Maximal Aerobic Speed (MAS) — known as VMA (Vitesse Maximale Aérobie) in French — is the lowest running speed at which an athlete reaches their maximum oxygen uptake (VO₂max).
It is the single most actionable metric for endurance runners, PE teachers, and sports conditioning coaches because it allows you to prescribe precise individual training paces (from 70% for recovery up to 120% for HIIT) and predict 5K, 10K, and marathon split times using our online MAS calculator.
Whether you are training for your first half marathon, coaching a soccer squad for pre-season conditioning, or teaching athletics at school, generic pace guidelines often lead to either undertraining or burnout. Understanding your Maximal Aerobic Speed (MAS) solves this by tailoring every workout to your exact cardiovascular ceiling.
1. The Physiology: How MAS Bridges the Gap Between Lab and Track
In sports science laboratories, cardiovascular capacity is typically measured as VO₂max (milliliters of oxygen per kilogram of body weight per minute, ml/kg/min). While VO₂max reflects the size of your physiological "engine," it tells a runner very little about how fast to run on track lane 1 on Tuesday morning.
VO₂max (The Engine)
The maximum rate at which your lungs, heart, and muscles can transport and consume oxygen during exhaustive exercise.
MAS (The Speed)
The running velocity at which that VO₂max is reached. It incorporates both your engine power and your running economy.
Two athletes might have the exact same VO₂max of 55 ml/kg/min, but due to biomechanics, stride efficiency, and tendon elasticity, Runner A reaches that rate at 16.0 km/h (9.9 mph) while Runner B reaches it at 14.5 km/h (9.0 mph). Training by MAS guarantees that both athletes perform intervals at their true relative intensity.
2. How to Test Your MAS: 4 Validated Field Protocols
You don't need a metabolic laboratory cart to determine your MAS. Exercise physiologists have established four reliable field tests:
The 6-Minute Running Test (The Gold Standard)
Run the maximum possible distance over exactly 6 minutes on a measured track. Because human physiology sustains 100% MAS for an average of 6 minutes, the math is straightforward: MAS (km/h) = Distance in meters / 100. Read our detailed French guide on the Demi-Cooper protocol.
The 20-Meter Shuttle Run (Beep Test / Bleep Test)
An incremental back-and-forth test between two cones 20 meters apart, synchronized with audio beeps that increase speed every minute. Developed by Dr. Luc Léger, your final completed stage reflects your maximal aerobic velocity.
The 12-Minute Cooper Test
Dr. Kenneth Cooper's historical test involves running for 12 minutes. At this duration, the average pace represents approximately 90% of MAS, making it ideal for aerobic endurance profiling. Check our 12-minute Cooper test analysis.
The Continuous Track VAMEVAL Test
Conducted on a 400m track with cones placed every 20 meters. Runners increase speed by 0.5 km/h every minute. Widely considered the most accurate continuous incremental test. See our VAMEVAL protocol and stage table.
⏱️ Calculate Your MAS & Track Splits in 2 Clicks
Know your test distance or level? Enter it in our free interactive calculator to receive your precise MAS, VO₂max estimate, 100m/200m/400m lap splits, and race pace targets.
🧮 Open Free MAS Calculator3. MAS Reference Chart: Speeds, Paces & Track Splits
Below is the official reference conversion table matching Maximal Aerobic Speed against kilometer pace, mile pace, 400m lap time, and estimated VO₂max:
| MAS (km/h) | MAS (mph) | Kilometer Pace | Mile Pace | 400m Lap Split | Est. VO₂max |
|---|---|---|---|---|---|
| 10.0 km/h | 6.2 mph | 6:00 min/km | 9:39 min/mi | 2 min 24 s | 35.0 ml/kg/min |
| 11.0 km/h | 6.8 mph | 5:27 min/km | 8:46 min/mi | 2 min 11 s | 38.5 ml/kg/min |
| 12.0 km/h | 7.5 mph | 5:00 min/km | 8:03 min/mi | 2 min 00 s | 42.0 ml/kg/min |
| 13.0 km/h | 8.1 mph | 4:37 min/km | 7:26 min/mi | 1 min 51 s | 45.5 ml/kg/min |
| 14.0 km/h | 8.7 mph | 4:17 min/km | 6:54 min/mi | 1 min 43 s | 49.0 ml/kg/min |
| 15.0 km/h | 9.3 mph | 4:00 min/km | 6:26 min/mi | 1 min 36 s | 52.5 ml/kg/min |
| 16.0 km/h | 9.9 mph | 3:45 min/km | 6:02 min/mi | 1 min 30 s | 56.0 ml/kg/min |
| 17.0 km/h | 10.6 mph | 3:32 min/km | 5:41 min/mi | 1 min 25 s | 59.5 ml/kg/min |
| 18.0 km/h | 11.2 mph | 3:20 min/km | 5:22 min/mi | 1 min 20 s | 63.0 ml/kg/min |
| 20.0 km/h | 12.4 mph | 3:00 min/km | 4:50 min/mi | 1 min 12 s | 70.0 ml/kg/min |
4. How to Structure Interval Training Using % of MAS
Once you know your MAS, you can calibrate any workout with scientific precision. In endurance running and team sports (soccer, rugby, basketball), training intensities are categorized into four distinct zones:
🎯 The 4 Core MAS Training Zones
- Zone 1: Active Recovery (60% – 70% MAS) — Low intensity warm-ups, cool-downs, and recovery runs. Easily conversational.
