Relationship between physical activity level and balance in middle-aged and older women / Relação entre o nível de atividade física e equilíbrio em mulheres na meia-idade e idosas

Abstract Introduction: Physical exercise may improve motor skills, such as static standing balance. However, the association between physical activity level based on activities of daily living and static balance is unknown. Objective: To assess the association between the physical activity level and static balance in middle-aged and older women. Methods: This cross-sectional study involved 589 community-dwelling women. Static balance was assessed using the single-leg stance test (SLST) with eyes open and closed. Physical activity level was assessed using the International Physical Activity Questionnaire Short Form and classified as high, moderate, or low. Kruskal-Wallis test compared balance performance between participants with different physical activity levels. Multiple quantile regression analyses assessed the association between variables adjusted for age, family income, educational level, body mass index, comorbidities, and parity. Results: Participants with low physical activity level showed worse SLST performance with eyes open and closed than participants with high physical activity level in the bivariate analysis. However, physical activity level and SLST performance were not associated in the analysis adjusted for covariates. Conclusion: Our results suggested that only being active in daily living activities is not associated with better standing balance in middle-aged and older women. Specific physical exercise programs should be implemented to improve balance in this population.

Resumo Introdução: O exercício físico pode melhorar as habilidades motoras, como o equilíbrio estático na posição ortostática; no entanto, a associação do nível de atividade física durante as atividades de vida diária e o equilíbrio estático não é conhecida. Objetivo: Avaliar a associação entre o nível de atividade física e o equilíbrio estático em mulheres de meia-idade e idosas. Métodos: Trata-se de um estudo transversal com 589 mulheres residentes na comunidade. O equilíbrio estático foi avaliado usando o teste de equilíbrio unipodal com os olhos abertos e fechados. O nível de atividade física foi avaliado usando o Questionário Internacional de Atividade Física - versão curta e classificado em alto, moderado e baixo. O teste de Kruskall Wallis comparou o desempenho no teste de equilíbrio unipodal de participantes com diferentes níveis de atividade física. Modelos de regressão quantílica avaliaram a associação entre as variáveis ajustada pelas covariáveis idade, renda familiar, escolaridade, índice de massa corporal, condições crônicas e paridade. Resultados: Na análise bivariada, as mulheres com baixo nível de atividade física mantiveram o equilíbrio em pé com os olhos abertos e fechados por um tempo menor do que aquelas classificadas como alto nível de atividade física. No entanto a associação entre nível de atividade física e performance no teste de equilíbrio estático não foi significativa na análise ajustada para as covariáveis. Conclusão: Os resultados sugerem que apenas ser ativa nas atividades de vida diária não está associado a um melhor equilíbrio em mulheres de meia-idade e idosas. Programas específicos de exercício físico devem ser implementados visando um melhor desempenho do equilíbrio nesta população.

The role of multiparity and maternal age at first pregnancy in the association between early menarche and metabolic syndrome among middle-aged and older women.

OBJECTIVE: To analyze whether maternal age at first pregnancy and parity are mediators of the association between early menarche and metabolic syndrome in a sample of middle-aged and older women. METHODS: Cross-sectional study of 428 women (40 to 80 y), who had experienced a pregnancy in their lifetime, was performed between 2014 and 2016. Age at first pregnancy, parity, and early menarche were self-reported. Metabolic syndrome was assessed using the criteria described by the National Cholesterol Education Program's Adult Treatment Panel III. The association between metabolic syndrome and early menarche was assessed by logistic regression analysis. The mediating role of age at first pregnancy and multiparity in the relationship between early menarche and metabolic syndrome was assessed through mediation analysis, adjusted for covariates. RESULTS: According to adjusted logistic regression models, early menarche was associated with higher odds of prevalent metabolic syndrome (OR: 2.26; 95% CI: 1.15-4.46). Mediation analysis showed a significant direct effect of early menarche on metabolic syndrome (ß: 0.808; 95% CI: 0.107-1.508). Of the two mediators tested, age at first pregnancy was significant (ß: 0.065; 95% CI: 0.004-0.221), ie, participants with and without early menarche differ, on average, by 0.879 SDs in the log odds of MetS (total effect), of which 0.065 SDs (8%), on average, would be attributable to the effect of early menarche on age at first pregnancy (indirect effect), which, in turn, affects MetS. CONCLUSIONS: Age at first pregnancy may partially contribute to the association between early menarche and metabolic syndrome among middle-aged and older women who had experienced a pregnancy over their lifetime.