Stair climbing tracked 39% fewer heart disease deaths across 480,479 people

Sophie Paddock, a cardiology registrar in Norwich, has spent a while on a question most cardiologists would consider beneath their specialty: whether it matters that you took the lift.

She and colleagues at the University of East Anglia ran a search that yielded 1873 studies, out of which nine studies with 480,479 patients were included. Frequent stair climbers were 39% less likely to die from heart-related causes and 24% less likely to die from any cause compared with people who climbed stairs less often.

“After pooling results from over 450,000 participants, we found a consistent association between stair climbing and lower risk of both cardiovascular death and overall mortality,” Paddock says.

Read her sentence again and notice the word she chose. Association.

Why nobody has run the stair-climbing trial you want

To prove stairs save lives you would need to take several thousand people, assign half of them to climb stairs for a decade or two, stop the other half from doing so, and then count the funerals. Nobody has done that and nobody will.

So the reviewers took what exists. “Randomised controlled trials or observational studies including stair climbing as a variable were included”, and the mortality evidence that produced the headline comes from the second kind: large groups of people, asked at some point how much they use the stairs, then followed for years to see who dies. The release puts the follow-up at a median of 14 years, across ages 35 to 84.

That design can measure whether stair climbers die less. It cannot tell you why.

The confound sitting on the stairs

Think about who takes the stairs, and the problem arrives on its own.

Stairs are taken by people whose knees work, whose lungs keep up, who are not carrying an extra thirty kilos, who live and work in buildings where the stairwell is not a fire escape that smells of bins. Stairs are avoided by people with angina, with early heart failure, with arthritis, with the particular breathlessness that a person explains to themselves as getting older.

Now run that forward fourteen years and count deaths in both groups. You will find exactly what this paper found, whether or not the staircase did a single thing.

The sharpest version of the problem is reverse causation. Undiagnosed heart disease changes behavior before it kills anyone: the shortness of breath comes first, the decision to wait for the lift comes second, and the death certificate arrives years later. The habit did not fail to protect the person. The disease reached the habit first.

The researchers chose their words carefully. The review was registered on PROSPERO, the public register for review protocols, before any of it began. The problem is not their work. It is how a number like 39% travels once it leaves the paper.

What the pooled stair-climbing numbers say

The heart result rests on the pooled analysis of five studies and 455,619 patients, which found stair climbing associated with a significant reduction in cardiovascular mortality. Stair climbing was also associated with a significant reduction in all-cause mortality, about a quarter lower.

Illness followed the same pattern. Morbidity was also associated with stair climbing, covering heart attack, ischaemic stroke and heart failure.

Consistency across nine separate populations is worth something. It is the kind of consistency you would expect if stairs helped, and also the kind you would expect if fitness, income, housing and undiagnosed illness all travel together, which they do.

The case for stairs that does not depend on this study

Vassilios Vassiliou, professor at the University of East Anglia’s Norwich Medical School, makes an argument that survives the caveats intact.

“Cardiovascular disease is the leading cause of death worldwide, with cases nearly doubling between 1990 and 2019,” he says. “But it is largely preventable through a healthy lifestyle, including regular physical activity, a heart-healthy diet, not smoking, maintaining a healthy weight, and managing blood pressure, cholesterol, and diabetes.”

Climbing a flight of stairs is vigorous activity, briefly. It raises your heart rate more than walking on the flat, it costs nothing, it needs no kit, no membership and no travel time, and the equipment is already installed in most of the buildings you enter. Paddock’s framing is the practical one: “Unlike going to the gym or doing a workout, climbing the stairs is something you can easily fit into your day at home, at work or when you’re out. It’s a good option for people who don’t have much time or easy access to exercise.”

That case rests on what vigorous activity does to a body, which is well established, rather than on this meta-analysis, which cannot carry it.

What is missing from the stair-climbing case

The review inherits every weakness of the studies inside it. Stair climbing was self-reported in these cohorts, measured once, and treated as though it described the following decade. How many flights, how fast, and how often are not standardized across nine studies from different countries and eras.

Some of the included work was randomized, but the mortality pooling was not, and the paper does not claim otherwise. The word in the conclusion is “associated”.

The authors are also careful about what they are recommending. Their pitch is population-level: encouraging people to take the stairs in workplaces, public buildings and homes could form part of a wider strategy to reduce cardiovascular disease. A building policy is a different thing from a personal prescription, and it is a reasonable thing to argue for on evidence this shape.

So take the stairs. Do it because two flights leave you slightly out of breath and that is the point, not because a headline promised you 39%. And keep it in proportion: your risk depends on many factors, some of which are changeable and others that are not, and no staircase outruns an unmanaged blood pressure.