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KMID : 0350819990130020137
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Seoul Journal of Nursing
1999 Volume.13 No. 2 p.137 ~ p.148
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A study on Circadian rhythm of Healthy and Demented elderly
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김신미/Kim, Shin Mi
송미순/오진주/김춘미/Song, Mi Soon/Oh, Jin Joo/Kim, Choon Mi
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Abstract
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Circadian rhythm changes in healthy and demented elderly has been recognized as a major health factor and is believed to be related to high prevalence of sleep disorders and other health issues such as hospitalization in these populations. In addition, behavioral disturbance occurs simultaneously with sleep impairment in demented elderly. The pattern of circadian rhythm changes of healthy elderly is phase advance, shortened duration, decreased amplitude. The pattern of circadian rhythm changes of demented elderly is known to be not congruent with large interpersonal and intrapersonal variance.
Despite of the importance of circadian rhythm changes of healthy and demented elderly, circadian rhythm study in Korea is rare. Therefore, the purpose of this study is to identify and to compare the pattern of circadian rhythm of healthy and demented elderly. For this purpose, tympanic temperature and sleep-activity rhythm were evaluated as indicators of circadian rhythm. The results are as follows:
1. Temperature
1) Mean Temperature of healthy and demented elderly was 36.36°C ± 0 .50°C and 36.77°C ± 1.88°C.
2) Temperature Peak of healthy and demented elderly was 36.86°C ± 0.42°C and 36.78°C ± 0.43°C.
3) Temperature Nadir of healthy and demented elderly was 35.88°C ± 0.72°C and 35.64°C ± 0.62°C.
4) Amplitude of healthy and demented elderly was 0.98°C ± 0.55°C and 1.15°C ± 0.65°C.
5) Number of occurrence of nadir at 4 AM of healthy and demented elderly was 58.3% and 85.7% Number of occurrence of peak at 4 PM of healthy and demented elderly was 75.0% and 78.6%.
6) There was no significant difference statistically between two groups in all variables.
2. Sleep-activity
1) Sleep time at night of healthy and demented elderly was 10: 05 (hour: min) and 8: 47 (hour:
min). There was statistically significant (p < 0.01) difference between two groups and sleep time at night was advanced in the demented group.
2) Wake up time in the morning of healthy and demented elderly was 5: 14 (hour: min) and 4: 17 (hour: min). There was no significant difference statistically between two groups however wake up time in the morning was a little advanced in the demented group.
3) Frequency of waking up after sleep onset (WASO) of healthy and demented elderly was 2.55 and 1.39. WASO was higher in healthy group without statistical significance and the reason of WASO of healthy elderly was urination, but no specific reasons were identified for demented elderly.
4) Sleep duration at night of healthy and demented elderly was 7.09hours and 6.79hours. There was no significant difference statistically between two groups.
5) Nap number and time of healthy elderly was 0.72, 0.86hours, and 0.79, 0.96hours for demented elderly. There was no significant difference statistically between two groups, however demented elderly took naps more than healthy elderly.
6) Total sleep time of healthy and demented elderly was 7.91hours ± 2.12hours and 7.75hours ± 2.03hours. There was no significant difference statistically between two groups.
3. Variance of each variables on healthy and demented elderly
There was no significant difference statistically between two groups except WASO. The variance of WASO of the healthy elderly was significantly (p < 0.05) larger than that of the demented elderly.
Upon the result of this study, the pattern of circadian rhythm of healthy and demented elderly was identified. However the differences between two groups were not found as expected when the study was initiated. Also, limitations of this study was revealed, which are limitations of sampling and measurement. For more valid data regarding circadian rhythms of the healthy and demented elderly, the effort to overcome these limitations are needed.
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KEYWORD
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