PROBLEM TO BE SOLVED: To estimate a dynamic characteristic value of a skin, a parameter R0, using biological information capable of being measured by a wearable apparatus and further calculate a skin age.SOLUTION: A regression equation between a heart rate at the time of activities in a daily life and a maximal extension length of a skin at the time of being sucked (hereinafter referred to as a parameter R0) measured by a skin viscoelasticity measuring device is acquired. On the basis of the regression equation, a parameter R0 of a subject's skin is estimated from a heart rate at the time of activities in the subject's daily life. Also a regression equation between the parameter R0 and actual ages is acquired in advance. By using the regression equation, the subject's skin age (an age viewed from dynamic characteristic value) is calculated from the subject's estimated parameter R0.SELECTED DRAWING: Figure 5COPYRIGHT: (C)2020,JPO&INPIT【課題】ウェアラブル機器で測定できる生体情報を用いてパラメータＲ0という皮膚の力学的特性値を推定し、さらには肌年齢を算出する。【解決手段】日常生活の活動時における心拍数と、皮膚粘弾性測定装置で測定される吸引時の皮膚の最大伸展長（以下、パラメータＲ0という）との回帰式を取得し、該回帰式に基づいて、被験者の日常生活の活動時における心拍数から被験者の皮膚のパラメータＲ0を推定する。また、パラメータＲ0と実年齢との回帰式を取得しておき、この回帰式を用いて被験者のパラメータＲ0の推定値から被験者の肌年齢（力学的特性値からみた年齢）を算出する。【選択図】図５
