環境要因と被験者の体動及び心拍変動が主観的睡眠感に及ぼす影響

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  • EFFECTS OF ENVIRONMENTAL FACTORS, SUBJECT'S BODY MOTION, AND HEART RATE VARIABILITY ON SUBJECTIVE FEELING OF SLEEP
  • カンキョウ ヨウイン ト ヒケンシャ ノ タイドウ オヨビ シンパク ヘンドウ ガ シュカンテキ スイミンカン ニ オヨボス エイキョウ

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<p> In this study, in order to avoid restricting the human body movement, non-contact, non-invasive and non-restrained mat type body motion sensors that measure fluctuations of a pressure loaded on the mat by the human body were used to determine heart rate, respiratory rate, and body motion. The indoor air and wall surface temperatures, humidity, carbon dioxide concentration, illuminance, and airflow speed were measured in the room as environmental factors during sleep. A questionnaire survey was conducted to clarify the sleep quality that the examinee felt just after sleep by OSA sleep inventory MA version (OSA). The obtained heart rate data is numerically analyzed to calculate Heart rate variability (HRV). HRV is the temporal fluctuation of heart rate (HR) and has been often used in the study of autonomic nerve activity of human body. In this analysis, HRV is calculated by an original method with reference to the European guidelines for calculating HRV using ECG data.</p><p> As subjective evaluation of sleep, Structural Equation Modeling (SEM) by exploratory factor analysis was performed between Environmental factors, the body motion and the HRV (vital factors), and results from OSA. This analysis was used Environmental factors and vital factors classified by the entire sleep time, period of 90 minutes after the start of sleep (first90), and period of 90 minutes before getting up (last90).</p><p> Fig. 5, 6, 7, 8, 9 shows result of SEM that adopted fit measures by discrepancy, SRMR, GFI and CFI. Fig. 5 suggest that OSA’s “Sleepiness or rising” might be affected by the average body motion count and heart rate (HR) at first90. Fig. 6 suggest that OSA’s “Initiation and maintenance of sleep” might be affected by the average body motion count at first90 and the average carbon dioxide concentration at the entire sleep time. Fig. 7 suggest that OSA’s “Frequent dreaming” might be affected by the average LF/HF at the entire sleep time and the standard deviation HR at last90. Fig. 8 suggest that OSA’s “Refreshing” might be affected by the average body motion count, HR, and wall radiation temperature at first90. Fig. 9 suggest that OSA’s “Sleep length” might be affected by the average body motion count at first90 and the average carbon dioxide concentration at the entire sleep time. These means first90 is most important for sleep quality. And that the average of the HR at first90 might be affected by the average of the wall radiation temperature during that period. And more that the standard deviation of HR at last90 might be affected by the average and the standard deviation of the carbon dioxide concentration and the average of the wall radiation temperature during that period.</p><p> Among the environmental factors, carbon dioxide concentration and wall radiation temperature were the factors that most affected subjective feeling of sleep.</p><p> These models suggested that there were more factors affecting the results. On the other hand it was suggested that optimizing the indoor environment could improve the subjective feeling of sleep.</p>

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