Early detection and prevention of frailty are important for extending healthy life expectancy. Although the Japanese version of Cardiovascular health study (J-CHS) criteria are used to judge frailty, a more objective evaluation method has not been fully established. In this study, we focused on the Sit to Stand-five test (SS-5), which is often used in medical practice because it is a simple and easy way to evaluate lower limb function. We proposed a data processing method and an evaluation method to discriminate healthy, prefrailty and frailty using SS-5 data measured with a floor reaction force meter. We compare the proposed method with the J-CHS criteria to verify its usefulness.
