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What Causes What
SMOKE− DECREASES

Aerobic exercise → All-cause mortality

Higher Aerobic exercise decreases All-cause mortality.

Martinez-Gomez 2024 pooled 2,011,186 adults in four megacohorts and found that meeting recommended leisure-time activity tracked a 22 percent lower all-cause death rate (hazard ratio 0.78, 0.77 to 0.79). Nobody randomized walking against death.

Observational · Low · N=2011186

The association disappears when you account for other factors, like socioeconomic status or healthy-user bias.

Mechanism

People who walk more also tend to smoke less, earn more, and sit less. Illness can cut activity and raise later death. Martinez-Gomez, Luo, Huang and colleagues (2024) pooled NHIS, UK Biobank, China Kadoorie Biobank, and Mei Jau: 2,011,186 adults, 177,436 deaths, median 11.5 years. Leisure-time activity. Meeting the recommended dose, all-cause hazard ratio 0.78 (0.77 to 0.79). Stronger at older ages. Ekelund, Steene-Johannessen, Brown and colleagues (2016) harmonised 13 cohorts, 1,005,791 people, 84,609 deaths. Versus the most active quartile sitting under 4 hours a day, the least active sitting over 8 hours had hazard ratio 1.59 (1.52 to 1.66). The most active sitting over 8 hours were 1.04 (0.99 to 1.10). The paper is an individual-level meta of cohorts. Zhao, Veeranki, Magnussen, and Xi (2020) followed 479,856 NHIS adults. Recommended aerobic activity only: all-cause 0.71 (0.69 to 0.72). Muscle-strengthening only stays off the claim. Lee, Rezende, Joh and colleagues (2022) followed 116,221 Nurses' Health and Health Professionals adults, 47,596 deaths. Meeting vigorous leisure-time minutes versus none: all-cause 0.81 (0.76 to 0.87). Moderate minutes were 19 to 25 percent lower and mixed in lifting. Chang, Zhu, Liu and colleagues (2024) used UK Biobank and NHANES. Replacing 30 minutes of sitting with walking for pleasure: all-cause 0.965 (0.954-0.977). Feng, Yang, Liang and colleagues (2023) followed 92,139 UK Biobank adults with a wrist accelerometer. More moderate-to-vigorous minutes tracked less all-cause death at any hour. Timing is extra. Stamatakis, Gale, Bauman and colleagues (2020) followed 149,077 in 45 and Up. Among people with no moderate-to-vigorous minutes, sitting over 8 hours versus under 4: all-cause 1.52 (1.13 to 2.03). Meeting the recommendation flattened the slope. Authors name fitness, pressure, and insulin. The files do not isolate a path.

Caveats

The stamp is smoke because nobody randomized walking against death. These are cohorts and one individual-level meta of cohorts. Observation alone cannot close the backdoor, so the stamp stays smoke. More papers of the same design do not settle the claim. Reverse causation sits on the backdoor. Illness cuts activity and raises later death. Healthy-user habits travel with leisure-time walking: income, education, less smoking, less sitting. Residual confounding remains. The aerobic page on this site was built for assigned walking or jogging. These files are self-report leisure-time minutes and wrist accelerometers, not SMILE treadmill sessions. Zhao's NHIS wave sits inside Martinez-Gomez's NHIS pool. Chang and Feng share UK Biobank with that pool. They are not four independent samples. Ekelund, Chang, and Stamatakis are joint with sitting. This page is the activity arrow. Sitting is a different question. Omitted Zhang 2024: diurnal activity and sleep patterns after volume adjustment. Early-morning activity versus midday had hazard ratio 1.36. That is a clock claim, not more activity, less death. This is a journal entry, not medical advice and not a walking prescription.

Effect

qualitative. Martinez-Gomez 2024: meeting recommended leisure-time PA, all-cause HR 0.78 (0.77-0.79), 2,011,186. Sign: more activity, less death. Design does not identify.

Nodes

Lifestyle & environmentAerobic exerciseBiology & endocrinologyAll-cause mortality

Named confounders

Cite this page

What Causes What. “Aerobic exercise → All-cause mortality.” https://whatcauseswhat.org/edges/e-exercise-mortality (atlas updated 2026-09-02).

https://whatcauseswhat.org/edges/e-exercise-mortality

Papers