指尖容積脈波解析を用いた情動ストレス刺激時における自律神経機能評価

摘要

The aim of this research was to evaluate the autonomic nervous reaction using photoploethys-mography under the emotional stimuli. Twenty healthy adults (11 males and 9 females) with a mean age of 25.0 ± 5.0 were assessed for their psychosomatic states using Cornell Medical Index (CMI) and classified into two groups: group I (healthy) and II-IV (neurotic tendency). The photoplethysmography under emotional stimuli using the audiovisual video footages for 40 seconds and during recalling the contents of the footages soon after the stimuli for 180 seconds was measured. These series were repeated three times. The emotional stimuli consisted of "positive stimuli" and "negative stimuli". The "positive stimuli" such as relaxed and pleasant stimuli could evoke a positive feeling, while the "negative stimuli" such as unpleasants #1 (human-relation problem) and #2 (fear) stimuli could evoke a negative feeling. Pulse waves from photoplethysmography were analyzed for estimating the pulse wave amplitude, reflection index (RI). and pulse wave length, and these values of two groups were compared using analysis of variance (ANOVA). The results showed that the pulse wave amplitudes of group I under and after the positive simuli were significantly larger than the amplitudes under and after the negative stimuli, respectively. On the other hand, there was no obvious difference of the pulse wave amplitudes of group II-IV between the positive and negative stimuli. RI of group I during and before the stimuli was smaller than the base line, and RI under the unpleasant #2 stimuli was smallest in all the stimuli. However, RI of group II-IV under the unpleasant #2 stimuli was largest in all the stimuli. The pulse wave length under the unpleasant #1 stimuli was significantly larger than the other stimuli, and the pulse wave length after the stimuli was significantly smaller than the base line. These results suggested that the autonomic nervous reaction under emotional stimuli would be regulated based on the psychosomatic states.