Strength Training Improves Running Economy Durability and Fatigued High-Intensity Performance in Well-Trained Male Runners: A Randomized Control Trial.

Distance runners often talk about how much a race hurts in the final stretch, when fatigue erodes efficiency and the legs no longer respond the way they did fresh. This trial asked whether adding strength training to normal running training could protect running economy, meaning how much oxygen a runner uses at a given pace, as fatigue builds during a long run, and whether it helps performance when things get hard at the end. Twenty-eight well-trained male runners were split into a running-only group and a group that added twice-weekly maximal strength and plyometric training for ten weeks.

Both groups ran for ninety minutes at a demanding but sustainable pace, then ran to exhaustion at high intensity. The strength-training group's running economy held up better across the ninety minutes and their time to exhaustion afterward improved substantially, while the running-only group's economy and fatigued performance did not improve or got worse. The main limitation is that this was a small trial in well-trained men, so it is unclear how these findings generalize to other runners.

If you're a runner, you probably know that feeling of your form breaking down late in a long run, even before your legs quit entirely. This study looked at whether adding strength training, specifically heavy resistance exercises and jump-based plyometric training, to regular running could help runners stay efficient for longer and perform better when fatigued. Twenty-eight well-trained male runners were divided into two groups over ten weeks: one kept training as usual, and the other added strength sessions twice a week.

Both groups then completed a ninety-minute run followed by a run to exhaustion. The runners who added strength training kept their running efficiency more stable throughout the ninety minutes, and afterward they were able to keep running much longer before giving up, compared to the running-only group, whose efficiency and fatigued performance did not improve. These results come from a fairly small study of well-trained men, so we can't be sure the same pattern would hold for women, less experienced runners, or over longer training periods.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This randomized controlled trial compared a habitual running-only group (n=14) against a group adding twice-weekly maximal strength and plyometric training for ten weeks (n=14) in well-trained male runners (VO2max 58.6 mL·kg⁻¹·min⁻¹). Outcomes were running economy across a ninety-minute run in the heavy-intensity domain and subsequent time to exhaustion at 95% of pre-test VO2max. A significant group-by-time interaction was found for running economy (P=0.003, ηp²=0.13), with the strength-training group improving oxygen cost by 2.1% at 90 minutes versus a 0.6% worsening in controls (P=0.04 between groups).

Time to exhaustion showed a large interaction effect (P=0.004, ηp²=0.28), increasing 35% in the strength-training group versus decreasing 8% in controls. These are clear between-group differences favoring the addition of strength training, though the sample size is modest and the cohort was restricted to well-trained men, limiting generalizability to other populations or training durations.

The design allows a causal interpretation of the between-group effect, but replication in larger and more diverse samples would strengthen confidence in the magnitude and durability of these effects.