Key Takeaways
- Running economy (RE) measures how efficiently you use oxygen at a given running speed
- Lower RE values indicate better efficiency - elite runners score 180-200 mL/kg/km
- RE can improve by 2-8% annually with targeted training interventions
- Factors affecting RE include biomechanics, muscle fiber composition, and training history
- Improving RE can enhance performance without increasing VO2max
What Is Running Economy? A Complete Explanation
Running economy (RE) is a physiological measure that quantifies the energy demand of running at a submaximal speed. Specifically, it represents the oxygen consumption (VO2) required to run at a given velocity, typically expressed as milliliters of oxygen per kilogram of body weight per kilometer (mL/kg/km). Simply put, running economy tells you how efficiently your body converts oxygen into forward motion.
Think of running economy like fuel efficiency in a car. Two vehicles might have the same engine capacity (like two runners with the same VO2max), but one uses less fuel to travel the same distance. The runner with better economy expends less energy at any given pace, allowing them to run faster before reaching exhaustion or maintain a given pace with less effort.
Research published in the Journal of Applied Physiology has consistently shown that running economy is one of the three primary determinants of distance running performance, alongside VO2max and lactate threshold. In fact, among runners with similar VO2max values, running economy often becomes the distinguishing factor that separates good runners from great ones.
The Running Economy Formula Explained
RE = VO2 / Speed
The formula calculates how much oxygen you consume to cover a specific distance. When converted to standard units, a VO2 of 45 mL/kg/min at 12 km/h (200 m/min) yields an RE of 225 mL/kg/km. This means your body requires 225 milliliters of oxygen per kilogram of body weight to travel one kilometer at that speed.
Understanding RE Values
| RE Value (mL/kg/km) | Category | Description |
|---|---|---|
| 180-200 | Elite | World-class distance runners, Olympians |
| 200-210 | Excellent | National-level competitive runners |
| 210-220 | Good | Well-trained recreational runners |
| 220-240 | Average | Regular recreational runners |
| 240-260 | Below Average | Novice runners, room for improvement |
| 260+ | Poor | Beginners or inefficient movement patterns |
Factors That Affect Running Economy
Running economy is influenced by a complex interplay of physiological, biomechanical, and environmental factors. Understanding these can help you identify areas for improvement in your own running.
Biomechanical Factors
Stride mechanics play a crucial role in running economy. Optimal stride length and frequency minimize energy waste while maximizing forward propulsion. Over-striding, where the foot lands too far ahead of the center of mass, creates a braking force that wastes energy and increases injury risk.
Ground contact time affects how much elastic energy is stored and returned during each step. Elite runners typically have shorter ground contact times, allowing them to utilize the stretch-shortening cycle of tendons more effectively. This elastic energy return can reduce the metabolic cost of running by up to 50%.
Vertical oscillation (the up-and-down movement during running) should be minimized. Energy spent moving vertically is energy not used for forward motion. Efficient runners appear to glide smoothly rather than bounce.
Physiological Factors
Muscle fiber composition influences running economy. Type I (slow-twitch) muscle fibers are more efficient for endurance activities due to their high mitochondrial density and oxidative capacity. Runners with a higher proportion of slow-twitch fibers typically demonstrate better running economy.
Tendon stiffness affects elastic energy storage. Appropriately stiff tendons (particularly the Achilles tendon) store and release energy more effectively, reducing the muscular work required. Research shows that plyometric training can improve tendon stiffness by 20-30%, directly enhancing running economy.
Body composition matters significantly. Excess body weight, particularly in the extremities, increases the energy cost of running. Studies show that adding just 100 grams to each foot increases oxygen consumption by approximately 1%.
Training History and Adaptations
Years of consistent running training lead to numerous adaptations that improve economy. These include increased mitochondrial density, improved neuromuscular coordination, enhanced fat oxidation capacity, and optimized motor patterns. This is why experienced runners typically have better running economy than novices with similar fitness levels.
Pro Tip: The 10-Year Rule
Research suggests that elite runners often take 8-10 years of dedicated training to fully develop their running economy. Even if you cannot train like a professional, consistent running over years leads to meaningful improvements in efficiency. Patience and persistence are key.
How to Improve Your Running Economy
While some aspects of running economy are genetically determined, research has identified several evidence-based strategies to enhance your efficiency as a runner.
1. Incorporate Interval and Tempo Training
High-intensity interval training (HIIT) and tempo runs improve running economy by enhancing neuromuscular coordination and cardiovascular efficiency. Studies show that runners who include 2-3 quality sessions per week see RE improvements of 3-5% over 6-8 weeks. The body learns to recruit muscle fibers more efficiently and improve oxygen delivery to working muscles.
2. Add Plyometric Exercises
Plyometrics (jump training) improve the stretch-shortening cycle efficiency of muscles and tendons. Exercises like box jumps, bounding, and skipping drills enhance elastic energy storage and return. Research in the European Journal of Applied Physiology found that 6 weeks of plyometric training improved running economy by 4-8% without any increase in VO2max.
3. Include Strength Training
Heavy resistance training, particularly for the lower body, improves running economy by enhancing neuromuscular function and muscle stiffness. Key exercises include squats, deadlifts, lunges, and calf raises. A meta-analysis found that strength training improved running economy by an average of 4.5% when added to endurance training programs.
