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Wrist actigraphic measures of sleep in spaceSTUDY OBJECTIVES: To determine whether wrist actigraphy is useful as a tool for space-based sleep research. Specifically, to determine whether bedtimes and waketimes can be identified from the actigraphic record, and whether actigraphic measures of sleep in space are related to polysomnographic (PSG) ones. DESIGN AND SETTING: Actigraphy, sleep diary, and Polysomnographic (PSG) measures of sleep were obtained from four subjects in two 72h measurement blocks occurring 2d and 12d into a 17d Space Shuttle mission in orbiting the earth in microgravity. PATIENTS: Four healthy male astronauts aged 38y - 47y. INTERVENTIONS: NA. MEASUREMENTS AND RESULTS: Sleep onset and offset at "night" could be quite clearly identified from the actigraphic record and were better estimated by actigraph than by diary. There was a high correlation between actigraphic and PSG estimates of sleep duration (r = 0.96) and sleep efficiency (r = 0.88), and a similarity in the mean estimates obtained. On a minute-by-minute basis, there was a good correlation between sleep stage and actigraphic movement counts, with a higher level of counts per minute recorded in epochs with lighter PSG sleep stages. There was also a high correlation (r = 0.90) between minutes of stage 0 (wake) occurring between bedtime and wake time, and number of non-zero actigraph epochs during the same interval. CONCLUSIONS: Actigraphy worked well in space both as a way of detecting bedtimes and waketimes, and as an indicant of sleep restlessness.
Document ID
20040141770
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Monk, T. H.
(University of Pittsburgh Medical Center, Western Psychiatric Institute and Clinic PA 15213, United States)
Buysse, D. J.
Rose, L. R.
Date Acquired
August 22, 2013
Publication Date
November 1, 1999
Publication Information
Publication: Sleep
Volume: 22
Issue: 7
ISSN: 0161-8105
Subject Category
Aerospace Medicine
Funding Number(s)
CONTRACT_GRANT: AG 15136
CONTRACT_GRANT: AG 13396
CONTRACT_GRANT: MH 01235
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Regulatory Physiology
NASA Program Biomedical Research and Countermeasures
manned
Non-NASA Center
Flight Experiment
NASA Experiment Number 8913048
short duration
STS-78 Shuttle Project

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