Aerobic Fitness: Yo-Yo Testing

A field sport athlete may have strong general endurance but still struggle to recover between repeated high-intensity efforts. That is where the Yo-Yo Intermittent Recovery Test can be useful.

Unlike continuous running tests, the Yo-Yo Test uses repeated 20 m shuttle runs with short active recovery periods. This makes it more relevant for many stop-start sports such as soccer, rugby, basketball, netball, hockey and Australian football.

This article optimises the supplied Measurz Yo-Yo Test draft and keeps the same practical focus while strengthening the protocol, evidence and interpretation guidance.

Quick Summary

Test name: Yo-Yo Test
Also known as: Yo-Yo Intermittent Recovery Test, Yo-Yo IR1, Yo-Yo IR2
Purpose: Assess intermittent fitness and recovery capacity
Main score: Total distance completed in metres
Best used with: Heart rate, RPE, training load, fatigue, sprint testing and sport-specific conditioning data
Key limitation: Results depend heavily on the exact Yo-Yo version and should not be compared across different protocols.

What Is the Yo-Yo Test?

The Yo-Yo Test is a progressive intermittent shuttle-running test.

The most common field version is the Yo-Yo Intermittent Recovery Test Level 1, often called Yo-Yo IR1. In Yo-Yo IR1, the client completes repeated 2 × 20 m shuttle runs, followed by a 10-second active recovery. The recovery is usually performed by jogging or walking around a marker placed 5 m behind the start line.

The speed increases as the audio file progresses. The test ends when the client voluntarily stops, can no longer maintain the required pace or fails according to the chosen stopping rule.

The Yo-Yo IR1 is generally described as assessing intermittent exercise capacity with high aerobic activation, while Yo-Yo IR2 is more demanding and has a greater contribution from high-intensity anaerobic recovery demands.  

Why It Is Used

The Yo-Yo Test is used because many sports require repeated high-intensity running efforts separated by short recovery periods.

It can help assess:

• intermittent endurance
• high-intensity running tolerance
• recovery between efforts
• conditioning changes across training blocks
• squad or team fitness
• sport-specific running readiness context

It should not be used as a stand-alone return-to-sport clearance test. It can support decision-making, but should be interpreted alongside symptoms, strength, power, sprint capacity, movement quality, training exposure, confidence and sport demands.

What It Measures

The main outcome is total distance covered in metres.

The result reflects a combination of:

• aerobic fitness
• high-intensity running tolerance
• recovery ability
• acceleration and deceleration capacity
• turning efficiency
• pacing
• motivation
• familiarity with shuttle running

It does not directly measure sprint speed, agility, strength, injury risk or full return-to-sport readiness.

Who It Is Useful For

The Yo-Yo Test may be useful for:

• field sport athletes
• court sport athletes
• team sport squads
• tactical populations
• youth athletes with appropriate training history
• general fitness clients who can safely perform maximal shuttle running
• clients progressing through return-to-conditioning

It may be less suitable for clients with current pain, recent injury, poor turning tolerance, balance concerns, significant fatigue, illness or medical risk factors that make maximal running inappropriate.

Equipment Required

• Flat, non-slip surface
• Two lines or cones placed 20 m apart
• Recovery marker placed 5 m behind the start line
• Correct Yo-Yo audio file for the chosen test version
• Speaker loud enough for the testing area
• Recording sheet, MAT or Measurz
• Optional heart rate monitor
• Optional RPE scale

