Maximal strength training improves running economy in distance runners
Seventeen well-trained runners (nine men, eight women) were randomised to add maximal strength training (half-squats, four sets of four repetitions maximum, three times a week for 8 weeks) to their endurance training or to continue endurance training alone.
The strength group improved one-repetition maximum, rate of force development, running economy at 70% of VO2max and time to exhaustion at maximal aerobic speed, with no change in VO2max or body weight. The control group did not change.
Participants
n=17 well-trained long-distance runners (abstract: "Seventeen well-trained (nine male and eight female) runners"), randomly assigned; intervention group four males and four females, the rest controls.
Protocol
Intervention: half-squats, four sets of four repetitions maximum, three times per week for 8 wk, as a supplement to normal endurance training.
Control: normal endurance training for the same period.
Outcomes: 1RM and rate of force development (RFD) in half-squats, VO2max, running economy (RE) at 70% of VO2max, time to exhaustion at maximal aerobic speed (MAS).
Key Results
| Measure (intervention, pre → post) | Change |
|---|---|
| 1RM half-squat | +33.2% |
| Rate of force development | +26.0% |
| Running economy (at 70% VO2max) | +5.0% |
| Time to exhaustion at MAS | +21.3% |
| VO2max | no change |
| Body weight | no change |
Control group: no changes from pre to post in any parameter.
Practical Application
In 17 well-trained distance runners (women and men), adding half-squats (four sets of four repetitions maximum) three times a week for 8 weeks improved running economy by 5.0% and time to exhaustion at maximal aerobic speed by 21.3%, with 1RM up 33.2% and no change in VO2max or body weight; endurance-only controls did not change. To "will heavy lifting help my running without making me heavier?": in this trial, yes — economy at 70% of VO2max and time to exhaustion at maximal aerobic speed improved and body weight did not change.
The dose is heavy and low-repetition (sets of four repetitions maximum), the pattern the base's runner framework uses as its default SYNTH-44.
Inference, not tested here: the time-to-exhaustion gain is a lab endurance test, not a race; the economy gain is the mechanism most likely to carry over to racing.
Limitations
n=17 (four men and four women in the intervention group); short intervention.
Economy measured at one intensity (70% of VO2max); no race or time-trial outcome.
The abstract does not describe blinding or the running training during the study.
Written from the abstract and record metadata only (full text not read).
How this entry was checked and changed
Why this level
parallel RCT, n=17
Content correction 2026-09-27
2026-10-01: independent check against the abstract — wording brought back to what the abstract states.