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• W2884661114 abstract "Endocrine changes due to menopause have been associated to oxidative stress and muscle mass loss. The study objective was to determine the relationship between both variables in early postmenopause. An exploratory, cross-sectional study was conducted in 107 pre- and postmenopausal women (aged 40–57 years). Levels of serum lipid peroxides and uric acid and enzymes superoxide dismutase and glutathione peroxidase, as well as total plasma antioxidant capacity were measured as oxidative stress markers. Muscle mass using bioelectrical impedance and muscle strength using dynamometry were also measured. Muscle mass, skeletal muscle index, fat-free mass, and body mass index were calculated. More than 90% of participants were diagnosed with overweight or obesity. Postmenopausal women had lower values of muscle mass and strength markers, with a negative correlation between lipid peroxide level and skeletal muscle index (r = −0.326, p < 0.05), and a positive correlation between uric acid and skeletal muscle index (r = 0.295, p < 0.05). A multivariate model including oxidative stress markers, age, and waist circumference showed lipid peroxide level to be the main contributor to explain the decrease in skeletal muscle mass in postmenopause, since for every 0.1 μmol/l increase in lipid peroxide level, skeletal muscle index decreases by 3.03 units. Our findings suggest an association between increased oxidative stress and muscle mass loss in early postmenopause. Los cambios endocrinológicos debidos a la menopausia se han asociado al estrés oxidativo y la pérdida de masa muscular. El objetivo fue determinar la relación entre ambas variables en la posmenopausia temprana. Estudio transversal exploratorio con 107 mujeres pre- y posmenopáusicas (40-57 años). Como marcadores de estrés oxidativo se midieron los niveles de lipoperóxidos plasmáticos y ácido úrico sérico, las enzimas antioxidantes superóxido dismutasa y glutatión peroxidasa, y la capacidad plasmática antioxidante total. También se midió la masa muscular por impedancia bioeléctrica y la fuerza por dinamometría, y se calculó masa músculo-esquelética, índice de masa esquelética, masa libre de grasa e índice de masa corporal. Más del 90% de las participantes fueron diagnosticadas de sobrepeso u obesidad. En las mujeres posmenopáusicas los marcadores de masa y fuerza muscular eran más bajos, con correlación negativa entre el nivel de lipoperóxidos y el índice de masa esquelética (r= –0,326, p< 0,05), y positiva entre el ácido úrico (r=0,295, p< 0,05) y el mismo índice. En un modelo multivariante que incluye los marcadores de estrés oxidativo, edad y circunferencia de cintura, se encontró que el nivel de lipoperóxidos es el que más contribuye a explicar la disminución de la masa esquelética en la posmenopausia; por cada aumento de 0,1 μmol/l de lipoperóxidos hay un decremento del índice de masa esquelética de 3,03 unidades. Nuestros hallazgos sugieren una asociación entre el aumento del estrés oxidativo y la pérdida de masa muscular en la posmenopausia temprana." @default.
• W2884661114 created "2018-08-03" @default.
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• W2884661114 date "2018-06-01" @default.
• W2884661114 modified "2023-09-27" @default.
• W2884661114 title "Relationship between oxidative stress and muscle mass loss in early postmenopause: An exploratory study" @default.
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• W2884661114 doi "https://doi.org/10.1016/j.endien.2018.01.006" @default.
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