Aerobic Fitness: Yo-Yo Endurance Test

A field sport athlete may be able to run steadily for a long time but still struggle to repeat higher-speed efforts with short recovery periods.

The Yo-Yo Endurance Test provides a practical way to assess repeated shuttle-running endurance in a structured field setting. It can help professionals monitor conditioning, compare results over time and understand how well a client tolerates repeated running efforts.

The result should be interpreted with the exact Yo-Yo test version, running level, symptoms, recent training load, surface, footwear, pacing and recovery response.

Quick Summary

Test name: Yo-Yo Endurance Test
Also known as: Yo-Yo Intermittent Endurance Test, Yo-Yo Test, Yo-Yo Shuttle Test
Purpose: Assess intermittent running endurance and repeated shuttle-running capacity
What it assesses: Distance completed, running tolerance, pacing, ability to follow progressive audio cues and intermittent endurance performance
Equipment required: Measured 20 m course, cones, audio file or app, speaker, flat surface, Measurz recording system
Key finding: Total distance completed or final level/shuttle reached
Best used with: Heart rate, RPE, training load, sprint testing, change-of-direction testing, time trials, GPS running data and previous results
Key limitation: Results are influenced by test version, surface, footwear, pacing, motivation, turning ability, audio timing and recent fatigue

What Is the Yo-Yo Endurance Test?

The Yo-Yo Endurance Test is a progressive shuttle-running field test.

The client runs back and forth between markers in time with audio beeps. The running speed increases progressively. Depending on the version used, the test may include a short recovery period between shuttles.

Common Yo-Yo test families include:

• Yo-Yo Endurance Test
• Yo-Yo Intermittent Endurance Test
• Yo-Yo Intermittent Recovery Test
• Level 1 and Level 2 versions

The exact version must be recorded because distances, speeds, recovery periods and interpretation differ.

Why It Is Used

The Yo-Yo Endurance Test is used to monitor field-based endurance and intermittent running capacity.

It can help professionals:

• track conditioning changes
• assess repeated running tolerance
• monitor team sport fitness
• guide conditioning decisions
• compare performance across testing blocks
• monitor training response
• support return-to-running progressions
• interpret fitness alongside RPE, heart rate and symptoms

It is useful because the test is practical, low-cost and easy to repeat when the setup is standardised.

What It Measures

The Yo-Yo Endurance Test measures performance during a progressive shuttle-running task.

It may reflect:

• intermittent running endurance
• aerobic contribution
• repeated acceleration and deceleration tolerance
• turning ability
• pacing
• motivation
• ability to follow audio cues
• recovery between efforts where applicable
• fatigue resistance

It does not directly measure:

• VO₂max unless a validated equation is used
• running economy
• lactate threshold
• isolated speed
• isolated change-of-direction ability
• injury risk
• sport readiness
• diagnosis

A better Yo-Yo result is useful, but it should be interpreted as a field performance measure rather than a complete fitness profile.

Who It Is Useful For

The Yo-Yo Endurance Test may be useful for:

• field sport athletes
• court sport athletes
• team sport players
• tactical populations
• general fitness clients with suitable running capacity
• performance coaches
• strength and conditioning coaches
• return-to-running clients when appropriate
• professionals monitoring conditioning over time

It may not be suitable for clients who cannot safely run, accelerate, decelerate, turn repeatedly or tolerate progressive running intensity.

Equipment Required

You will need:

• flat non-slip running surface
• measured 20 m course
• cones or markers
• Yo-Yo audio file or app
• speaker loud enough for the testing area
• stopwatch as backup
• recording sheet or Measurz/MAT recording system

Optional equipment:

• heart rate monitor
• RPE scale
• pain or symptom scale
• weather and wind notes
• footwear notes
• video recording if movement quality is being observed
• GPS or wearable data where appropriate

Step-by-Step Protocol

1. Choose the correct test version

Select the exact Yo-Yo version and level. Record whether it is an endurance, intermittent endurance or intermittent recovery version.

