Cerebral blood volume in the sleep measured by near-infrared spectroscopy |
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| Authors: | S. SHIOTSUKA Y. ATSUMI S. OGATA R. YAMAMOTO M. IGAWA K. TAKAHASHI H. HIRASAWA K. KOYAMA A. MAKI Y. YAMASHITA H. KOIZUMI M. TORU |
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| Affiliation: | Saitama Comprehensive Mental Health Center, Saitama;Department of Education for the Emotionally Disturbed, The National Institute of Special Education, Yokosuka;Department of Neuropsychiatry, Tokyo Medical and Dental University;Tokyo Metropolitan Geriatric Hospital;Central Research Laboratory, Hitachi Ltd, Tokyo, Japan |
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| Abstract: | Abstract We investigated the relationship between hemodynamic changes in the cortex measured by near-infrared spectroscopy (NIRS) and the polysomnographic changes during sleep. Four healthy male volunteers participated in the study. Near-infrared spectroscopy measuring and polysomnographic recordings were done simultaneously during sleep. In many case, oxy-hemoglobin (oxy-Hb) decreased and deoxy-hemoglobin (deoxy-Hb) increased during the transition from wakefulness to sleep, and oxy-Hb increased toward deep sleep. Oxy-Hb and deoxy-Hb had larger fluctuations during REM sleep than those during non-REM sleep. During REM sleep, oxy-Hb often showed a lower level and deoxy-Hb showed a higher level than those during the preceding and following non-REM sleep. |
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| Keywords: | deoxy-hemoglobin near-infrared spectroscopy oxy-hemoglobin sleep |
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