Analysis of heart rate variability of navigator at in/from ports by wavelet transform

The purpose of this paper is to analyse heart rate variability of a navigator at departure or arrival by the wavelet transform and we tackle the difference between an actual ship and ship's bridge simulator by utilizing a physiological index of heart rate variability. SNS (sympathetic nervous system) and PNS (parasympathetic nervous system) is calculated by using the frequency component range. Because we think that the influence of the mental burden of the navigator is not clear yet in each case, in other words, the kind or strength of their mental burden is not clear and also training of ship or navigational instrument handling by simulator does very well, we need to know the effect from the standpoint of human sensation. So we propose a method of finding an index of assessment of the mental burden by using a ratio of SNS to average of SNS among departure or arrival. The results show that this index was effective.