Abstract
Obesity and exercising affect the risk for breast cancer in an opposite direction. From recent data, it was found that training during night hours can mitigate the beneficial effects of exercise on that risk. In the present study, it was examined the simultaneous effect of daytime or nighttime exercise and woman’s weight on the risk of breast cancer. It was concluded that the impact of nighttime exercise on breast cancer risk was marginally influenced by woman’s weight. The aim of the study was to examine the simultaneous effect of daytime or nighttime exercise and woman’s weight on the risk of breast cancer. A retrospective analysis of ninety-two women with or without a history of breast cancer, examining concurrently the influence of daytime or nighttime exercise and weight on breast cancer risk. In the simultaneous assessment of woman’s weight and exercise on breast cancer risk, it was found that the effect of the nighttime exercise remained strong, despite an increase in the confidence interval of the associated risk. The impact of nighttime exercise on breast cancer risk was marginally affected from the woman’s weight.
Highlights
Excess adiposity and inactivity increase both breast cancer risk and poor outcomes in individuals diagnosed with breast cancer [1]
The statistical analysis of the sample showed that the odds ratio-for no protection from breast cancer was almost three times higher in women exercising during nighttime hours compared with women exercising during daytime hours
This result seemed to mainly derive from the higher number of the healthy women without a history of breast cancer exercising during non-night hours compared to the ones with a history of breast cancer exercising during non-night hours and not exclusively from the comparison of relevant data during night hours per se
Summary
Excess adiposity and inactivity increase both breast cancer risk and poor outcomes in individuals diagnosed with breast cancer [1]. Obesity in postmenopausal women is included in the major factors that has been consistently associated with a higher risk of breast cancer from both European [2] and US [3] data. Postmenopausal women who lose weight have lower breast cancer risk than those with stable weight [4]. Exercise seems to protect from breast cancer [5]. This protection is likely mediated through weight control and hormonal influences such as impairing serum insulin levels and reducing sex hormones [6, 7]. We confirmed the beneficial effect of exercise in breast cancer risk. It was found that the previous protection seems to be mitigated with exercising exclusively in nighttime hours [11]
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