# The Association of Sleep Trouble and Physical Inactivity with Breast Cancer Risk in Nova Scotia: Evidence from the Atlantic PATH Cohort

## TL;DR

This study found that frequent sleep trouble increases breast cancer risk, while high physical activity lowers it, based on data from over 10,000 women in Nova Scotia.

## Contribution

The study provides new evidence linking frequent sleep trouble and physical inactivity to breast cancer risk in a Canadian population.

## Key findings

- Frequent sleep trouble was associated with a 2.41-fold increased odds of breast cancer.
- High physical activity was linked to a 0.58-fold reduced odds of breast cancer.
- No significant association was found between sleep duration and breast cancer risk.

## Abstract

Breast cancer is a major public health concern, and modifiable health behaviors such as sleep quality and physical activity may influence risk. This study examined the associations between self-reported sleep trouble, sleep duration, and physical activity with breast cancer incidence in a prospective longitudinal cohort of 10,305 females from Nova Scotia. Breast cancer cases were identified through record linkage to the Nova Scotia Cancer Registry. Multivariable logistic regression models were used to estimate adjusted odds ratios (AORs) and 95% confidence intervals (CIs), accounting for sociodemographic factors, reproductive history, comorbidities, and other health behaviors. Frequent sleep trouble (“all of the time”) was significantly associated with increased odds of breast cancer (AOR = 2.41, 95% CI = 1.09–5.34, p = 0.03), while no significant associations were observed between sleep duration and breast cancer risk. High physical activity was significantly associated with a lower risk of breast cancer (AOR = 0.58, 95% CI = 0.39–0.86, p < 0.01). These findings suggest that frequent sleep disturbances may be associated with an increased risk of breast cancer, while high physical activity appears to be linked to a lower risk of breast cancer. Further research is needed to explore these relationships and their underlying mechanisms.