SLEEP TIME MONITORING BY ACCELEROMETER IN TWO SUBJECTS FOR 1 YEAR
✍ Scribed by T. KAWADA; M. KUROIWA; Y. SASAZAWA; S. SUZUKI; Y. TAMURA
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 146 KB
- Volume
- 250
- Category
- Article
- ISSN
- 0022-460X
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✦ Synopsis
The authors conducted sleep time monitoring using an activity-detecting device on a married couple. The subjects were a 39-year-old man and a 36-year-old woman. They were continuously monitored for 1 year or a half-year from 1998 to 1999. Their daily activities were not limited. The male works in an o$ce 5 days a week and stays at home on weekends. The female is a farmer and works in the "eld when the weather is clear. They usually went to bed at 10}11 p.m. and got up around 6 a.m. the next morning on weekdays. The activity-monitoring device, Actiwatch , was installed on the wrists of their non-dominant arms. The number of body movements was calculated by the summation of the active electricity number. There was no signi"cant monthly di!erence in the mean nightly total sleep time (TST) by analysis of variance in either the husband or the wife. When nocturnal and diurnal sleep were combined for the analysis, the mean value in April or May, 1999, was signi"cantly larger than the values in July, August, December or October, although only in the husband. The sleep time for Saturday or Sunday was signi"cantly extended as compared to that of a weekday. Power spectrum analysis showed the TST cycle to predominate on all 7 days in the week in both subjects.
2002 Academic Press