Overview
A large pooled analysis published in JAMA Network Open found that moderate to vigorous physical activity after a cancer diagnosis was linked with lower risk of dying from cancer for survivors of seven less-studied cancers. The research also suggests people who were inactive before diagnosis can still gain survival benefits by becoming active afterward.
Study design and participants
Researchers combined data from six long-term cohorts: the Cancer Prevention Study-II Nutrition Cohort, the Health Professionals Follow-Up Study, the NIH–AARP Diet and Health Study, the Nurses’ Health Study, the Nurses’ Health Study II, and the Women’s Health Study. The analysis included 17,141 adults who had survived one of these cancers: bladder, endometrial, kidney, lung, oral cavity, ovarian, or rectal.
Participants reported leisure-time physical activity both before and after diagnosis. Post-diagnosis activity was assessed on average 2.8 years after diagnosis to avoid capturing the reduced activity common during active treatment. Activity was categorized by intensity (moderate to vigorous — e.g., brisk walking, running, swimming, cycling) and quantified as MET-hours per week (MET-h/wk). Researchers used current guideline ranges (7.5–15 MET-h/wk, roughly 150–300 minutes of moderate activity per week) to set activity categories. Cancer deaths were followed for nearly 11 years on average.
Analyses adjusted for age, sex, race, smoking, alcohol use, cancer stage, and treatments (including chemotherapy and radiation). The team also examined changes in activity from before to after diagnosis and ran sensitivity analyses excluding deaths within two years of the post-diagnostic activity survey to reduce bias from illness causing inactivity.
Key findings
– Any post-diagnostic moderate to vigorous activity was associated with lower cancer mortality overall.
– Bladder cancer: survivors reporting some post-diagnosis activity had a 33% lower risk of cancer death versus inactive survivors.
– Endometrial cancer: survivors meeting recommended activity levels experienced a 60% lower cancer death risk.
– Lung cancer: meeting recommended activity levels was associated with reductions in cancer mortality of up to 62%.
– Oral and rectal cancers: the greatest benefits appeared at activity levels equal to or exceeding twice current guidelines. Oral cancer survivors exercising >2× guideline levels had a 61% lower risk; rectal cancer survivors saw about a 43% lower risk.
– Kidney cancer: higher activity showed a trend toward benefit but results were not statistically significant.
– Changes in activity: lung and rectal cancer survivors who were inactive before diagnosis but became active afterward experienced notably lower cancer mortality, indicating benefit even when activity begins post-diagnosis.
Practical advice from exercise professionals
– Start slowly and build up; walking is an accessible way to begin. Short “microwalks” (~5 minutes or ~500 steps) can be accumulated over the day.
– Target heart rate estimate: subtract your age from 220, then multiply by 0.7 for moderate intensity or 0.8 for vigorous (example: a 40-year-old’s moderate threshold ≈ 126 bpm).
– Aim for about 150 minutes per week of moderate activity (or 75 minutes of vigorous) and add two days of light strength training as tolerated.
– Monitor pain, fatigue, and other symptoms; consult a physician, physical therapist, or certified trainer if unsure.
– Choose activities you enjoy and consider exercising with friends to improve adherence.
Implications and limitations
These results add to growing evidence that post-diagnostic physical activity may improve survival across multiple cancer types. Because the study is observational, residual confounding is possible, but findings remained consistent after adjustments and sensitivity checks. While more research, including randomized trials where feasible, would strengthen causal inference, encouraging safe, tailored increases in physical activity appears to be a reasonable strategy for many cancer survivors.
