Rationale and design of Juntendo Sarcopenia Registration to explore the predictors and prognosis of sarcopenia and frailty in the elderly in TOKYO (JUSTICE‐TOKYO)

Aim This study aimed to clarify the prevalence, predictors, and prognosis of frailty and sarcopenia in both cross‐sectional and longitudinal study of the real world. Methods The JUSTICE‐TOKYO study is a single‐center, prospective observational study of elderly patients. Patients aged ≥65 years who regularly visited our center were enrolled and followed up for 4 years ( n = 1042). The diagnosis of sarcopenia and frailty in the enrolled patients was based on the criteria established by the Asian Working Group for Sarcopenia and Japanese version of the Cardiovascular Health Study criteria, respectively. The primary end point is the incidence of all‐cause mortality and hospitalization for treatment. The secondary end points are clinically significant bleeding, cardiovascular events, strokes, malignancies, incidence of falling, fractures, pneumonia, and the onset of new dementia cases. Results A total of 1042 patients were enrolled in this study. The mean age of the cohort at baseline was 78.2 years, with 56% being women. Among the enrolled patients, 223 (21.4%) diagnosed with sarcopenia, 172 (16.5%) exhibited frailty, and 541 (51.9%) fell into the prefrailty category. Conclusions The JUSTICE‐TOKYO study provides valuable insights into the prevalence of sarcopenia and frailty among older adult outpatients in a real‐world context and contributes to measures aimed at extending healthy life expectancy. Geriatr Gerontol Int 2024; 24: 168–172 .