Mid-upper arm circumference as a screening tool for identifying physical frailty in community-dwelling older adults: The Korean Frailty and Aging Cohort Study

Aims: Frailty in older adults is influenced by various factors, such as poor nutritional status. Mid-upper arm circumference (MUAC) is a validated, simple, and non-invasive tool for assessing nutritional status. Despite its potential, no study has explored the association between MUAC and physical frailty in older adults. This study aims to investigate this association and assess whether MUAC can be used as a screening tool in community and primary clinical practice. Methods: A cross-sectional study was conducted with 1178 participants aged 71.8 to 86.7 years from the 2019 Korean Frailty and Aging Cohort Study (KFACS). Physical frailty was defined using the Fried frailty phenotype criteria. MUAC was measured as the average circumference of both upper arms without compressing the subcutaneous tissue. Odds ratios (ORs) and 95% confidence intervals (CIs) for physical frailty, stratified by sex, were estimated using multiple logistic regression analysis after adjustments. Results: MUAC was lower in physically frail men compared with non-frail men (28.0 ± 2.9 vs. 29.4 ± 2.6 cm, P < 0.001). MUAC was negatively correlated with the Frailty Index (r = −0.155, P < 0.001). Multiple logistic regression analysis revealed that MUAC was an independent factor for physical frailty in men (OR 0.986, 95% CI 0.973–1.000, P = 0.049). The optimal MUAC cutoff for identifying physical frailty in men was 28.2 cm (sensitivity 60.7%, specificity 71.4%, AUC 0.672, 95% CI 0.595–0.749, P < 0.001). No significant results were found for women. Conclusion: Low MUAC is significantly associated with physical frailty in older men, suggesting the potential for MUAC to be utilized as a screening tool for physical frailty in community and primary clinical settings. Geriatr Gerontol Int 2024; 24: 1292–1299.