Grip strength scaled to body weight predicted both who develops venous thromboembolism and who dies after it. Across 481,945 UK Biobank adults followed a median 13.7 years, each 1-SD increase in relative grip strength cut incident VTE risk by 13% (HR 0.87), and the top tertile had 19% lower risk than the bottom (HR 0.81). The pattern held across genetic risk strata. Among 14,908 people already living with VTE, each SD increase meant 14% lower all-cause mortality, with a 21% reduction in the highest tertile.
Grip strength has now been linked to cardiovascular disease, dementia, and total mortality, so a VTE association fits an established pattern. Its value here is as a cheap, standardised marker of physical reserve, and the persistence across genetic risk tiers suggests behaviour-linked fitness matters even for people with inherited clotting tendencies. Plausible mechanisms include less adiposity and inflammation, better venous return from active calf and leg muscle, and higher overall activity. The caveats are significant. This is observational, and reverse causation is likely: early illness, frailty, or undiagnosed disease lowers grip strength and also raises clotting risk. Relative grip strength partly reflects body composition, so confounding by lean-versus-fat mass is hard to exclude. UK Biobank skews healthier and predominantly white, and a single baseline measurement cannot show whether improving strength lowers risk. No trial has tested that. Treat this as confirmatory evidence that resistance training and maintaining muscle are sensible, but not as proof that strength-building prevents clots.
