Despite the well-known benefits of exercise on the physical and mental health of postnatal women, none of the former studies had evaluated the impact of moderate exercise on breast milk cortisol in healthy lactating women. Therefore, the aim of this study was to investigate the impact of moderate exercise on breast milk cortisol in healthy lactating women. Forty-seven healthy lactating women, between 1 and 5 months postpartum, were distributed randomly into two groups. The control group received only lactational and nutritional counseling for 4 weeks, while the exercise group received the same lactational and nutritional counseling, as well as engaged in an aerobic exercise program of moderate intensity for 4 weeks. Breast milk cortisol was assessed pre and post-intervention. The breast milk cortisol showed a significant decrease (P=0.001) within both groups, while it showed a non-significant difference between both groups post-intervention (P>0.05). Moderate aerobic exercise doesn’t have any negative impact on breast milk cortisol in healthy lactating women.


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