What Is Running Economy? Why Efficiency Matters More Than VO2max
Learn what running economy measures, what influences it, and how to improve oxygen efficiency for faster race times.
Quick Answer
Running economy (RE) is the amount of oxygen your body uses to maintain a given running speed. A more economical runner uses less oxygen at the same pace, which means they can run faster before reaching their VO2max limit.
Why it matters more than VO2max alone
Two runners with identical VO2max can have very different race performances if one uses oxygen more efficiently. RE explains why some athletes outperform their lab numbers.
RE vs VO2max
VO2max is the ceiling of your aerobic capacity. Running economy is how efficiently you operate below that ceiling. Performance at distances from 5K to marathon depends on both, but RE often differentiates runners with similar VO2max values.
| Metric | What it measures | Typical units | Trainable? |
|---|---|---|---|
| VO2max | Max aerobic capacity | mL/kg/min | Moderately (10-25%) |
| Running economy | Oxygen cost at set pace | mL O2/kg/km or mL O2/kg/min | Yes (5-15% improvement possible) |
| Lactate threshold | % of VO2max sustainable | % VO2max or pace | Yes |
Factors That Influence Running Economy
| Factor | Effect | Modifiable? |
|---|---|---|
| Biomechanics and form | High | Partially |
| Muscle fiber type and stiffness | High | Limited |
| Years of running | High | Yes (gradual) |
| Strength and plyometrics | Moderate | Yes |
| Footwear | Small to moderate | Yes |
| Altitude and heat | Moderate (temporary) | Environmental |
How to Improve Running Economy
High mileage over years
The strongest predictor of RE is years of consistent running. Neuromuscular adaptations reduce oxygen cost per stride over time. This is why elite runners often have exceptional RE despite modest VO2max relative to Olympians.
Strides and short sprints
4-6 x 20-second strides after easy runs, 2-3 times per week, improve neuromuscular coordination without adding significant fatigue. Evidence supports RE improvements from regular sprint work.
Strength and plyometric training
2-3 sessions per week of heavy resistance training and plyometrics (box jumps, bounding) can improve RE by 3-8% in trained runners over 8-12 weeks.
Cadence awareness
Increasing cadence from very low values (under 160 spm) toward 170-180 spm can reduce overstriding and braking forces. Use the Cadence and Stride Calculator to assess your current pattern.
RE and Race Performance
At marathon distance, RE is often the strongest predictor of performance among the three major physiological factors (VO2max, LT, RE). At 5K, VO2max and anaerobic capacity matter more. At 10K and half marathon, all three contribute roughly equally.
Practical takeaway
You cannot measure RE without lab equipment, but you can train the factors that improve it: consistency, strides, strength work, and efficient form.
Related Tools and Guides
Estimate VO2max from race performance and assess cadence patterns to support economy-focused training.
Editorial references
- Running economy: measurement, norms, and determining factors
Barnes, K.R. & Kilding, A.E. (2015). Sports Medicine, 45(8), 1107-1124.
- Factors affecting running economy in trained distance runners
Saunders, P.U. et al. (2004). Sports Medicine, 34(7), 465-485.
- Daniels, J. (2014). Daniels' Running Formula (3rd Edition). Human Kinetics.