Step-by-Step Protocol / Practice

1. Choose the exact test version.
   Record whether the test is Yo-Yo IR1, Yo-Yo IR2 or another Yo-Yo variant. Do not mix versions.
2. Mark the course.
   Set two lines or cones 20 m apart. Place a recovery marker 5 m behind the start line.
3. Check the testing surface.
   Use a flat, dry, non-slip surface. Record whether testing is indoors, on grass, turf, track or court.
4. Prepare the client.
   Confirm they are well enough to perform maximal running. Ask about pain, illness, fatigue, sleep and recent training load.
5. Complete a standardised warm-up.
   Include light jogging, dynamic mobility, shuttle practice, turning practice and progressive accelerations.
6. Explain the instructions.
   The client runs 20 m out and 20 m back in time with the audio signal, then completes the 10-second active recovery around the 5 m marker.
7. Start the audio file.
   Ensure the client starts on the correct signal and reaches each line in time with the beep.
8. Apply the stopping rule consistently.
   Stop the test when the client voluntarily stops, cannot maintain the pace, or misses the line according to your chosen rule.
9. Record the result.
   Record total distance completed in metres. Also record final level or speed stage if your system uses it.
10. Record context.
    Add heart rate, RPE, symptoms, reason for stopping, surface, footwear, audio file, group or individual setting and any pacing or turning issues.

Scoring and Interpretation

The primary score is total distance completed in metres.

A higher score generally suggests better intermittent running capacity and ability to tolerate repeated high-intensity efforts. However, interpretation should always consider:

• Yo-Yo version used
• audio file used
• surface
• footwear
• stopping rule
• motivation
• test familiarity
• recent training load
• fatigue
• heat and environmental conditions
• heart rate and RPE response
• pain or symptoms during the test

Do not compare Yo-Yo IR1 and Yo-Yo IR2 scores directly. They are different tests with different demands.

A useful interpretation approach is:

• Baseline: What is the client’s first valid score?
• Change over time: Has the score improved under the same protocol?
• Internal comparison: How does the score compare with squad, team or role-specific data?
• Physiological response: Was the score achieved with lower, similar or higher heart rate and RPE?
• Movement response: Did turning, pain, confidence or fatigue limit performance?

Normative Data, Benchmarks or Reference Values

Norms/benchmark level: Level 1 — published reference values are available, but they must match the test version and population.

A major systematic review by Schmitz and colleagues included 248 studies and 9,440 healthy participants aged 16 years and older, and provided structured reference values across Yo-Yo test types, sports, performance levels and sex. The authors concluded that Yo-Yo results differ substantially by sport type, competitive level and test version.  

This means broad categories such as “poor”, “average”, “good” and “excellent” should be used cautiously unless they come from the same test version and a similar population.

Practical benchmark guidance:

• Use Yo-Yo IR1 for general intermittent endurance assessment in many team sport settings.
• Use Yo-Yo IR2 for higher-level athletes who can tolerate a more demanding protocol.
• Compare youth, recreational, sub-elite and elite athletes separately.
• Use sex-specific and sport-specific values where available.
• Avoid applying one universal benchmark scale to all clients.

For example, in high-level male youth soccer players, Deprez and colleagues reported mean Yo-Yo IR1 distances of approximately 2024 ± 470 m for U15, 2404 ± 347 m for U17 and 2547 ± 337 m for U19 players. These values are useful context for high-level male youth soccer only, not general norms for all athletes.  

For Measurz use, the most practical comparison is often:

• the client’s previous score
• team or squad benchmarks
• sport-specific reference data
• age- and sex-relevant data
• heart rate and RPE response
• change over time under the same protocol

Reliability and Validity

The Yo-Yo Intermittent Recovery Test has strong support in intermittent sport settings. Bangsbo, Iaia and Krustrup describe the Yo-Yo IR tests as useful tools for evaluating repeated intense exercise capacity in intermittent sports, with higher-level athletes generally performing better than lower-level athletes in relevant sport groups.  

Reliability depends on the protocol and population. In high-level youth soccer players, Yo-Yo IR1 distance showed strong reliability, with reported ICC values between 0.87 and 0.95 and coefficients of variation between 3.0% and 7.5% across age groups.  

No universal MDC, MCID or typical error value should be applied to every Yo-Yo Test setting. Where the exact population and protocol do not have published measurement-error data, interpret small changes cautiously.

To improve reliability:

• use the same Yo-Yo version
• use the same audio file
• use the same surface
• apply the same stopping rule
• standardise the warm-up
• record footwear
• record heart rate and RPE
• avoid testing during unusual fatigue, illness or heavy training load
• provide consistent instructions
• allow familiarisation where appropriate

Sensitivity and Specificity

Sensitivity and specificity are not applicable for routine Yo-Yo Test use.

