RT info:eu-repo/semantics/article T1 Muscular Strength and Quality of Life in Older Adults: The Role of ACTN3 R577X Polymorphism A1 Fernández-Araque, Ana A1 Giaquinta-Aranda, Andrea A1 Rodríguez-Díez, Jose Andrés A1 Carretero-Molinero, Silvia A1 López-López, Jorge A1 Verde, Zoraida AB As longevity is increasing, the 65-year-old and older population is projected to increase in the next decades, as are the consequences of age-related muscle deterioration on the quality of life. The purpose of this study was to examine the associations of the ACTN3R577X polymorphism with quality of life and muscular strength in an older Spanish population. In total, 281 older adults participated in this study. Anthropometric measurements, chronic diseases, prescribed medications, quality of life, hand grip strength, and physical activity and nutritional status data were collected. ACTN3 R577X genotyping was determined using Taqman probes. Multivariate regression analysis revealed in adjusted model that, in men, the ACTN3 R577X genotype was significantly associated with hand grip strength (HGS), regression coefficient (β) = 1.23, p = 0.008, dimension 1 of the five-dimension questionnaire EuroQoL (EQ-5D, mobility), (β) = -1.44, p = 0.006, and clinical group risk (CGR) category (β) = -1.38, p = 0.006. In women, a marginal association between the ACTN3 R577X genotype and the CGR category was observed, with a regression coefficient of (β) = -0.97, (p = 0.024). Our findings suggest that the ACTN3 R577X genotype may influence the decline in muscle strength and quality of life in older Spanish adult males. PB MDPI YR 2021 FD 2021-01-25 LK https://uvadoc.uva.es/handle/10324/81727 UL https://uvadoc.uva.es/handle/10324/81727 LA eng NO Int J Environ Res Public Health . 2021 Jan 25;18(3):1055. DS UVaDOC RD 17-ene-2026