Resistance training cut CRP in older adults

Ageing is accompanied by chronic low-grade inflammation, a persistent low-level elevation of markers such as C-reactive protein, IL-6 and TNF-α. The authors note this pattern is associated with adverse health outcomes and may exacerbate the severity of infectious disease such as COVID-19. Resistance training is frequently proposed as a countermeasure, but individual trials in older adults have been small and their results inconclusive. Pooling those trials is the way to test whether lifting reliably shifts inflammatory markers, and whether the answer depends on how the training is programmed.

The reviewers searched seven databases, including MEDLINE, EMBASE, the Cochrane Library and CINAHL, for randomised controlled trials of resistance training in people aged 60 years and over. Eligible trials had to report C-reactive protein, interleukin-6, interleukin-10 or tumour necrosis factor alpha. Eighteen randomised controlled trials with 539 participants were included, and effects were combined using fixed or random-effects models. Subgroup analyses examined age, health status, training method, number of exercises, intensity, weekly frequency and programme duration.

Resistance training reduced C-reactive protein, with an effect size of -0.72 (95% CI -1.06 to -0.38, p < 0.001), the clearest result in the analysis. TNF-α also fell (-0.56, -1.08 to -0.03, p = 0.04), as did IL-10 (-3.34, -6.16 to -0.53, p = 0.02). IL-6 only tended to decrease (-0.59, -1.18 to 0.00, p = 0.05), with the confidence interval touching zero. Subgroup analyses showed the CRP reduction appeared regardless of age, training method, number of exercises, intensity, weekly frequency or duration.

This strengthens the case that resistance training does something measurable to the inflammatory profile of older adults, which previous single trials had left unresolved. The consistency of the CRP finding across subgroups suggests the effect is not confined to one style of programming. But the fall in IL-10, an anti-inflammatory cytokine, does not fit a simple less-inflammation narrative and the review does not resolve it. Open questions include whether these marker changes translate into fewer illnesses, better function or longer healthspan, and how long the changes persist once training stops.

If you are in your sixties or beyond, this is a reason to think resistance training influences more than muscle and strength — it appears to nudge the inflammatory markers that track with ageing. The consistency across intensities, frequencies and programme lengths suggests no exotic protocol is required for the CRP signal to show up. It is worth keeping expectations proportionate: these are blood measurements, not proof of fewer diseases or longer life. Treat it as one more line of support for lifting being a general-health intervention, not just a physique one.