Walking and heart disease has some of the strongest evidence of any claim about walking. It is also mostly observational, and some of the numbers that circulate online don't survive a check against the studies they come from. Here is what the main sources found.
Heart disease risk: the big cohorts
| Study | Who | Finding |
|---|---|---|
| Manson et al., NEJM 1999 | 72,488 US nurses aged 40 to 65 | Women walking the equivalent of 3 or more hours a week at a brisk pace had 35% lower risk of coronary events than those who walked infrequently (relative risk 0.65, 95% CI 0.47 to 0.91) |
| Manson et al., NEJM 2002 | 73,743 postmenopausal women aged 50 to 79, followed for about 3 years | Total cardiovascular risk fell across walking groups (relative risks 0.88, 0.70, 0.66, 0.58 vs the least active); at least 2.5 hours a week of walking or vigorous exercise went with about 30% lower risk |
| Hamer and Chida, 2008 | 18 cohort studies, 459,833 people free of heart disease at the start | Highest vs lowest walking: 31% lower cardiovascular risk and 32% lower all-cause mortality |
| Ding et al., Lancet Public Health 2025 | 57 studies of device-measured steps | About 7,000 vs 2,000 steps a day: 25% lower risk of new cardiovascular disease |
Two caveats stand out. The two largest US studies were of women only. And all of these compare people who walk a lot with people who walk little, who may differ in many other ways. The researchers adjust for what they can measure, but healthier people walk more to begin with.
A 2009 dose-response meta-analysis (Zheng and colleagues) found that coronary heart disease risk falls as walking dose rises. A later review summarising it puts about 30 minutes of normal walking, five days a week, at roughly 19% lower risk. In the step-count review in the table, risk kept falling until around 7,000 steps a day, and for cardiovascular mortality it flattened there, though the authors rated that evidence as lower certainty. For the step-count picture in full, see how many steps a day you need.
Blood pressure: what trials show
Trials can answer a narrower question than cohorts: does starting to walk change a measurable risk factor? An updated meta-analysis of randomised trials in previously inactive, apparently healthy adults (Murtagh and colleagues, 2015) found that walking programs lowered systolic blood pressure by about 3.6 mmHg (95% CI 2.0 to 5.2) across 16 trials, lowered diastolic pressure by about 2%, and improved aerobic fitness by about 10%.
A separate review of walking groups (Hanson and Jones, 42 studies and 1,843 participants) found similar drops, 3.7 mmHg systolic and 3.1 mmHg diastolic, plus a lower resting heart rate by about 3 beats a minute. That is a modest change. It is useful, and it adds up with other changes, but it is not a substitute for treatment. If you take blood pressure medication, do not change it on the strength of walking without talking to your doctor.
The runners-and-walkers study from Williams and Thompson found that walkers and runners who spent equal energy had similar reductions in risk of new high blood pressure, which is covered in walking vs running.
Does pace matter?
The evidence is mixed. In the Hamer and Chida meta-analysis, walking pace predicted risk more strongly than walking volume (48% vs 26% lower risk), and in the 2002 women's study a brisker pace also went with lower risk. But the two big step-count studies, in older women and in US adults, found that stepping intensity was no longer linked to mortality once total steps were counted; we cover that in the 4,400 steps study. Our reading: volume clearly matters, and pace may add something, but nobody has pinned down how much. Our walking pace chart shows what a brisk 3.5 to 4 mph looks like.
How much?
Health guidelines recommend at least 150 minutes a week of moderate-intensity activity such as brisk walking. In the 2002 women's study, 2.5 hours a week, which is 150 minutes, was where roughly 30% lower risk appeared. At about 100 steps a minute, 150 minutes is around 15,000 brisk steps a week.
What we left out
You'll often see walking credited with raising HDL cholesterol by 5 to 10%, lowering inflammation markers, and reducing arterial stiffness. The walking-groups review found a small fall in total cholesterol (0.11 mmol/L) and unclear effects on HDL and other blood fats. We haven't verified the claims about inflammation or arterial stiffness against trials, so we are not making them here.
If you already have heart disease
Supervised exercise, often including walking, is a standard part of cardiac rehabilitation. If you have a heart condition, or risk factors such as high blood pressure or diabetes, talk to your doctor or rehabilitation team before changing how much you do, and ask what intensity is right for you. Stop and get urgent medical help if you have chest pain or pressure, severe breathlessness, fainting or dizziness, or an irregular heartbeat while walking.
Sources
- Manson JE, Hu FB, Rich-Edwards JW, et al. A prospective study of walking as compared with vigorous exercise in the prevention of coronary heart disease in women. New England Journal of Medicine. 1999;341(9):650-658. PubMed
- Manson JE, Greenland P, LaCroix AZ, et al. Walking compared with vigorous exercise for the prevention of cardiovascular events in women. New England Journal of Medicine. 2002;347:716-725. nejm.org
- Hamer M, Chida Y. Walking and primary prevention: a meta-analysis of prospective cohort studies. British Journal of Sports Medicine. 2008;42(4):238-243. PubMed
- Zheng H, Orsini N, Amin J, Wolk A, Nguyen VT, Ehrlich F. Quantifying the dose-response of walking in reducing coronary heart disease risk: meta-analysis. European Journal of Epidemiology. 2009;24:181-192. springer.com
- Ding D, Nguyen B, Nau T, et al. Daily steps and health outcomes in adults: a systematic review and dose-response meta-analysis. The Lancet Public Health. 2025;10(8):e668-e681. thelancet.com
- Murtagh EM, Nichols L, Mohammed MA, Holder R, Nevill AM, Murphy MH. The effect of walking on risk factors for cardiovascular disease: an updated systematic review and meta-analysis of randomised control trials. Preventive Medicine. 2015. sciencedirect.com
- Hanson S, Jones A. Is there evidence that walking groups have health benefits? A systematic review and meta-analysis. British Journal of Sports Medicine. 2015. PubMed
- Williams PT, Thompson PD. Walking versus running for hypertension, cholesterol, and diabetes mellitus risk reduction. Arteriosclerosis, Thrombosis, and Vascular Biology. 2013;33(5):1085-1091. PMC
Correction note: an earlier version of this page called the evidence "overwhelming," cited an unnamed study of over 70,000 people (which appears to be the 1999 nurses study above, where the figure for the most active walkers was 35%), gave 35% lower stroke risk and a 4 to 11 mmHg blood pressure fall "comparable to medication," said walking raises HDL by 5 to 10% and lowers inflammation, and included a step-threshold table with a "20% brisk pace bonus." We could not trace those figures to sources, so the numbers above replace them. We checked the figures against published abstracts and summaries on October 2, 2026, and did not read the full text of the Murtagh or Hanson reviews. This is general information, not medical advice.