Endurance
Six-minute walk test
The six-minute walk test records the distance a person can walk in six minutes on a flat, measured course. It needs only a corridor, a stopwatch and a chair, and it is sensitive to change across neurological, cardiac and pulmonary rehabilitation — one of the few measures comparable across all three.
What it measures
Functional endurance at a self-selected pace. The patient is told to cover as much ground as possible in six minutes, may slow down or stop to rest, and the total distance is recorded. Because the pace is self-selected, the result reflects what a person can sustain rather than a maximum effort.
Why the course matters more than people expect
A 30-metre straight course is the standard 1. Shorter courses force more turns and each turn costs distance, so a result from a 10-metre corridor cannot be compared with one from 30 metres. We record the course length alongside the distance for exactly this reason.
Encouragement also changes the result, which is why the standardised phrasing is used verbatim rather than improvised.
Key facts
| Abbreviation | 6MWT |
|---|---|
| Score range | Distance walked, in metres |
| Time to administer | About 10 minutes including rest |
| Training required | Standardised instructions must be delivered verbatim |
| Cost | Free |
| Equipment | Flat 30-metre corridor with turn markers · Stopwatch · Chair for rest · Pulse oximeter where indicated · Borg scale for perceived exertion |
| Domains | Functional endurance · Cardiorespiratory capacity · Walking |
| ICF domain | Activity |
| Age range | Child, adult and older adult (reference values differ) |
| Populations | Stroke · Multiple sclerosis · Parkinson's disease · Spinal cord injury · Cardiac · Pulmonary · Older adults |
| Languages | Instructions available in many languages |
Psychometrics by population
The same instrument behaves differently in different conditions. A cut-off established in older adults does not transfer to Parkinson's disease, and a minimal detectable change from one study does not apply to another population.
| Population | Cut-off | MDC / MCID | Reliability | Validity |
|---|---|---|---|---|
| Stroke | — | MDC 34–37 metres; a 50-metre change reported as clinically important (Rehabilitation Measures Database) | Excellent test–retest reliability when instructions are standardised | Correlates with gait speed and community ambulation |
| Pulmonary diseaseValues differ between disease groups — do not transfer a threshold from one population to another | — | MCID 14–30.5 metres across chronic lung disease and other conditions (Bohannon and Crouch 2017) | — | — |
| CardiacDistance is used both to set training intensity and to track change across a programme | — | — | — | — |
Things to be careful about
- Course length and layout change the result; results from different course lengths are not comparable
- Encouragement during the test changes distance — standardised phrasing is required
- Reference equations for predicted distance depend on age, sex, height and weight
Frequently asked questions
What is a normal six-minute walk distance?
There is no single normal figure. Predicted distance is calculated from reference equations that depend on age, sex, height and weight, so the same distance can be excellent for one person and poor for another. What we track is your distance against your own earlier result on the same course.
Why can my distance not be compared with a result from another hospital?
Because course length changes the result. A 30-metre straight course is the standard 1; shorter courses force more turns and every turn costs distance, so a result from a 10-metre corridor is not comparable with one from 30 metres. We record the course length alongside the distance for exactly this reason — if you bring an earlier result, bring the course length with it.
How much improvement in distance is meaningful?
It depends on the condition. After stroke, changes of 34 to 37 metres have been reported as the smallest that exceed measurement error, and a change of 50 metres as clinically important 3. Across chronic lung disease, lung cancer, coronary artery disease and other conditions, a systematic review found clinically important changes of 14 to 30.5 metres 2. These are not interchangeable — a threshold from one population must not be transferred to another.
Can I stop and rest during the test?
Yes. You are asked to cover as much ground as you can in six minutes, and you may slow down or stop to rest whenever you need to. Because the pace is yours to choose, the result reflects what you can sustain rather than a maximum effort — which is the point of the test.
Sources
- ATS statement: guidelines for the six-minute walk test — American Thoracic Society (2002)
- Bohannon RW, Crouch R. Minimal clinically important difference for change in 6-minute walk test distance of adults with pathology: a systematic review — Journal of Evaluation in Clinical Practice (2017)
- Rehabilitation Measures Database — 6 Minute Walk Test record — Shirley Ryan AbilityLab (2021)
Topic
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