Walking Speed: A Useful Mobility Marker

A single number that reflects almost everything

Walking requires the cardiovascular system to deliver oxygen, the nervous system to coordinate the movement, the musculoskeletal system to produce and absorb force, and the balance system to keep you upright. It is not a leg activity; it is a whole-organism activity.

Which is why it turns out that how fast someone habitually walks carries a remarkable amount of information about their overall physiological state. Gait speed has been studied extensively in older adults and shows consistent associations with survival, disability, hospitalisation and cognitive decline.

The measurement problem

Despite being cheap, non-invasive and predictive, walking speed is almost never tracked. When it is measured at all, it is measured once, in a corridor, in a clinic, on a day when the person made an effort to attend an appointment.

That is a poor sample. People walk faster when they know they are being timed. They walk faster in a familiar, well-lit corridor than at home at night. And a single reading tells you nothing about the direction of travel, which is the part that matters.

The trend is the signal

A single gait speed value tells you roughly where someone sits. A gait speed trend tells you what is happening to them. A person whose usual walking speed has declined steadily over six months is telling you something important, even if their current value would still look acceptable on a chart.

Decline is the actionable signal, because decline is often reversible with strength and balance training — and because it typically precedes the falls, the hospital admission, and the loss of independence.

What to do with the information

1. Treat a decline in habitual walking speed as a prompt for assessment rather than a diagnosis.
2. Look for the reversible contributors: new medication, pain, a foot problem, low mood, deconditioning after an illness.
3. Start progressive strength and balance work. This is the intervention with the best evidence for improving gait speed and reducing falls.
4. Recheck. If the trend turns around, it was working.

Measuring it continuously

A sensor at the foot can measure gait during ordinary life rather than only during a supervised test. Mi Terro Care Socks are designed to make a personal gait trend easier to review alongside clinical assessment.