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Compartimentos hídricos, distribuição de fluidos e força muscular em mulheres pós-menopausicas
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Introdução: O objetivo deste estudo foi analisar o papel dos compartimentos hídricos e distribuição hídrica, estimados pela impedância bioelétrica (BIA), na explicação da força de preensão do membro superior dominante (FPMSD) e força máxima dos membros inferiores (FMMI), em mulheres pós-menopáusicas, ajustando para co-variáveis.
Métodos: Foram avaliadas 137 mulheres, com idade média de 61,3 ± 6,4 anos. A água corporal total (ACT), água intracelular (AIC) e água extracelular (AEC) foram estimadas com recurso à BIA. A massa isenta de gordura (MIG) e massa gorda (MG) foram determinadas através da densitometria radiológica de dupla energia (DXA). A FPMSD foi medida com recurso a um dinamómetro (Jamar), no membro superior dominante de cada participante. A FMMI foi obtida através do teste horizontal de contração máxima dos membros inferiores, com recurso a uma prensa de pernas horizontal (S0409, BPH)
Resultados: Independentemente da idade, terapêutica hormonal, toma de diuréticos, MIG MI e MG total, a AIC, ACT, e rácio AEC/AIC apresentam correlação significativa na explicação da FMMI (ß= 0,326; p<0,01, ß=0,323; p<0,01 e ß= -0,220; p<0,01, respetivamente).
Contudo, nenhum dos compartimentos hídricos e distribuição hídrica foi determinante na predição dos valores de FPMSD.
Conclusão: Valores mais altos da AIC sugerem valores superiores de força nas mulheres pós-menopáusicas, sugerindo que a AIC não tem apenas função estrutural, mas também funcional.
Introduction: The objective of this study was to analyze water compartments and fluid distribution, estimated by bioelectric impedance analysis (BIA), as predictors of maximum dominant handgrip strength (MDHS) and maximum strength of the leg (MSL), in post-menopausal women, adjusting for covariates. Methods: A total of 137 women were analyzed, with a mean age of 61.3 ± 6.4 years. Total body water (TBW), intracellular water (ICW) and extracellular water (ECW) were estimated using BIA. Fat-free mass (FFM) and total Fat-mass (FM) were determined by dual-energy X-ray absorptiometry (DXA). The MDHS was measured with a dynamometer (Jamar), using the dominant upper limb. To determine MSL, horizontal leg press test was performed, measuring the maximum contraction strength (S0409, BPH). Results: Regardless of age, hormonal therapy, taking diuretics, lower limbs fat-free mass and total fat-mass, ICW, TBW and ECW:ICW ratio had a significant correlation in the explanation of MSL (ß= 0.326; p<0.01, ß=0.323; p<0.01 e ß= -0.220, p<0.01, respectively. In the other hand, none of water compartments and fluid distribution, was decisive in predicting MDHS values. Conclusion: Higher values of ICW can predict higher strength values in post-menopausal women, suggesting that the ICW does not have only structural function but also functional dimension.
Introduction: The objective of this study was to analyze water compartments and fluid distribution, estimated by bioelectric impedance analysis (BIA), as predictors of maximum dominant handgrip strength (MDHS) and maximum strength of the leg (MSL), in post-menopausal women, adjusting for covariates. Methods: A total of 137 women were analyzed, with a mean age of 61.3 ± 6.4 years. Total body water (TBW), intracellular water (ICW) and extracellular water (ECW) were estimated using BIA. Fat-free mass (FFM) and total Fat-mass (FM) were determined by dual-energy X-ray absorptiometry (DXA). The MDHS was measured with a dynamometer (Jamar), using the dominant upper limb. To determine MSL, horizontal leg press test was performed, measuring the maximum contraction strength (S0409, BPH). Results: Regardless of age, hormonal therapy, taking diuretics, lower limbs fat-free mass and total fat-mass, ICW, TBW and ECW:ICW ratio had a significant correlation in the explanation of MSL (ß= 0.326; p<0.01, ß=0.323; p<0.01 e ß= -0.220, p<0.01, respectively. In the other hand, none of water compartments and fluid distribution, was decisive in predicting MDHS values. Conclusion: Higher values of ICW can predict higher strength values in post-menopausal women, suggesting that the ICW does not have only structural function but also functional dimension.
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Água intracelular Água extracelular Água corporal total Impedância Bioelétrica Força máxima dos membros inferiores Handgrip Menopausa Envelhecimento Distribuição hídrica Mulheres pós-menopáusicas Intracellular water Extracellular water Total body water Bioelectric impedance Handgrip Maximum strength of the leg Menopause Ageing Fluid distribution Post-menopausal women