- Zone 2: Aerobic Threshold / Marathon Pace (75% – 85% MAS) — Builds capillary density, mitochondrial volume, and fat oxidation efficiency.
- Zone 3: Lactate Threshold / 10K Pace (85% – 92% MAS) — The critical velocity before hydrogen ions and lactate rapidly accumulate in the bloodstream.
- Zone 4: VO₂max Intervals (95% – 105% MAS) — Traditional repetitions from 800m to 1,200m designed to expand maximal stroke volume.
- Zone 5: Supramaximal HIIT (110% – 125% MAS) — Short intermittent bouts (e.g. 15s sprint / 15s active rest) to stimulate neuromuscular power and high-speed mechanics. Learn more in our interval pace training tutorial.
Sample HIIT Workout: The 30s / 30s Method
For an athlete with a MAS of 15.0 km/h:
- Target intensity: 100% of MAS = 15.0 km/h (4:00 min/km).
- Distance per 30-second rep: $(15,000\text{ m} / 3600\text{ s}) \times 30\text{ s} = \mathbf{125\text{ meters}}$.
- Workout structure: 2 sets of [8 × (30s run covering 125m / 30s slow jog recovery)] with 3 minutes rest between sets.
5. MAS in Team Sports: The "Eurofit" and Grid Methods
In high-intensity field sports like football (soccer) and rugby, strength and conditioning coaches rarely run players in large unstructured packs. Instead, they organize athletes into MAS Conditioning Grids:
🏉 The Conditioning Grid Method
Players are divided into 3 to 4 speed groups based on their MAS test scores. Cones are positioned at calculated distances so that every group runs for the exact same duration (e.g., 15 seconds) at their individual 110% MAS pace. This ensures fair physiological load across the entire squad — forwards and backs alike.
6. Common Mistakes When Using MAS in Training
❌ Retesting Too Frequently
Aerobic adaptations take 4 to 6 weeks of structured stimuli. Retesting MAS every two weeks creates training fatigue without meaningful data gains.
❌ Confusing MAS with Sprint Speed
MAS is an aerobic threshold, not top sprint speed. An athlete with a 15 km/h MAS might reach 28 km/h in a 30m dash. Do not use MAS for sprint training.
⚠️ Ignoring Running Surface & Weather
Running on grass or wet mud reduces speed by 5% to 10% compared to an all-weather polyurethane track. Adjust your target split times accordingly.
⚠️ Pacing Errors During Testing
Going out at sprint velocity during the first 60 seconds of a 6-minute test will cause severe early acidosis. Emphasize even splits from start to finish.
Frequently Asked Questions (FAQ)
VO₂max measures how much oxygen your body can process per minute (in ml/kg/min). MAS is the actual running velocity (in km/h or mph) where that maximum oxygen consumption occurs. MAS is practical because you can measure it on a track with a stopwatch and use it to set target split times.
A testing cycle every 6 to 8 weeks is standard. This timeframe allows your cardiovascular and mitochondrial adaptations to consolidate before advancing to faster training splits.
Yes! A well-paced 5K run for recreational runners represents approximately 88% to 92% of MAS. If you run 5K in 25:00 (12.0 km/h average), your estimated MAS is roughly 12.0 / 0.90 ≈ 13.3 km/h. You can verify this immediately with our free online calculator.
Absolutely. Beginners often run too fast on easy days and too slow on workout days. Knowing your MAS ensures you stay in Zone 2 (70-75% MAS) on base building days, drastically reducing the risk of shin splints and tendonitis.
🚀 Continue Your Training Optimization:
Deepen your endurance and teaching knowledge with our companion guides and digital tools:
→ Launch Free MAS / VMA Calculator & Pace Generator
→ The 6-Minute Running Test (Demi-Cooper) Field Protocol
→ How to Calculate Interval Workout Speeds and Lap Times
→ AI Physical Education Lesson & Cycle Plan Generator