Yo-yo intermittent recovery test: Complete guide to protocol and scoring

Key Takeaways

The yo-yo intermittent recovery test (YYIRT) measures an athlete’s ability to perform repeated high-intensity shuttle runs with short active recovery periods between each bout.

Two levels exist: Level 1 (YYIRT1) starts at 10 km/h and suits recreational to semi-professional athletes; Level 2 (YYIRT2) starts at 13 km/h and is built for elite performers.

Score is recorded as the level and shuttle reached (for example 17.5), or as total distance covered in meters, where each completed shuttle adds 40 meters.

You can estimate VO2max from the distance covered: for Level 1, VO2max = distance in meters x 0.0084 + 36.4.

Sports medicine and physical therapy practices use the YYIRT for baseline screening, return-to-sport readiness, and tracking rehabilitation progress alongside documented athlete health records in Pabau.

Most fitness tests measure a single sustained effort. Team sport athletes rarely work that way. A footballer, rugby player, or basketball guard sprints, decelerates, recovers for a few seconds, then does it again, dozens of times per match.

The yo-yo intermittent recovery test was designed to measure exactly that capacity, and it has become the standard field test for intermittent exercise performance across professional and recreational sport alike.

This guide covers what the yo-yo intermittent recovery test is, how to set it up and administer it, how to score and interpret results, how to estimate VO2max from the distance covered, and how sports medicine and physical therapy practices use it beyond the coaching context.

What is the yo-yo intermittent recovery test?

The yo-yo intermittent recovery test is a field-based fitness assessment developed by Jens Bangsbo, a Danish sports medicine researcher at the University of Copenhagen. It evaluates an individual’s ability to repeatedly perform high-intensity exercise with short, active recovery periods in between.

Unlike a steady-state VO2max treadmill test, the YYIRT replicates the physical demands of team sport, where explosive effort, brief recovery, and repeated sprint capacity matter more than sustained aerobic endurance.

Bangsbo and colleagues published the foundational validation research in peer-reviewed journals, establishing the test’s reliability and physiological relevance. It is now used internationally in football (soccer), rugby, basketball, field hockey, and handball, as well as in clinical and occupational fitness settings.

Types of yo-yo tests: Understanding the variants

Three distinct tests make up the Yo-Yo family. Each measures a different physical quality, and choosing the right one depends on the population being tested and the performance attribute being assessed.

Within the yo-yo intermittent recovery test, two levels exist. The yo-yo intermittent recovery test level 1 (YYIRT1) targets recreational to semi-professional athletes and begins at a running speed of 10 km/h. The yo-yo intermittent recovery test level 2 (YYIRT2) is designed for elite athletes and opens faster, at 13 km/h, producing a shorter but more intense assessment.

Both use identical 2 x 20 m shuttle distances and 10-second recovery structures, so the core protocol is the same regardless of level.

What does the yo-yo intermittent recovery test measure?

The YYIRT primarily assesses intermittent exercise capacity: the ability to recover between high-intensity bouts and perform them repeatedly. This is distinct from pure aerobic capacity, which reflects the maximum rate of oxygen uptake (VO2max) during sustained exercise.

• Aerobic recovery capacity: how efficiently the cardiovascular and metabolic systems reset between bouts
• Repeated sprint ability: the ability to sustain maximal or near-maximal efforts across multiple shuttles
• VO2max estimation: published formulas allow indirect VO2max calculation from the total distance covered, though these estimates should be treated as approximations and cited from peer-reviewed sources rather than as equivalent to laboratory testing
• Sport-specific fitness: the test’s intermittent structure matches the work-to-rest ratios common in football, rugby, and basketball more closely than any continuous-run protocol

Equipment required to administer the yo-yo intermittent recovery test

The test’s appeal is its minimal kit list. Almost any flat, non-slip outdoor or indoor surface works, and you need no specialist hardware beyond a calibrated audio source.

• Flat, non-slip surface at least 25 meters long (a 20 m shuttle plus a 5 m recovery zone)
• Measuring tape or pre-marked course
• Cones or markers: three lines at 0 m (start/finish), 20 m (turnaround), and 5 m behind the start line (recovery zone marker)
• Official Yo-Yo IRT audio track (Level 1 or Level 2) played through a speaker loud enough for all participants to hear clearly
• Recording sheets (one per athlete) to log level reached, shuttle number, and total distance
• Test administrator to observe and call failures

The audio track is the metronome of the test. It dictates running pace, signals the start and end of each shuttle, and calls the recovery period. Using an uncalibrated or unofficial audio file will invalidate results.

For practitioners working in physical therapy and sports medicine settings, standardizing the audio source across testing sessions is essential for valid longitudinal comparisons. A recording sheet template can be downloaded from official sports science resources; scoring principles are covered in the next section.

Step-by-step test protocol

Administer the yo-yo intermittent recovery test consistently to preserve reliability. Follow these steps in sequence.

