EOG, and EMG to obtain 102 recordings -- 39 from hospital patients and 63 from non-patients -- during both Sleep and Wakefulness. On a minute-to-minute basis, wrist activity alone was used to estimate Sleep Time. Blind independent scoring of the EEG-EOG-EMG records was also done for Sleep and Wakefulness. Results from the two Sleep/Wake estimations agreed 94.5% of the minutes. Correlations between the two methods were determined for Total Sleep Period (r=0.90), Total Sleep Time (r=0.89), Total Wake Within Sleep (r=0.70), and number of Mid-Sleep Awakenings (r=0.25). Correlation coefficients were even higher when the 39 patients were excluded from the computations. On the average, the actigraphic method overestimated Sleep Time by 10 minutes. Continuous wrist activity recordings provide simple, inexpensive, but very accurate estimates of Sleep Time. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1979
- Accession Number
- ADA103322
Entities
People
- Daniel F. Kripke
- Daniel J. Mullaney
- Sam Messin
Organizations
- University of California, San Diego