A doctor’s office typically has no shortage of instruments for gauging health risk: a blood pressure cuff, a scale, a stethoscope. One of the simplest predictors of a person’s odds of dying from heart disease or any other cause, it turns out, may be a device that looks almost like a toy: a handheld dynamometer that measures nothing more complicated than how hard someone can squeeze.
That finding comes from one of the largest studies ever conducted on the subject, and its central result surprised even the researchers involved. Grip strength, a crude proxy for overall muscular strength, outperformed a measurement doctors have relied on for generations.
A study spanning 17 countries and nearly 140,000 people
The research, known as the Prospective Urban-Rural Epidemiology study, or PURE, followed 139,691 adults aged 35 to 70 across 17 countries with sharply different income levels and healthcare systems, including Canada, Sweden, the United Arab Emirates, Brazil, China, India, Pakistan, and Zimbabwe. Participants were tracked for a median of four years, and each had their grip strength measured with a handgrip dynamometer, a squeeze-and-read device already common in physical therapy clinics. The results were published in The Lancet and summarized by the journal’s publicity office as showing that weak grip strength is linked with shorter survival and a greater risk of heart attack or stroke.
What a five-kilogram drop actually predicts
The study’s central figures are specific enough to be striking. Every five-kilogram decline in grip strength was associated with a 16 percent increase in the risk of death from any cause, a 17 percent increase in cardiovascular death, and a 17 percent increase in non-cardiovascular mortality, covering causes such as cancer. The same decline in grip strength also tracked with more modest but still measurable increases in the risk of a heart attack, up 7 percent, and a stroke, up 9 percent. Crucially, those associations held even after researchers adjusted for other known risk factors, including age, education level, employment status, physical activity, tobacco use, and alcohol consumption, meaning grip strength was not simply standing in for a healthier or wealthier lifestyle.
Beating a measurement doctors have used for a century
The comparison that generated the most attention was against systolic blood pressure, a number nearly every adult has had checked repeatedly throughout their life and one long treated as a cornerstone of cardiovascular risk assessment. According to the study’s lead author, Dr. Darryl Leong of the Population Health Research Institute at McMaster University, grip strength proved to be a stronger predictor of death and cardiovascular disease than systolic blood pressure in this dataset. Leong described grip strength as a potentially easy and inexpensive way to assess an individual’s risk, while cautioning that further research would be needed to determine whether deliberately building muscle strength through exercise could lower that risk, as opposed to grip strength simply reflecting risk that already exists for other reasons.
A possible marker of how the whole body is aging
Part of what makes grip strength useful, researchers suggest, is that it may not be measuring the hand or forearm specifically at all. In a commentary published alongside the study, Professor Avan Aihie Sayer of the University of Southampton and Professor Thomas Kirkwood of Newcastle University argued that grip strength likely functions as a broader marker of underlying aging processes throughout the body, rather than tracking muscle-specific disease. Their reasoning, noted in the same release, was partly a process of elimination: because diseases that affect muscle strength alone are comparatively rare, a population-wide link between weaker grip and higher mortality more plausibly reflects general physiological decline than any single muscular condition.
Why simplicity is the point
Sophisticated cardiovascular risk tools already exist, from imaging scans to blood biomarkers to genetic panels, but most require specialized equipment, trained staff, or a laboratory, resources that remain out of reach for large parts of the world. A handgrip dynamometer costs a small fraction of that infrastructure and takes seconds to administer, which is part of why the PURE study deliberately included lower-income countries in its design rather than restricting the sample to wealthy nations, as much earlier grip-strength research had done. The consistency of the association across such different healthcare settings is what gave researchers confidence the pattern was not an artifact of any one country’s data.
What the finding does not prove
The study establishes an association, not a guaranteed cause-and-effect relationship, and its authors were careful to frame it that way. A weak grip does not doom a given individual, and a strong one is not a guarantee of a long life; the numbers describe population-level risk, not individual destiny. Whether targeted strength training meaningfully lowers a person’s cardiovascular or all-cause mortality risk, rather than grip strength merely reflecting risk shaped by other factors such as underlying illness or frailty, remains an open question the researchers flagged for future study. What the PURE data does establish is that a simple squeeze test, cheap enough to deploy almost anywhere, tracks meaningfully with something as serious as long-term survival.
This article was produced with the assistance of AI and reviewed by an editor.
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