The Yo-Yo Test is a fitness and performance test, not a stand-alone diagnostic test. It can support conditioning assessment and progress tracking, but it should not be used to diagnose a condition, rule out injury risk or clear an athlete for sport on its own.

Common Errors and Limitations

Common testing errors include:

• using the wrong Yo-Yo audio file
• not marking the 5 m recovery zone
• comparing IR1 and IR2 scores directly
• using unclear stopping rules
• allowing early turns
• changing surface between tests
• ignoring footwear differences
• testing during unusual fatigue or illness
• applying generic norms to the wrong population

Key limitations include:

• results are highly protocol-dependent
• repeated turning affects performance
• motivation influences final distance
• larger athletes may be affected by repeated acceleration, deceleration and turning demands
• heat, surface and group setting can change results
• the test does not directly measure VO₂max
• one score does not explain why performance changed

Practical Applications

Use the Yo-Yo Test to:

• monitor intermittent fitness
• track conditioning changes
• compare squad results
• guide pre-season fitness goals
• support return-to-conditioning progression
• add context to heart rate and RPE data
• assess tolerance to repeated high-intensity running
• identify whether a client may need more sport-specific conditioning exposure

For many team sports, the Yo-Yo Test may be more relevant than a continuous running test because it includes repeated work and short recovery periods.

How to Record This in Measurz

In Measurz, record:

• test version, such as Yo-Yo IR1 or Yo-Yo IR2
• total distance in metres
• final level or speed stage, if used
• audio file used
• surface
• footwear
• testing environment
• heart rate
• RPE
• reason for stopping
• pain score, if relevant
• symptoms
• recent fatigue or training load
• group or individual testing context
• turning, pacing or motivation notes
• comparison side or baseline, where relevant
• planned retest date
• related findings such as sprint, strength, power or fatigue measures

Example Measurz note:

“Yo-Yo IR1 completed on indoor court. Final distance: 1520 m. Peak HR: 191 bpm. RPE 9/10. Stopped due to general fatigue. No pain. Same audio file, surface and footwear as previous test.”

Related Tests / Internal Links

• Beep Test
• 30-15 Intermittent Fitness Test
• Time Trial Test
• Cooper 12-Minute Run Test
• 6-Minute Walk Test
• Sprint Testing
• Fatigue
• Sleep Quality and Quantity
• Training Load

FAQs

What does the Yo-Yo Test measure?

It measures intermittent shuttle-running performance and recovery capacity during repeated high-intensity efforts.

Is the Yo-Yo Test the same as the Beep Test?

No. The Beep Test is continuous, while the Yo-Yo Intermittent Recovery Test includes short active recovery periods between shuttles.

What is a good Yo-Yo Test score?

A good score depends on the test version, sport, age, sex and performance level. Use sport-specific and test-specific benchmarks where possible.

Should I use Yo-Yo IR1 or Yo-Yo IR2?

Yo-Yo IR1 is usually more appropriate for general intermittent endurance assessment. Yo-Yo IR2 is more demanding and better suited to higher-level athletes with strong high-intensity running capacity.

Is the Yo-Yo Test diagnostic?

No. It is a fitness performance test. It should not be used to diagnose a condition, confirm recovery or clear sport participation on its own.

Key Takeaways

The Yo-Yo Test assesses intermittent running fitness and short-recovery capacity.

Yo-Yo IR1 and Yo-Yo IR2 are different protocols and should not be compared directly.

Published benchmark data exists, but it must match the test version, sport, sex, age and performance level.

Small changes should be interpreted cautiously unless they exceed known measurement error for the same protocol and population.

Measurz users should record the version, distance, audio file, surface, footwear, HR, RPE, symptoms and reason for stopping.

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 

Deprez, D., Fransen, J., Lenoir, M., Philippaerts, R. M., & Vaeyens, R. (2015). The Yo-Yo intermittent recovery test level 1 is reliable in young high-level soccer players. Biology of Sport, 32(1), 65–70. https://doi.org/10.5604/20831862.1127284 

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