2008 年 22 巻 6 号 p. 29-34
Background In our on-going research we have been investigating as how the acceleration plethysmogra phy (APG) can possibly be employed as a simple way for detecting autonomic modulations. The quantitative capturing of the autonomic modulations would have a certain merit for primary care. As a preliminary step, it seemed essential to observe autonomic nerve response by a certain mental load. As one of temporary mental loads, we designed the “Kingyo program”. Specifically, it determines the number of the swimming goldfishes in an allotted time. The purpose of the current research is to examine the effectiveness of the “Kingyo program” through which the autonomic nerve response could be observed.
Methods Six healthy male university students were examined. Employing the frequency analysis in the APG system before and after loading games, we obtained total spectral power, the proportion of the spectral element in the low frequency area (LF%), the proportion of the spectral element in the high frequency area (HF%), and the LF/HF ratio. This process was repeated 3 times for each subject on different days. The distribution of each variable obtained before and after the games was compared by Wilcoxon tests.
Results The distribution of HF% significantly moved to lower level, where as the distribution of LF/HF ratio showed a significant shift to upper level after each game.
Conclusion It is considered that the five games of the “Kingyo program” controlled the vagal activity, or emphasized a sympatho/vagal balance. For investigating the autonomic nerve response, this program could have the merit as one of a temporary mental load.