The women who loves early are less exposed develop breast cancer, proposes a new study. British researchers analyzed two data banks that included more than 409,000 women to study the relationship between sleep patterns and breast cancer risk.
Compared to night owls, women who they got up early they had a 40 percent lower risk breast cancer, found a study.
The data also showed that women who slept more than 7 to 8 hours recommended overnight were at a 20 percent higher risk breast cancer for each additional hour they slept.
"We would like to do more work to find out the mechanisms behind these results, because the estimates are based on questions related to mornings or evenings, not when people actually went up earlier or later," said Rebecca Richmond, a researcher at Cancer Research UK at the University of Bristol, Universe Cancer Epidemiology.
"In other words, perhaps changing habits will not change the risk of breast cancer, this can be a more complicated issue," he said.
"However, conclusions about the benefits of morning protection for breast cancer risk in our study are consistent with previous studies …" Richmond noted.
"We also found some evidence of a causal relationship between prolonged sleep and sleeping fragmentation in breast cancer," he added.
The study was presented Tuesday at the National Cancer Research Institute (NCRI)'s Cancer Conference in the United Kingdom, Glasgow, Scotland.
The study did not show a causal relationship between sleep patterns and breast cancer risk.
"These are interesting conclusions that provide more evidence of how our body clock and our natural sleep preferences are involved in the beginning breast cancerCliona Clare Kirwan, member of the NCRI Breast Clinical Research Group, Kirwan was not involved in the investigation.
"We already know that night shift work is associated with poorer mental and physical health, and this study provides more evidence that sleep disorders can play a role in cancerous development," Kirwan said in a statement. meeting fingerprint.
Research submitted at meetings shall be considered provisional when published in a revised journal.