Anaerobic Fitness: 45 Second Run

The 45-Second Run Test records the distance an athlete covers in 45 seconds at maximal effort. MAT describes it as an anaerobic capacity test scored by distance covered, while Topend Sports describes it as a speed endurance test commonly used by track coaches for 400 m and 800 m runners.  

Direct peer-reviewed validation evidence for the exact 45-second field test is limited. The best supporting evidence comes from related research on sprint running, anaerobic speed reserve, maximal sprint speed and 400 m performance modelling.  

Introduction

The 45-Second Run Test is a simple field assessment for high-intensity running endurance. Because the athlete runs maximally for a fixed duration, the score is distance covered rather than time.

It is most relevant for sports where athletes must sustain high-speed running beyond a short acceleration phase, including 400 m running, 800 m running and field sports requiring repeated high-intensity efforts.

Quick Summary

Test name: 45-Second Run Test
Category: Speed endurance / anaerobic running capacity
Primary score: Distance covered in 45 seconds
Best suited to: 400 m runners, 800 m runners, field sport athletes and speed-endurance monitoring
Key limitation: Exact distance measurement can be difficult without clear track marking, GPS or video review.

What Is the Assessment?

The athlete runs as far as possible in 45 seconds. The total distance covered is recorded. MAT’s support content describes the 45-second run as a fixed-time anaerobic capacity test where greater distance indicates better performance.  

The test is often used as a practical speed-endurance measure rather than a laboratory anaerobic capacity test.

Why It Is Used

The 45-Second Run Test may be used to assess:

• Speed endurance
• Anaerobic running capacity
• Ability to maintain high-speed running
• 400 m and 800 m performance context
• Baseline and retest change
• Conditioning progress
• Field-based high-intensity running tolerance

What It Measures

The test may reflect:

• Distance covered under maximal 45-second effort
• Speed endurance
• Anaerobic glycolytic contribution
• Pacing and effort distribution
• Running economy at high speed
• Fatigue tolerance
• 400 m performance context

It does not directly measure VO₂max, lactate threshold, maximal sprint speed or laboratory anaerobic capacity.

Who It Is Used For

The test may be useful for:

• 400 m runners
• 800 m runners
• Field sport athletes
• Court sport athletes
• Runners completing speed-endurance monitoring
• Coaches tracking high-intensity running performance

It may not be appropriate for inexperienced runners or clients who cannot safely perform maximal running for 45 seconds.

Equipment Required

• 400 m track or flat measured running area
• Cones or distance markers
• Stopwatch or Measurz stopwatch
• Optional timing gates or video timing
• Optional Measurz AR measurement to confirm start/finish markers or distance intervals
• Optional GPS or distance-measurement system
• Optional Measurz metronome for warm-up drills or related pacing work
• MAT tools such as Anker, Gripper and Muscle Meter for related strength profiling
• Measurz/MAT platform for distance, conditions, symptoms, notes and retest comparison

For best repeatability, use a marked track and the same start position each time.

Step-by-Step Protocol

1. Mark a measured track or running area.
2. Complete a progressive warm-up.
3. Athlete starts from a standardised position.
4. On “go”, athlete runs as far as possible in 45 seconds.
5. Stop timing at exactly 45 seconds.
6. Mark the athlete’s position at the 45-second point.
7. Record distance covered to the nearest practical measurement.
8. Record wind, surface, footwear, warm-up and symptoms.

Scoring and Interpretation

Primary score:

Distance covered in metres in 45 seconds

Optional outputs:

• Average speed
• Estimated 400 m performance context
• Distance change from baseline
• Pace notes
• Fatigue or pacing notes

Greater distance generally indicates better speed endurance under the test conditions. Interpretation should account for measurement accuracy, wind, surface and pacing.

Normative Data, Benchmarks or Reference Values

Formal peer-reviewed normative values for the exact 45-Second Run Test are limited.

Topend Sports provides practical coaching guidance suggesting many athletes cover roughly 310–390 m, with higher values more relevant to advanced track athletes. This should be treated as practical field guidance, not formal normative data.  

Practical Field Guide Only

• Elite/very high speed endurance: 390 m or more
• Advanced: 370–389 m
• Intermediate: 340–369 m
• Developing: 310–339 m
• Low current speed-endurance profile: under 310 m

Use baseline comparison and same-condition retesting as the main interpretation method.

Reliability and Validity

Direct peer-reviewed evidence for the exact 45-second run is limited. Related evidence from anaerobic speed reserve research supports the importance of accurately assessing maximal sprint speed and running-based high-intensity performance characteristics in running-based sports.  

Recent sprint bioenergetics modelling research has examined energy contribution across 100–400 m sprint distances, supporting the concept that longer sprint performances involve both anaerobic and aerobic contributions.  

Common Errors and Limitations

Common errors include:

• Inaccurate distance marking
• Delayed stop signal
• Poorly marked final position
• Comparing windy and calm conditions
• Using different tracks or surfaces
• Poor pacing
• Not standardising warm-up
• Treating field estimates as laboratory anaerobic capacity

Practical Applications

The 45-Second Run Test can help professionals:

• Monitor speed endurance
• Track 400 m and 800 m preparation
• Compare baseline and retest distance
• Assess high-intensity running tolerance
• Support conditioning prescription
• Combine running data with sprint, strength, jump and recovery measures

How to Record This in Measurz/MAT

Record:

• Test name: 45-Second Run
• Distance covered
• Units: metres
• Average speed if calculated
• Track or surface
• Timing method
• Wind and conditions
• Footwear
• Warm-up
• Symptoms
• Pacing notes
• Retest date

Measurz can store distance, conditions and notes. The Measurz stopwatch supports timing, while AR measurement can help standardise setup markers where appropriate.

FAQs

What does the 45-Second Run Test measure?

It measures how far an athlete can run in 45 seconds and provides practical information about speed endurance.

Is it an anaerobic capacity test?

It is a field-based speed-endurance test with substantial anaerobic contribution, but it is not a direct laboratory measurement of anaerobic capacity.

Is it mainly for 400 m runners?

It is commonly used in 400 m and 800 m contexts, but it can also be useful for field sport athletes.

Are there formal norms?

Formal exact-test norms are limited. Use practical benchmarks and baseline comparison.

What is the main score?

Distance covered in metres.

Key Takeaways

• The 45-Second Run Test measures distance covered in a fixed time.
• It is best interpreted as a speed-endurance field test.
• Exact formal norms are limited.
• Measurement accuracy is important.
• Measurz can track distance, conditions and progress.

References

Movement Assessment Technologies. (2023). 45-second run test: Anaerobic capacity guide. https://help.matassessment.com/en/articles/75-45-second-run-test-anaerobic-capacity-guide 

Thron, M., Düking, P., Ruf, L., Härtel, S., Woll, A., & Altmann, S. (2024). Assessing anaerobic speed reserve: A systematic review on the validity and reliability of methods to determine maximal aerobic speed and maximal sprinting speed in running-based sports. PLOS ONE. https://doi.org/10.1371/journal.pone.0296866 

Topend Sports. (n.d.). 45-second run test calculator: Predict 400 m time and pace. https://www.topendsports.com/testing/tests/45-seconds-run.htm 

Tremblay, J., et al. (2025). Quantifying metabolic energy contributions in sprint running: A novel bioenergetic model for 100–400 m sprint events. European Journal of Applied Physiology. https://doi.org/10.1007/s00421-025-05831-0