Relationship reversal of autonomic function and sleep patterns

Saturday, 14 February 2015
Exhibit Hall (San Jose Convention Center)
Mizuki Nakajima, Jissen Women's University, Tokyo, Japan
Recently, it was revised Sleep Guideline for Health Promotion 2014 by Ministry of Health in Japan. It was not only partly reported as related occupational ergonomics: patterns of performance degradation and restoration during sleep restriction and subsequent recovery; effects of recovery sleep after one work week of mild sleep and performance, but also association between mobile device and sleep disturbances among Japanese adolescents. The purpose of this study was to investigate the relationship between autonomic nerves function and sleep behavior in Japanese young people. Methods: There were 24 healthy students(male:X, female:Y) participated in this study. Jissen Women’s University Ethics Committee approved the study. It was evaluated the autonomic nerve function from Electrocardiogram(ECG). It was recorded ECG from all subjects during quite rest seated the chair with eye close and open, respectively 8 minitues. Also the sleep of Morningness-Eveningness questionnaire were counting for each subjects. It was referred the definition of autonomic nerve function below: low frequency component (LF, 0.04–0.15Hz), high frequency component (HF, 0.15-0.50 Hz), LF/HF ratio and VLF(0.0033-0.04Hz) from the R-R intervals spectrum from each ECGs. Results: There was no student typical extreme behavior of sleep condition both morningness and eveningness. Therefore, almost subject was analyzed to determine the eveningness sleep condition. It was observed 58% subjects increasing LF/HF with eye closed compared eye open tasks. Discussion: These results would suggest that student of enough sleeping condition may produce a shift to sympathetic nervous system dominance in daily activity with eye close, whereas repeated exposures to game and Internet task until late at night may produce a shift to sympathetic nervous system dominance which lasts not into the rest environment with short term eye closed period. And some people don’t relax with eye close. It’s concluded that the sleep environment of eveningness was influenced the balance of the autonomic nerve function in Japanese student.