The role of cardiorespiratory fitness and body composition in the association between physical activity and menopausal symptoms

Objective: The aim of the study was to conduct exploratory analyses on the role of cardiorespiratory fitness (CRF) and body composition in the association between physical activity and menopausal symptoms. Methods: This was a cross-sectional (N = 298) study of women aged 51-59 years including a subsample of 82 women followed for 4 years. The severity of menopausal symptoms was assessed with the Menopause Rating Scale in total symptoms as well as using the somato-vegetative, psychological, and urogenital subscales. Physical activity was assessed with accelerometers and self-reports, body composition with dual-energy x-ray absorptiometry, and CRF with a custom-made prediction model based on the six-minute walking distance and spiroergometry. The associations of interest were studied using unstandardized regression coefficients derived from multiple linear regression models with the severity of menopausal symptoms as the outcome. Results: Higher total body and fat mass (kg) were associated with more severe total symptoms (B = 0.06 [95% CI, 0.01 to 0.12] and 0.07 [0.01 to 0.14], respectively) as well as somato-vegetative (0.03 [0.01 to 0.05]; 0.04 [0.01 to 0.06]) and psychological symptoms (0.03 [0.00 to 0.05]; 0.03 [0.00 to 0.06]) in cross-sectional design. Total and lean body mass interacted with physical activity in total and psychological symptoms with stronger indirect associations being observed in participants with lower total and lean body mass. CRF was not associated with menopausal symptoms and did not interact with physical activity. Conclusions: Maintaining a healthy weight is associated with less severe menopausal symptoms in middle-aged women. The association between physical activity and the severity of menopausal symptoms varied based on the differences in total and lean body mass.