Gait Speed

Gait speed has been called a functional vital sign, and the description is fair. It takes under a minute, needs four metres of floor and a stopwatch, and predicts survival, hospitalisation and disability more reliably than most measures requiring far more equipment.^1,2

What it measures

Usual-pace gait speed integrates cardiorespiratory capacity, lower-limb strength and power, balance, joint function, vision, cognition and motivation. That breadth is precisely why it is prognostic: it is a summary measure of the whole system under everyday demand, rather than a measure of one organ.

How it is done

4-metre course — the most widely used in cardiology and geriatrics, and the component of the Short Physical Performance Battery. Mark a 4 m walkway with additional acceleration and deceleration space at each end. Instruct the patient to "walk at your usual comfortable pace" and time the middle 4 m from a standing start with a static start protocol, or use a dynamic start with a 2 m run-up if that is the local convention. Record the better of two trials.

10-metre walk test — the neurological and stroke rehabilitation convention; timing the middle 6 m of a 10 m course removes acceleration and deceleration. Both usual and fast pace may be recorded.

⚠ Protocol matters more than it appears. Static versus dynamic start, usual versus fast pace and course length all shift the number; record which was used, and repeat it exactly.³

Interpretation

• Minimal clinically important difference is approximately 0.05 m/s for a small meaningful change and 0.10 m/s for a substantial one.⁴
• Slow gait speed predicts mortality across a wide range of populations, and improves risk prediction when added to conventional cardiac surgical risk scores.^2,5
• In TAVI and cardiac surgical assessment, gait speed is used formally as a frailty marker informing candidacy.

Why it complements rather than duplicates the walk tests

The 6MWT measures sustained submaximal capacity; gait speed measures habitual short-distance performance. A patient can have a preserved 6MWD and a slow gait speed, or the reverse, and the combination tells you more than either alone. Gait speed is also feasible where a 6MWT is not — in a small room, or where the patient cannot sustain six minutes.

Prescribing exercise from the result

Gait speed is a screening and stratifying measure rather than a direct prescription tool, but it steers the programme — see prescribing exercise from test results:

• <0.8 m/s — prioritise lower-limb strength, power and balance before endurance volume; consider supervised delivery and falls assessment.
• 0.8–1.0 m/s — combined strength and aerobic programme, progressing volume as tolerated.
• >1.0 m/s — endurance and intensity are the limiting factors; prescribe from a walk test or CPET rather than from gait speed.

Cautions

Ensure a clear, uncluttered walkway and appropriate footwear; permit usual walking aids and record which was used, since changing the aid invalidates comparison. Guard patients with balance impairment. The test is low-intensity and rarely provokes symptoms, but standard stopping criteria apply.

References & evidence base

1. Studenski S, Perera S, Patel K, et al. Gait speed and survival in older adults. JAMA 2011;305(1):50–58.
2. Afilalo J, Eisenberg MJ, Morin JF, et al. Gait speed as an incremental predictor of mortality and major morbidity in elderly patients undergoing cardiac surgery. J Am Coll Cardiol 2010;56(20):1668–1676.
3. Peters DM, Fritz SL, Krotish DE. Assessing the reliability and validity of a shorter walk test compared with the 10-metre walk test. J Geriatr Phys Ther 2013;36(1):24–30.
4. Perera S, Mody SH, Woodman RC, Studenski SA. Meaningful change and responsiveness in common physical performance measures in older adults. J Am Geriatr Soc 2006;54(5):743–749.
5. Abellan van Kan G, Rolland Y, Andrieu S, et al. Gait speed at usual pace as a predictor of adverse outcomes in community-dwelling older people. J Nutr Health Aging 2009;13(10):881–889.
6. Fried LP, Tangen CM, Walston J, et al. Frailty in older adults: evidence for a phenotype. J Gerontol A Biol Sci Med Sci 2001;56(3):M146–M156.

References are numbered in citation order (Vancouver/BMJ style) and were current at the time of writing. Guidelines are living documents — verify against the latest version before clinical use.