Grip strength as a longevity marker, and how to test it at home

Grip strength has become a popular “longevity number”, helped along by headlines saying it predicts how long you will live. For people who spend their days on a keyboard, it has an obvious appeal: it is quick, cheap to measure, and hints at something typing does not train.

The core claim is well supported. In very large studies, people with weaker grip are more likely to die earlier and to develop several chronic diseases. What that evidence does not show is that squeezing a grip trainer will change your risk. Grip strength is best understood as a window onto overall strength and health, not as a target in itself.

Why a handshake became a health marker

Grip strength is measured by squeezing a handheld dynamometer as hard as you can. It is widely used in research and clinical practice as a simple stand-in for overall muscle strength, which declines with age, inactivity and illness.

That makes it useful to researchers who want a fast, cheap measure they can use on tens of thousands of people. It also means grip strength picks up much more than the strength of your forearms.

What the big studies show

The best-known study is PURE, which measured grip strength in adults across many countries of varying incomes and followed them for deaths and disease. Grip strength was inversely associated with death from any cause, with a hazard ratio for every 5kg decrease in grip strength of 1.16. In other words, each 5kg of lower grip went with a higher risk of death over follow-up, after adjusting for other factors.

UK Biobank, one of the largest cohorts in the world, found similar patterns for death and for cardiovascular and respiratory disease and several cancers. It also gave practical thresholds. Muscle weakness, defined as grip strength <26 kg for men and <16 kg for women, was associated with a higher risk across most of the outcomes studied.

These are consistent findings from large, diverse populations. As markers go, grip strength is a strong one.

Marker, not lever

The key limitation is causation. Grip strength is associated with earlier death, but that does not mean weak hands cause it.

– Illness lowers strength. People with undiagnosed disease, frailty or poor nutrition tend to be weaker, so part of the link reflects existing ill health. – Grip reflects the whole body. Strong grip usually comes with more muscle overall, more physical activity and better general fitness. – Trials are missing. The PURE authors themselves said further research is needed to test whether improvement in strength reduces mortality and cardiovascular disease.

So a low reading is a sensible prompt to look at your overall activity and health, while a high reading is not a guarantee of anything. Training only your grip is unlikely to capture whatever underlies the association.

How to test it at home

You need a hand dynamometer. Research tends to use the Jamar hydraulic model, which is expensive, but cheaper digital models exist. A validation study of one low-cost option in a large group of older adults concluded that the CAMRY EH101 dynamometer provides excellent reliability and validity compared with the Jamar.

Method matters. A review of how grip strength is measured found there is considerable variation in current methods of assessing grip strength, which makes results hard to compare. To get readings you can compare over time:

– Sit in the same chair, in the same posture, each time. – Keep your arm in the same position, typically with the elbow bent and the forearm supported or by your side. – Squeeze as hard as you can for a few seconds, rest, and repeat, recording your best effort for each hand. – Test at a similar time of day, and not straight after hard training.

Compare your best result with the UK Biobank weakness thresholds as a rough guide, bearing in mind that normal values also vary with age, sex and body size.

What this means for desk workers

Typing and mouse use do not build meaningful grip strength, and long sedentary days do little for muscle generally. The most sensible response to a low or declining reading is not a grip gadget but a broader strength habit: regular resistance training for the whole body, plus general physical activity.

If your grip is well below the thresholds, has dropped noticeably, or comes with unexplained weight loss, fatigue or weakness, it is worth mentioning to a GP rather than just training harder.

Common questions

What is a good grip strength?

It depends on age, sex and body size, so there is no single target. As a rough floor, UK Biobank researchers defined weakness as grip strength under 26 kg for men and under 16 kg for women, which was linked to higher risk of poor health outcomes.

How do I test grip strength at home?

Use a hand dynamometer, keep your posture and arm position the same every time, and record your best of several maximal squeezes with each hand. Low-cost digital dynamometers have been shown to give reliable results compared with the laboratory standard.

Can improving grip strength help you live longer?

That has not been shown. Grip strength strongly predicts mortality, but the researchers behind the largest studies say trials are needed to test whether improving strength reduces deaths, and much of the link likely reflects overall health.

Do grip trainers improve your health?

No evidence reviewed here shows that grip trainers change health outcomes. If your grip is low, whole-body strength training and more physical activity address the likely underlying causes better than training your hands alone.

The bottom line

Grip strength is one of the simplest, best-supported markers of long-term health, and you can measure it reliably at home for the price of a basic dynamometer. Treat it as a useful gauge rather than a goal: if it is low or falling, the answer is more overall strength and activity, and a conversation with a doctor if something else seems wrong.