| Budget Amount *help |
¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 2003: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 2002: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Research Abstract |
To investigate whether the sleeping pattern is affected by previous nocturnal sleeping, 29 healthy men and women (19-31 years old, average 20.9 years) were videotaped over 7 hours (0:00 to 7:00 a.m.) for two consecutive nights, and recorded sleeping positions were classified into 28 patterns based on the directions of the head, chest and waist. Sleeping habits and the degree of satisfaction upon awakening were also surveyed by questionnairing. In the 19 subjects (men), 7.79±0.54 (mean±SE) positional patterns were observed during the 1st night, which was positively correlated with 7.05±0.42 during the 2nd night (r=0.63, p<0.01), indicating subject-specific positional patterns. The mean frequency of positional changes was 32.42±3.22 during the 1st night and positively correlated with 33.58±2.67 during the 2nd night (r=0.69, p=0.001), indicating again the subject-specific frequency of positional changes. In the 10 subjects (women), 6.30±0.65 (mean±SE) positional patterns were observed dur
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ing the 1st night, which was positively correlated with 6.70±0.68 during the 2nd night (r=0.89, p<0.001), indicating subject-specific positional patterns. The mean frequency of positional changes was 23.60±4.76 during the 1st night and positively correlated with 24.0±3.37 during the 2nd night (r=0.91, p<0.001), indicating again the subject-specific frequency of positional changes. These results indicate that the same subject takes similar sleeping positions and changes the position at similar frequencies.
In addition, since one healthy adult female subject showed an extremely low frequency of rolling over, we thought that clarification of the mechanism of body pressure dispersion in this subject would be useful for prevention of bedsore. Thus, we investigated how this subject is involuntarily modulating he body weight distribution. As a result, the subject was found to change the body weight distribution by flexion and extension of the neck and knees. This finding suggests that passive postural changes will become possible without worsening a habitual feeling of sleeping. Less
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