1. Set up the course. Mark the start/finish line (0 m), the turnaround cone (20 m), and the recovery marker (5 m behind the start line). Ensure the surface is clear and athletes are wearing appropriate footwear.
2. Brief participants. Explain that they will run 2 x 20 m shuttles at the pace dictated by the audio beep, then jog to the 5 m recovery marker and back to the start line in the 10-second active recovery window before the next bout begins.
3. Conduct a warm-up. Use the opening stages of the audio track as a structured warm-up. Both Level 1 and Level 2 begin at a lower speed to allow participants to find their rhythm.
4. Start the test. Athletes begin running on the audio signal. They must touch or cross the 20 m line in time with each beep, turn, and return to the start line in time with the second beep.
5. Active recovery. On completion of each 2 x 20 m bout, athletes jog to the 5 m recovery cone and back to the start line within the 10-second window. The next running bout starts immediately on the next beep.
6. Increase speed. The audio track automatically increases running speed at set intervals. Administrators do not need to change anything: the track manages pacing.
7. Record failure. An athlete is withdrawn after two consecutive failures to reach the turnaround cone in time with the beep. Record the level and shuttle number at the point of the final completed shuttle.

The key procedural difference between Level 1 and Level 2 is starting speed. Level 2 opens considerably faster, so elite athletes reach exhaustion in fewer total shuttles while still producing a discriminating result. For most return-to-running assessments in clinical contexts, Level 1 is the appropriate choice unless the athlete is at a high performance level.

How to score the yo-yo intermittent recovery test

Scoring is straightforward. Record the level and shuttle number at the point where the athlete completed their last successful bout, then convert this to a total distance in meters. Most published normative tables list distances directly, so manual calculation is rarely needed in practice.

A result is written in one of two ways. The first is level and shuttle notation, for example 17.5, which means the athlete reached shuttle 5 of level 17 before withdrawal. The second is total distance covered in meters, which most practitioners prefer because it feeds directly into normative tables and VO2max estimates.

Converting to distance is simple. Each completed bout is one 2 x 20 m shuttle, so it adds 40 meters. Multiply the number of completed shuttles by 40 to get the total. An athlete who completes 30 shuttles covers 30 x 40 = 1,200 meters.

On Level 1 the speed levels start at 5, skip to 9, then climb through 23, so most tested athletes finish somewhere between level 13 and level 20.

Record the level, shuttle, and distance on a dedicated score sheet for every athlete. A printable yo-yo intermittent recovery test score sheet keeps the level, shuttle number, and running total in one place, which matters when you are testing a full squad in a single session.

For verified level-to-distance figures, reference Bangsbo et al. (2008) or the standards table supplied with your official audio file. Practice management software like Pabau lets practitioners log YYIRT scores with its measurements tracking feature, alongside other fitness metrics inside each athlete’s client record, creating a longitudinal dataset across testing cycles.

How to estimate VO2max from your yo-yo test score

Convert the total distance covered into an estimated VO2max using the equations Bangsbo and colleagues published alongside the test. There is no separate yo-yo intermittent recovery test VO2 max calculator you need to buy: the arithmetic is a single line, and the distance you already recorded is the only input.

• Level 1 (YYIRT1): VO2max (mL/kg/min) = distance in meters x 0.0084 + 36.4
• Level 2 (YYIRT2): VO2max (mL/kg/min) = distance in meters x 0.0136 + 45.3

Worked example: an amateur footballer who covers 1,240 meters on Level 1 has an estimated VO2max of (1,240 x 0.0084) + 36.4 = 46.8 mL/kg/min. Treat the figure as an approximation of aerobic capacity, not a laboratory-grade measurement, and keep every athlete on the same level so the numbers stay comparable across testing cycles.

The distance-to-VO2max figures above are calculated directly from the Level 1 equation, so they move in a straight line with distance. They give a fast aerobic benchmark from a field test that needs no gas-analysis equipment, which is why the yo-yo intermittent recovery test distances are so widely tracked in team settings.

Normative data and performance benchmarks

Normative data for the yo-yo intermittent recovery test varies across sports, age groups, and competitive levels. Apply norms only to populations that match the source study, as benchmarks for adult male football players do not translate to female hockey players or youth athletes.

These figures are indicative ranges drawn from published sport-science literature and should be confirmed against the specific norms table from Bangsbo et al. or the relevant national sports federation before clinical or selection use.

The Bangsbo et al. (2008) validation paper (published in Sports Medicine) remains the primary normative reference, supplemented by sport-specific publications from bodies such as FIFA and World Rugby.

Track athlete fitness results across every testing cycle

Pabau lets sports medicine practitioners and physical therapists log YYIRT scores, document return-to-sport progress, and maintain a full client record for each athlete. All in one place.

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Yo-yo IRT audio: The beep track explained

The audio file is not optional. It governs every aspect of test pacing. Without a calibrated, official audio track, there is no valid yo-yo intermittent recovery test result.

