Measure your grip strength baseline with a dynamometer

A handgrip dynamometer measurement gives you the single most practical longevity biomarker you can track at home.

Why it works

You cannot manage what you don’t measure. Grip dynamometers give a standardized, reproducible number that maps directly onto the epidemiological data from studies like PURE. Knowing your grip relative to age- and sex-adjusted norms tells you where you sit on the mortality risk curve — not to cause anxiety, but to make the abstract actionable. The measurement is also sensitive enough to detect decline (or improvement) over months.

How to do it

1. Purchase or borrow a handheld dynamometer (Jamar is the clinical standard; affordable alternatives exist).
2. Sit with elbow at 90 degrees, forearm unsupported. Squeeze maximally for 3 seconds.
3. Record the best of 3 trials on the dominant hand; test the non-dominant hand as well.
4. Compare to age- and sex-based normative data (available from the PURE study supplementary data and publicly accessible grip norm tables).

Evidence

The PURE study (n > 140,000, 17 countries) found every 5 kg decrease in grip strength was associated with a 17 % increase in cardiovascular mortality and 16 % increase in all-cause mortality, stronger than the predictive value of systolic blood pressure. A later meta-analysis by Wu et al. (2017) pooling prospective cohorts confirmed the inverse grip-mortality association beyond the single PURE cohort, and Bohannon (2019) reviewed why grip serves as a broad biomarker for older adults. (observational)

This is observational; grip strength is a proxy for overall health, not an independent causal factor. Improving grip does not automatically translate to reduced mortality — the whole health system matters.

Sources

• Leong et al. (2015), "Prognostic value of grip strength: findings from the Prospective Urban Rural Epidemiology (PURE) study," The Lancet
• Leong DP, Teo KK, Rangarajan S, et al. (2015). "Prognostic value of grip strength: findings from the Prospective Urban Rural Epidemiology (PURE) study." The Lancet, 386(9990):266–273.
• Wu Y, Wang W, Liu T, Zhang D. (2017). "Association of Grip Strength With Risk of All-Cause Mortality, Cardiovascular Diseases, and Cancer in Community-Dwelling Populations: A Meta-analysis of Prospective Cohort Studies." Journal of the American Medical Directors Association, 18(6):551.e17–551.e35.
• Bohannon RW. (2019). "Grip Strength: An Indispensable Biomarker For Older Adults." Clinical Interventions in Aging, 14:1681–1691.
• Sayer AA, Kirkwood TBL. (2015). "Grip strength and mortality: a biomarker of ageing?" The Lancet, 386(9990):226–227.

Common mistake

Comparing to athletes or averages from active populations rather than age-matched norms, which produces false reassurance or false alarm.