Gait speed
How fast an older adult walks predicts survival across every cohort pooled — about as well as a full panel of clinical variables. A proxy, not a prescription.
goodWell supported, with the usual caveats about effect size.Revised 29 Sept 2026
Four metres of corridor and a stopwatch. Few measurements buy this much information.
Definition
Usual-pace walking speed over a short distance, typically four metres, timed with a stopwatch and expressed in metres per second. No equipment beyond a marked corridor. Fritz and Lusardi’s 2009 white paper proposed it as a sixth vital sign, alongside blood pressure, heart rate, respiratory rate, temperature and pain.
The pooled evidence
Studenski and colleagues pooled individual data from nine cohort studies: 34,485 community-dwelling adults aged 65 and older, followed for six to twenty-one years, with 17,528 deaths recorded. Gait speed was associated with survival in every single cohort. Each additional 0.1 metres per second carried a pooled hazard ratio of 0.88 — survival rose across the full range of speeds, with no threshold below which walking slower stopped mattering.
The striking comparison: predicted survival from age, sex and gait speed alone was as accurate as predictions built on age, sex, chronic conditions, smoking history, blood pressure, body-mass index and hospitalisation history. One stopwatch matched a filing cabinet.
At age 75, predicted ten-year survival stretched from under one in five to nearly nine in ten across the observed range of speeds. That spread is not a treatment effect. It is a summary of everything the body has left.
Why it works
Like grip strength, gait speed is not really measuring what it appears to measure. Walking draws on muscle mass and power, balance, joint integrity, vision, cardiorespiratory fitness, neural control and the absence of pain — so a slow walk is usually the visible end of several quiet declines at once. Fritz and Lusardi’s review catalogues the correlates: hospitalisation risk, falls, disability onset, mortality. The walk is the readout.
What it does not mean
Walking faster on test day does not buy the survival of a fast walker. The same thermometer warning as grip strength applies: practising the four-metre walk raises the number without changing the reserve behind it. Interventions that raise habitual activity — strength work, balance work, treating arthritis, cataracts and breathlessness — move both the number and the thing it stands in for.
Gait speed is a summary, not a lever. You do not fix a summary by editing it; you fix what it summarises.
Using it
As a conversation starter with a clinician, not as a home diagnostic. Speeds are sensitive to corridor length, instructions (“walk comfortably” versus “walk briskly”), footwear and a bad knee week, so single readings wobble and trends matter more than tables. A walking pace that is clearly slowing year on year in your seventies is worth mentioning; a number a tenth below a cut-off found online is not.
What the data do not show
The nine cohorts were collected between 1986 and 2000 and were mostly white and community-dwelling — nursing-home residents and younger adults are outside the frame. No trial has shown that raising gait speed extends life; the association is consistent and graded, but it remains an association. And the “sixth vital sign” label is a proposal from a white paper, not a mandate from any guideline body: most clinics still do not measure it.