Study on using the heart rate peak sensor to detect the first moment of doze

In this work, a wireless sensor was developed using the screen out method. The study distinguishes itself from previous studies in terms of the research methodology; specifically, this study uses a R-wave amplitude (RWA) as the primary data source. The findings indicate that RWA demonstrated distinctive changes while research subjects were awake or sleep; RRI also changes during the transitional period between the two psychological conditions. Based on this unique quality, the study determined whether a research subject has entered the first dozing stage, while allowing the determining program to respond distinctively and promptly. Experimental results indicate that the analysis result of frequency domain of RII represent the activity state of autonomic nervous system (ANS). When the LF and HF ratio are smaller than 1(LF/HF <; 1), this shows that HR has been equally diminished, designating the beginning of a dozing state. Using the same RWA data for detrended fluctuation analysis (DFA).