Strength work cuts sports injuries by roughly two thirds

Injuries are the great tax on training: they interrupt progress, end seasons and push people out of sport altogether. Warm-up routines and balance drills have long been studied as prevention, but strength training's role as a protective tool, rather than just a performance one, needed a rigorous verdict. This review set out to analyse every randomised trial using strength training as primary prevention of sports injuries and to turn the results into best evidence recommendations. It also asked a dose question: does more strength work mean more protection?

The authors searched four databases up to July 2017 for randomised controlled trials of strength training exercises as primary injury prevention, with two authors independently sorting studies and assessing quality. Six studies qualified, analysing five different interventions with four distinct injury outcomes. Together they included 7738 participants aged 12 to 40, published between 2003 and 2016, five from Europe and one from Africa, who sustained 177 acute or overuse injuries. The analysis included robustness tests, formal checks for publication bias and a post-hoc meta-regression on training dose.

The headline result was a relative risk of 0.338, meaning strength training groups suffered roughly a third of the injuries of comparison groups, and this held across four different acute and overuse injury outcomes. The finding was consistent across robustness tests and the strength of evidence was rated high, with no publication bias detected. The dose analysis found that a 10% increase in strength training volume reduced injury risk by more than four percentage points. The included programmes were also safe, with high compliance rates throughout.

This strengthens the case that resistance work belongs in injury prevention, not just performance programming, and it does so despite considerable differences in populations and interventions across the trials. The dose-dependent pattern, more volume and intensity linked to lower risk, is particularly striking because it suggests the effect is not an artefact of any single programme. The authors identified three characteristically different approaches to prevention mechanisms, folded into contemporary recommendations. What remains open is which specific programmes work best for which sports and ages.

If you play sport and think of lifting as optional accessory work, this is a reason to reconsider: the trials point to strength training as one of the most effective injury protection tools tested. The dose finding suggests protection scales with how much strength work is actually done, and the programmes studied were safe with high compliance. It is informational rather than a prescription, but the direction of the evidence is unusually clear and unusually strong.