4. Run More (Volume Matters)
Simply running more miles leads to improved economy through enhanced motor learning and neural adaptations. The body becomes more efficient at the specific task of running. However, increases should be gradual (no more than 10% weekly) to prevent injury.
5. Practice Running at Goal Race Pace
Specificity matters in running economy. Regularly practicing at your goal race pace improves efficiency at that specific speed. This is why marathon-specific training includes substantial time running at marathon pace.
6. Optimize Your Footwear
Lighter shoes improve running economy - each 100 grams of shoe weight reduction improves economy by approximately 1%. Modern carbon-plated racing shoes can improve economy by 4-5% compared to traditional racing flats. However, ensure shoes still provide adequate support for your individual needs.
7. Focus on Running Form
While major form changes should be approached cautiously, subtle improvements can help. Focus on maintaining a slight forward lean from the ankles, landing with your foot beneath your center of mass, keeping arms relaxed with a 90-degree bend, and minimizing unnecessary upper body movement.
Running Economy vs. VO2max: Understanding the Difference
While both metrics are important for endurance performance, they measure fundamentally different things.
VO2max represents your maximum oxygen uptake capacity - the ceiling of your aerobic engine. It indicates how much oxygen your body can deliver and utilize during maximal effort. A higher VO2max provides greater potential for endurance performance.
Running economy determines how efficiently you use that oxygen. You could have an impressive VO2max but poor economy, requiring more oxygen to maintain any given pace than a more efficient runner.
Consider this analogy: VO2max is like the size of your gas tank, while running economy is your miles-per-gallon rating. A car with a smaller tank but better fuel efficiency might actually travel farther than one with a larger tank but poor efficiency.
Research has shown that among elite runners with similar VO2max values (70-85 mL/kg/min), those with better running economy consistently outperform their peers in races. This is why running economy is sometimes called the "secret weapon" of elite endurance performance.
How Running Economy Is Measured
Accurate measurement of running economy requires laboratory testing using indirect calorimetry. The process involves:
- Warm-up: 10-15 minutes of light jogging to achieve physiological steady state
- Incremental test: Running at multiple submaximal speeds (typically 3-5 stages)
- Gas analysis: Wearing a mask connected to a metabolic cart that measures oxygen consumption and carbon dioxide production
- Data collection: Recording VO2 at each speed after reaching steady state (usually 3-4 minutes)
- Calculation: Dividing VO2 by running speed to determine economy at each velocity
While laboratory testing is the gold standard, our calculator provides estimates based on your known values. For precise measurements, consider testing at a sports science laboratory or university exercise physiology department.
The Science Behind Running Economy
Decades of research have established running economy as a critical performance determinant. Landmark studies include:
Daniels et al. (1978) first demonstrated significant RE variations among elite runners, showing that some runners required up to 30% more oxygen than others at the same pace.
Saunders et al. (2004) conducted a comprehensive review identifying the key physiological and biomechanical determinants of RE, establishing the framework for modern understanding.
Barnes and Kilding (2015) performed a meta-analysis showing that strength training, plyometrics, and altitude training are the most effective interventions for improving RE.
Moore et al. (2019) demonstrated that the new carbon-plated "super shoes" improved running economy by 4% compared to traditional racing shoes, sparking ongoing debates about technology in running.
Frequently Asked Questions
A good running economy score for trained recreational runners is 200-220 mL/kg/km. Elite distance runners typically achieve 180-200 mL/kg/km. Lower values indicate better efficiency. Beginners often score 240+ mL/kg/km but can improve significantly with training.
Research shows that running economy can improve by 2-8% per year with targeted training. Interventions like plyometrics, strength training, and increased running volume are most effective. Some elite runners continue to improve their economy even after 10+ years of training.
Yes, running economy varies with speed. Most runners have an optimal speed range where they're most efficient. At very slow speeds, the energy cost per kilometer increases due to inefficient movement patterns. At high speeds approaching VO2max, economy worsens due to metabolic strain. This is why economy is typically measured at submaximal paces.
Both are important, but their relative importance depends on the situation. Among runners with similar VO2max values, running economy becomes the key differentiator. For beginners, improving VO2max often yields faster gains. For experienced runners who have plateaued in VO2max, improving economy offers the best path to continued improvement.
Yes, research has demonstrated that modern carbon-plated racing shoes improve running economy by 4-5% compared to traditional racing flats. The improvement comes from the shoe's ability to store and return elastic energy through the curved carbon plate and responsive foam. This translates to approximately 1-3% faster race times over distances like the marathon.
Body weight significantly impacts running economy. Excess weight, especially in the extremities, increases oxygen cost. Studies show that each 1% reduction in body weight improves running economy by approximately 1%. However, losing too much weight can impair performance and health, so optimal race weight varies by individual.
While precise measurement requires laboratory testing, you can estimate running economy using our calculator if you know your VO2 at different speeds (from previous testing). You can also track indirect indicators like heart rate at given paces - if heart rate decreases at the same pace over time, your economy is likely improving. Some wearable devices now estimate running power, which relates to economy.
Yes, altitude training can improve running economy through several mechanisms including increased red blood cell production, improved oxygen-carrying capacity, and enhanced muscle efficiency. The "live high, train low" protocol has shown the most consistent benefits, with improvements of 1-3% in running economy commonly reported after 3-4 weeks of altitude exposure.