Recently, it became possible to observe non-invasively bio information for a long period by development of bio engineering and it was made known that a rhythm or fluctuation exists in a bio function universally. The rhythm means a periodic change in human body, for instances heart beat and female menses. Especially, short and long period rhythm in an autonomic nerve play an important role in any situation of life activities. And this observation of rhythm became easier and more accurate by using an indicator 'heart rate variability'. In frequency analysis of heart rate variability, it is known that LF(Low-Frequency) component of O.O4～0.15Hz and HF(High-Frequency) component of over 0.15Hz exist. HF component is said to be an indicator of activity in vagus nerve which is parasympathetic. LF component is controlled both sympathetic nerve and parasympathetic nerve. This report aims at estimating function of nervous circulating regulation by frequency analysis of time series data of-heart rate variability.
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