For people diagnosed with cancer, the risk of cancer death falls as physical activity rises, according to a new analysis of more than 70 existing studies.
Researchers found the same holds true for everyone - supporting the current World Health Organization recommendation of moderate physical activity to combat the risk of chronic disease, they write in the British Journal of Sports Medicine.
The WHO recommends two and a half hours of moderate exercise per week for some health benefit and five hours of moderate exercise per week for additional benefit. Half as much time per week of vigorous physical activity, like running, may confer the same benefits.
There are no specific recommendations for physical activity levels to combat cancer risk, although more activity has been tied to lower risk of death from breast, colorectal and prostate cancers, the authors note.
"Our results might help to update the recommendation concerning the advisable amount of physical activity to reduce cancer mortality," said senior author Dr. Li Liu of Huazhong University of Science and Technology in China.
Doctors could start to incorporate physical activity into cancer treatments, Liu told Reuters Health by email.
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