• What the audio controls: the start and end of each 20 m shuttle, the 10-second recovery window, and progressive speed increments
• Level 1 vs Level 2 audio: the two levels use different audio files with different starting speeds. They are not interchangeable. Using the Level 2 file with a Level 1 cohort will produce invalid comparisons against Level 1 norms.
• Where to source the official file: the official audio is available through licensed sport science suppliers and platforms endorsed by test developers. Do not use unofficial recordings from unverified sources, as calibration accuracy cannot be guaranteed.
• Nike SPARQ version: Nike incorporated the yo-yo intermittent recovery test into its SPARQ Rating system, a high-school and college talent-identification combine circuit used for recruiting, not an NFL Scouting Combine event. The SPARQ program has since been discontinued, but the test protocol within it was identical to the standard YYIRT. References to the “Nike SPARQ Yo-Yo” in older scouting literature refer to the same core assessment.

Reliability, validity, and limitations of the yo-yo intermittent recovery test

The YYIRT has strong published reliability for team sport populations. A PubMed-indexed paper (PMID 18081366) by Bangsbo and colleagues confirmed high test-retest reliability across football, basketball, and handball cohorts, making it one of the most rigorously validated intermittent field tests available.

Construct validity is supported by significant correlations between YYIRT performance and high-intensity running distance in competitive matches, as documented by Krustrup et al. (2003) in the Journal of Sports Sciences. This means the test measures something that demonstrably predicts match performance, not merely laboratory fitness markers.

Three conditions limit accuracy and should be controlled or documented in any formal testing session.

• Surface type: grass, artificial turf, and indoor flooring produce different traction and fatigue profiles. Results across surfaces are not directly comparable.
• Environmental temperature: heat significantly impairs repeated sprint recovery. Testing in high ambient temperatures will depress scores relative to controlled indoor conditions.
• Athlete motivation: like all maximal effort tests, the YYIRT is volitional. A poorly motivated or poorly briefed participant will stop before physiological exhaustion.

Advantages and disadvantages of the yo-yo IRT

Before selecting the YYIRT for a testing battery, weigh these practical considerations.

How sports medicine and physical therapy practices use the yo-yo intermittent recovery test

Coaches use the YYIRT to rank and select players. Sports medicine and physical therapy practices use it differently, and this distinction matters for how results are documented and interpreted.

Four clinical applications stand out.

• Baseline fitness screening: establishing a pre-season or pre-training YYIRT score gives practitioners a reference point. If an athlete later presents with injury, that baseline anchors the rehabilitation plan and defines the fitness level they need to return to.
• Return-to-sport readiness: the YYIRT is one component of a return-to-sport assessment battery. A recovering athlete must demonstrate YYIRT performance within an acceptable range of their pre-injury baseline before progressing to full training. It should never be used as a standalone clearance decision.
• Rehabilitation progress tracking: repeating the test at intervals through a rehabilitation program provides objective data on cardiorespiratory recovery. This is especially useful for practitioners working in occupational sport medicine, where an athlete’s fitness level has contractual or insurance implications.
• Occupational and military fitness assessment: some occupational settings (armed forces, firefighting, police services) have adopted intermittent recovery tests as fitness standards. The YYIRT or equivalent protocols appear in fitness-to-serve frameworks in several countries, applying compliance requirements that practices must document carefully.

Documentation is where many practice workflows break down. Test results recorded on paper sheets are easily lost, cannot be compared across sessions without manual calculation, and do not integrate with clinical notes.

Pabau’s athlete health record lets practitioners store YYIRT results against a timestamp, attach session notes, and view longitudinal progression without manual data entry. When combined with digital forms for pre-test screening and consent, the entire testing workflow sits inside one system.

Sports medicine practices managing multiple athletes benefit particularly from centralized records when documenting patient care management across seasonal testing cycles.

Centralizing records is only half the equation; the value of that data depends on capturing the right context alongside every result.

Conclusion

The yo-yo intermittent recovery test remains the most widely validated field measure of repeated high-intensity exercise capacity. Its intermittent structure maps directly onto team sport demands, which is why it has become embedded in professional football, rugby, basketball, and hockey programs worldwide.

For sports medicine clinicians and physical therapists, the test’s value extends beyond squad selection. Baseline screening, return-to-sport progressions, and rehabilitation milestones all benefit from objective YYIRT data, provided results are documented systematically.

Pabau’s sports medicine software provides the client record infrastructure to log, compare, and track YYIRT scores across an athlete’s full care history. To see how it fits a sports medicine or physical therapy workflow, book a demo.

Continue your research

Running a sports medicine or physical therapy practice? Sports medicine software covers how Pabau supports athlete record-keeping, scheduling, and clinical documentation across multi-athlete practices.

Need a structured return-to-sport progression framework? Return-to-running protocol for physical therapy provides a step-by-step guide to progressive load management post-injury.

Want to track standardized assessment scores over time? Measurements tracking software lets practitioners log fitness test results alongside clinical notes in a single timeline view.

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