2. Prepare the course

Measure the course accurately and mark the turning lines with cones.

3. Check the audio

Test the audio file, speaker volume and timing before starting.

4. Record pre-test context

Record recent training load, sleep, fatigue, soreness, pain, weather, surface and footwear.

5. Complete a standardised warm-up

Use the same warm-up each time, including light running, mobility and short build-up runs where appropriate.

6. Explain the test

Tell the client to run in time with the beeps, reach the line by the beep and follow the recovery instructions for the chosen version.

7. Start the test

Begin the audio and have the client run according to the test instructions.

8. Monitor performance

Watch whether the client reaches the line on time, turns safely and follows the recovery period correctly.

9. Apply stopping rules

Stop the test according to the protocol, commonly when the client twice fails to reach the line in time, chooses to stop, or symptoms make continuation unsafe.

10. Record the result

Record the final level, shuttle number, total distance, symptoms, RPE, heart rate and reason for stopping.

Scoring and Interpretation

The primary score is usually total distance completed.

Other useful scores include:

• final level
• final shuttle
• estimated VO₂max where a validated equation is used
• heart rate response
• RPE
• symptoms
• recovery response
• reason for stopping

A greater total distance generally suggests better intermittent running endurance under the tested protocol.

Interpretation is stronger when paired with:

• similar or lower RPE
• similar or lower heart rate
• faster recovery
• improved repeat result
• better tolerance of turns
• fewer symptoms
• similar testing conditions

A lower score does not always mean reduced fitness.

It may reflect:

• poor sleep
• heavy training load
• heat
• wind
• different surface
• different footwear
• poor pacing
• low motivation
• pain or symptoms
• unfamiliarity with shuttle running
• audio or setup error

Focus on trends over time rather than one isolated result.

Normative Data, Benchmarks or Reference Values

There is no single universal norm for all Yo-Yo tests.

Results depend on:

• exact test version
• Level 1 or Level 2
• age
• sex
• sport
• playing level
• training status
• surface
• footwear
• motivation
• turning ability
• audio file accuracy

A systematic review of Yo-Yo intermittent tests found that reference values differ by sport type and performance level. This means results should be compared only with data from the same Yo-Yo version and a similar population.

For most Measurz use, interpret Yo-Yo results using:

• the client’s own baseline
• repeat testing under the same conditions
• team or organisation benchmarks
• sport-specific data where available
• distance completed
• RPE
• heart rate
• recovery response
• symptoms
• recent training load

Avoid comparing results across different Yo-Yo versions or levels.

Reliability and Validity

The Yo-Yo tests have been widely studied in sport and exercise settings and are commonly used to monitor intermittent endurance performance.

Reliability improves when:

• the same test version is used
• the course is measured accurately
• the same surface is used
• the same audio file is used
• the same warm-up is used
• footwear is recorded
• weather is recorded
• client familiarisation is provided
• stopping rules are consistent
• recent training load is considered

The Yo-Yo Endurance Test is valid as a field test of repeated shuttle-running performance under the chosen protocol. It should not be described as a direct measure of VO₂max unless a validated equation is applied.

Sensitivity and Specificity

Sensitivity and specificity are not usually applicable for routine Measurz use of the Yo-Yo Endurance Test.

This is a performance assessment, not a stand-alone diagnostic or screening test.

It can help monitor endurance performance and training response, but it does not diagnose a condition, determine injury risk, classify readiness or prove sport preparedness on its own.

