RespiratoryTier 2Topic

Six minute walk test

What it is

A standardised, submaximal exercise test measuring the distance walked in 6 minutes on a flat, hard surface - a simple, reproducible marker of functional exercise capacity
Widely used given its simplicity (no specialised equipment required beyond a measured corridor and a pulse oximeter) compared with formal cardiopulmonary exercise testing

What it reflects

Reflects the integrated function of the cardiovascular, respiratory, and musculoskeletal systems during submaximal exertion - not a test of any single organ system in isolation

Measurements and protocol

Records distance walked, oxygen desaturation (with continuous pulse oximetry), heart rate, and Borg dyspnoea score
Desaturation >=4% or to <88% during the test is a clinically significant finding, often used as a trigger for ambulatory oxygen assessment
A standardised protocol (encouragement phrases, no coaching beyond the standard script) is required for results to be comparable/reproducible over time

Uses

Used to assess baseline functional capacity and monitor response to treatment (pulmonary rehabilitation, disease-modifying therapy in ILD/pulmonary hypertension) and to assess exertional desaturation guiding oxygen prescription

Associations

Pulmonary rehabilitation outcome measure, interstitial lung disease monitoring, pulmonary hypertension severity/prognosis, lung transplant assessment

Meaningful change

A meaningful change in walk distance over time (minimal clinically important difference, commonly cited as ~25-30m) is used to judge whether an intervention (e.g. pulmonary rehabilitation) has produced a clinically relevant benefit, not just a statistically significant one

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