Association between anemia and dynapenia in older adults: a population-based study

Background: Few reports have been issued on the relationship between anemia and dynapenia in older people. Aim: This study aimed to assess the independent association between anemia and dynapenia in older adults. Methods: This study was based on an analysis of the Korea National Health and Nutrition Examination Survey database (2015–2018). A total of 4812 subjects aged ≥ 65 years were included. Dynapenia was defined by a handgrip strength (HGS). The independent association between dynapenia and anemia was examined by complex-sample multivariable logistic regression analyses. Results: The geometric mean serum hemoglobin level for all study subjects was 13.73 g/dL, and the prevalence of anemia was 13.1% (men, 12.8%; women 13.4%). Anemic subjects had a significantly lower adjusted mean HGS than non-anemic controls (23.14 ± 0.45 kg vs. 24.50 ± 0.38 kg, P < 0.001). Furthermore, anemic subjects had a significantly higher odds ratio for dynapenia (OR, 1.68; 95% CI, 1.30–2.17) than subjects without anemia after adjusting for multiple confounders, and the odds ratio of dynapenia was higher for anemic men (OR, 2.06, 95% CI, 1.38–3.09). Conclusion: This study indicates anemia is independently associated with dynapenia in older Koreans, especially in men, and indicates that dynapenia screening is needed in older people with anemia.