Common Errors and Testing Limitations

Common errors include:

• not recording the exact Yo-Yo version
• using an inaccurate course distance
• using a poor-quality audio file
• changing surface between sessions
• changing footwear
• not standardising warm-up
• not recording recent fatigue or training load
• applying norms from a different version
• stopping inconsistently
• ignoring symptoms
• treating an estimated VO₂max as a direct laboratory measure

Key limitations include:

• strongly affected by motivation and pacing
• turning ability affects results
• surface can change performance
• heat and wind can affect outdoor testing
• not suitable for every client
• does not isolate aerobic fitness from turning and shuttle-running skill
• should be interpreted with other assessments

Practical Applications

Use the Yo-Yo Endurance Test to:

• monitor conditioning progress
• track intermittent running tolerance
• assess response to a training block
• support team sport fitness testing
• guide return-to-running progression
• compare performance across repeated tests
• combine performance with RPE and heart rate
• support conditioning decisions

It is most useful when combined with sprint testing, change-of-direction testing, time trials, strength testing, jump testing and training-load monitoring.

How to Record This in Measurz

In Measurz, record:

• exact Yo-Yo test version
• level
• course distance
• total distance completed
• final level and shuttle
• timing/audio source
• surface
• footwear
• warm-up
• heart rate
• RPE
• pain score
• symptom location
• fatigue score
• recent training load
• weather if outdoors
• reason for stopping
• retest date

Example note:

“Yo-Yo Intermittent Endurance Test Level 1 completed indoors on court surface. Total distance: 1,240 m. Final level/shuttle recorded from app. RPE 9/10. Peak HR 188 bpm. No pain. Stopped after second missed line. Same audio and course to be used for retest.”

Related Tests or Internal Linking Suggestions

• Time Trial Test
• Beep Test
• Yo-Yo Intermittent Recovery Test
• Cooper 12-Minute Run Test
• 6-Minute Walk Test
• Sprint Test
• Change of Direction Test
• Repeated Sprint Test
• 30-15 Intermittent Fitness Test
• Running Gait Analysis
• Training Load
• Fatigue
• Sleep Quality and Quantity

FAQs

What does the Yo-Yo Endurance Test measure?

It measures intermittent running endurance and repeated shuttle-running performance under a progressive audio-paced protocol.

Is it the same as the Beep Test?

No. Some versions are similar, but Yo-Yo tests include different structures and, in intermittent versions, recovery periods.

Which Yo-Yo version should I use?

Choose the version that matches the client’s sport, fitness level and assessment goal. Always record the exact version.

Does the Yo-Yo Test measure VO₂max?

Not directly. It measures field performance. VO₂max may be estimated only when using a validated equation for the exact test version.

How often should I retest?

Every 4–8 weeks is often practical, depending on the training block, client tolerance and testing goal.

Should I record heart rate and RPE?

Yes. Heart rate and RPE help explain whether the result reflects improved conditioning, increased effort or fatigue.

Can the Yo-Yo Test determine return to sport?

No. It can contribute to a broader test battery, but it should not be used alone to determine readiness.

Key Takeaways

• The Yo-Yo Endurance Test is a practical field test of intermittent running performance.
• The exact version and level must be recorded.
• Results are influenced by surface, pacing, motivation, turning ability and recent fatigue.
• Norms should only be used when the test version and population match.
• Interpret distance, RPE, heart rate and recovery together.
• Measurz should record protocol, distance, level, symptoms, heart rate, RPE and retest context.

References

Bangsbo, J., Iaia, F. M., & Krustrup, P. (2008). The Yo-Yo intermittent recovery test: A useful tool for evaluation of physical performance in intermittent sports. Sports Medicine, 38(1), 37–51. https://doi.org/10.2165/00007256-200838010-00004

Grgic, J., Oppici, L., Mikulic, P., Bangsbo, J., Krustrup, P., & Pedisic, Z. (2019). Test–retest reliability of the Yo-Yo test: A systematic review. Sports Medicine, 49(10), 1547–1557. https://doi.org/10.1007/s40279-019-01143-4

Schmitz, B., Pfeifer, C., Kreitz, K., Borowski, M., Faldum, A., & Brand, S.-M. (2018). The Yo-Yo intermittent tests: A systematic review and structured compendium of test results. Frontiers in Physiology, 9, 870. https://doi.org/10.3389/fphys.2018.00870

Topend Sports. (n.d.). Yo-Yo test. https://www.topendsports.com/testing/yo-yo-test.htm