The present invention relates to an afterglowing sign printed with afterglowing pigments. 5 to about 7 osy and air permeability, provide dimensional stability and peel strength in carpets and facilitate robust cure rates in carpet manufacture. A fluctuation waveform of an ultra-low-frequency band is found from a biosignal collected from a biosignal measuring means, the fluctuation waveform is plotted as coordinate points on a four-quadrant coordinate system on the basis of a predetermined standard, and biological status is estimated on the basis of temporal change in the coordinate points. The indication of the heart rate can be displayed on the display screen as an option, in addition to the metrics that quantify the motion data.