PROBLEM TO BE SOLVED: To provide an apparatus which specifies and detects a change in a biological state based on a fluctuation in a biological rhythm.SOLUTION: The present invention has a configuration which determines on the basis of a frequency gradient time series waveform, preferably a frequency gradient time series waveform obtained using a zero crossing point, whether or not a function adjustment signal that has a frequency below the changeover frequency of a cardiocirculatory fluctuation characteristic continues at least for a predetermined time. A fluctuation in the circadian clock, i.e., the biological rhythm, is clearly reflected in a long-period frequency component (function adjustment signal). In particular, the fluctuation has a strong effect on a frequency gradient time series waveform obtained using a zero crossing point. The fluctuation is therefore suitable for detecting a specific biological phenomenon emergence period brought about by a fluctuation in the biological rhythm such as jet lag.COPYRIGHT: (C)2015,JPO&INPIT【課題】生体リズムの乱れに基づいた生体状態の変化を特定し、検出する装置を提供する。【解決手段】心循環系のゆらぎの特性が切り替わる周波数よりも低い周波数の機能調整信号が所定時間以上継続しているか否かを、周波数の傾き時系列波形、好ましくは、ゼロクロス点を用いて求めた周波数の傾き時系列波形において判定する構成を有する。体内時計すなわち生体リズムの乱れは長周期の周波数成分(機能調整信号)に顕著に現れ、特に、ゼロクロス点を用いた周波数の傾き時系列波形に顕著に影響することから、時差ぼけ等の生体リズムの乱れを要因とする特有の生体現象出現期を検出するのに適している。【選択図】図2
