Randomized 10-week trial: strength + plyometrics cut 90‑min running fatigue
- Loughborough University researchers reported a 10-week randomized trial in well-trained male runners showing added strength-plus-plyometric work reduced late-run fatigue versus running alone. - The biggest number was time-to-exhaustion after a 90-minute run: the training group rose from 247 to 324 seconds, while controls barely moved. - That matters because marathon fatigue is a durability problem, and newer reviews already suggest heavier strength work beats plyometrics alone.
Distance running got a useful reminder this year — fatigue resistance is trainable, and not just with more miles. A randomized trial from Loughborough University tested whether adding strength and plyometric work to normal run training could keep runners more economical deep into a long effort, when form usually starts to leak and oxygen cost creeps up. That is the real gap here. Plenty of studies measure running economy when athletes are fresh. Races are not run fresh. This one pushed runners through 90 minutes first, then checked what was left. (fisiologiadelejercicio.com) ### What did the researchers actually do? They took 28 well-trained male runners and split them into two groups for 10 weeks. One group kept doing habitual run training. The other kept the same running but added two weekly gym sessions built around maximal strength and plyometric work. The paper describes this as a randomized controlled trial, and the runners were already reasonably trained — average VO2max was 58.6 ml/kg/min and average 10 km time was about 39 minutes. (fisiologiadelejercicio.com) ### Why test fatigue after 90 minutes? Because that is where a lot of endurance performance falls apart. A runner can look efficient early, then get progressively more expensive as muscles lose stiffness, force output drops, and each stride costs more oxygen. The study had participants run 90 minutes at a heavy but sustainable inten(fisiologiadelejercicio.com)fresh-state lab picture is enough. (fisiologiadelejercicio.com) ### What changed? The added strength group improved running-economy durability late in the run. In plain English, they held onto efficiency better as fatigue built. They also improved post-run time to exhaustion, rising from 247 seconds before the intervention to 324 seconds after it. That is a big jump for a 10-week add-on block. The running-only control group did not get the same payoff. (fisiologiadelejercicio.com) ### What was in the gym work? This is the part runners usually want to know first. The intervention combined maximal strength and plyometric training twice per week. The broader literature points to high-load work — usually 80% or more of 1RM — as especially useful for improving economy and performance in middle- and long-distance runners, and this trial fits that direction rather than arguing for endless light “runner strength” circuits. (fisiologiadelejercicio.com) ### Why would lifting help a runner who already runs a lot? Basically, stronger legs can produce the same running force with a smaller fraction of their max capacity. That changes the feel of late-race running. Each stride becomes less of a near-limit effort. The spring in the lower leg also matters — especially around the ankle and(fisiologiadelejercicio.com)ance training improved running economy, and calf-raise strength changes tracked with economy changes. (pubmed.ncbi.nlm.nih.gov) ### Is strength better than plyometrics? Not always, but the trend is leaning that way for endurance runners. A 2022 systematic review and meta-analysis found heavy resistance training produced a larger pooled effect on running economy than plyometric training alone. A 2024 review went further and argued that high-load training, plus some combined methods, seems especially effective for performance outcomes like time trial and t(pubmed.ncbi.nlm.nih.gov)not as a weird outlier. (pmc.ncbi.nlm.nih.gov) ### What is the catch? The sample was small, all male, and already well trained. So you should not assume the exact numbers carry over to women, beginners, or elite marathoners. And the intervention was combined strength plus plyometrics, which means it cannot cleanly tell you how much of the gain came from heavy lifting versus jumping. (fisiologiadelejercicio.com)pdf)) ### Bottom line? If you care about the last third of a race, this study points away from “just run more” and toward a smarter mix — two serious strength sessions a week may help you stay economical when the fatigue bill comes due. (fisiologiadelejercicio.com)
