Associação entre hipovitaminose D, força muscular e capacidade funcional em idosos comunitários

Abstract

Objective: Explore the association among hypovitaminosis D, muscle strength and functional capacity in Brazilian community dwelling elderly. Methodology: Observational, analytical and cross-sectional study based on a convenient sample. The concentrations of 25(OH)D were researched by Enzyme Linked Fluorescent Assay (ELFA).The strength of palmar grip and isometric quadriceps force were measured by Jamar® and Lafayette® 01165 using manual dynamometers respectively. Short Physical Performance Battery (SPPB) evaluated the functional capacity. For FPP and FIQ, unvaried regression was performed, and variables of p<0,20 were included in the logistical regression model (α= 5%). For the SPPB, Pearson chi-square and Kruskal Wallis tests were held to compare the variables. Results: One hundred and fifty individuals from community dwelling elderly (aged 67,18 ± 5,33) participated in the study. The serum level of 25(OH)D of the participants was classified as follows: 60,7% as hypovitaminosis D (48% insufficient + 12,7% deficient) and 39,3% sufficient. No association between hypovitaminosis D and the considered variables (p = 0,841 for FPP; p = 0,462 for logFIQ and p = 0,617 for SPPB) was found. The variants gender, age, usage of nutritional supplements and analgesic presented major correlation with FPP, explained by 58,2% of its variability while the variables age, gender, pain and physical activity justified 25,5% of logFIQ. Regarding the functional capacity, only the aspect of age (p=0,009) showed a statistic difference in that sample. Conclusion: In a group of Brazilian community dwelling elderly, hypovitaminosis D was not associated with the decline of muscle strength and functional capacity. Longitudinal studies measuring time of usage and dosages of vitamin D should be incentivized.