Key numbers
less than 1 m/s
Usual-pace speed that marked a higher-risk group (well-functioning older adults, 6-m course)
74.2 years
Mean age of that study's participants
2.20
Rate ratio for persistent lower extremity limitation, below vs above that speed
2.87
Mortality hazard ratio, slowest vs fastest quarter of walking speed (pooled studies)
Where the 1 m/s figure comes from
Cesari and colleagues (2005) used the Health, Aging and Body Composition Study to define cutpoints for usual gait speed in well-functioning older people and to test how well they predicted later health events. Usual walking speed was timed over a 6-m course at the start.
The participants were split at random: 2,031 people to find the cutpoints and 1,016 to check them. Their mean age was 74.2 years.
What walking below that speed meant in that group
People who walked slower than 1 m/s had higher rates of later problems than faster walkers. Over a mean follow-up of 4.9 years, the rate ratio was 2.20 (95% confidence interval 1.76 to 2.74) for persistent lower extremity limitation and 2.29 (1.63 to 3.20) for persistent severe limitation. For hospitalization it was 1.48 (1.02 to 2.13).
Risk rose step by step across the speed groups. The authors concluded that a usual pace below 1 m/s identifies well-functioning older people at high risk of health-related outcomes. That holds for this population, test and course length; it is not a universal definition of slow.
What other evidence adds
An expert panel, the IANA Task Force, reviewed whether usual-pace gait speed could pick out community-dwelling older people at risk, and whether it could stand in for longer assessments. It required gait speed measured over a short distance and outcomes followed over time.
In autonomous, community-dwelling older people, usual-pace gait speed was a consistent risk factor for disability, cognitive impairment, institutionalization, falls and mortality. The panel suggested a usual-pace walk over 4 meters as a quick, safe and reliable measure, while noting that its predictive capacity is still questioned and more specific research is needed.
A meta-analysis by Cooper and colleagues (2010) pooled five studies with 14,692 participants. People in the slowest quarter of walking speed had a summary hazard ratio for mortality of 2.87 (95% confidence interval 2.22 to 3.72) compared with the fastest quarter, after similar adjustments for age, sex and body size. That is an association, not proof that walking slowly causes death.
What this does not show
None of these cutoffs applies to every adult, and none was set for loaded carrying, so they are not validation of the Systematic Farmer's Carry or of any Systematic standard.
The evidence
Each cited source is labeled according to how it supports the particular claim on this page. Direct test evidence, underlying-capacity findings and population reference values are distinguished from Systematic-defined protocols and standards. Historical development notes are retained internally rather than presented as public evidence. A study of an underlying capacity is never presented as validation of the Systematic test itself.
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Underlying-capacity evidence New source
Cesari et al. (2005). Prognostic value of usual gait speed in well-functioning older people--results from the Health, Aging and Body Composition Study. Journal of the American Geriatrics Society.
What it found. In well-functioning older people (mean age 74.2) timed over a 6-m course, a usual pace below 1 m/s marked a group with higher rates of persistent lower extremity limitation and hospitalization.
What it does not show. It does not make 1 m/s a universal definition of slow for all ages or sexes, or a standard for loaded carrying.
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Underlying-capacity evidence New source
Abellan et al. (2009). Gait speed at usual pace as a predictor of adverse outcomes in community-dwelling older people an International Academy on Nutrition and Aging (IANA) Task Force. The journal of nutrition, health & aging.
What it found. In autonomous, community-dwelling older people, usual-pace gait speed over a short distance was a consistent risk factor for disability, cognitive impairment, institutionalization, falls and mortality.
What it does not show. Its predictive capacity is still questioned, and it does not set a universal threshold for slow walking in all adults.
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Underlying-capacity evidence New source
Cooper et al. (2010). Objectively measured physical capability levels and mortality: systematic review and meta-analysis. BMJ (Clinical research ed.).
What it found. Across five studies (14,692 participants), the slowest quarter of walking speed had a summary mortality hazard ratio of 2.87 compared with the fastest quarter.
What it does not show. It does not show that slow walking causes death, and it does not validate a cutoff for any Systematic test.
The Systematic Healthspan Assessment is a physical baseline. It is not a diagnosis, and it does not estimate a biological age, a disease risk or a lifespan.