How to Conduct the Yo-Yo Intermittent Recovery Test

When Jens Bangsbo and colleagues validated the Yo-Yo Intermittent Recovery Test Level 1 (IR1) against laboratory VO2max measurements in 1996, they reported a correlation of r = 0.71 — acceptable for a field test, but more importantly, the test's high ecological validity for intermittent-sport athletes made it the most widely adopted aerobic fitness test in team sports globally. Today, the Yo-Yo IR1 and IR2 are used by FIFA, UEFA, the NFL, and the NRL as primary fitness benchmarks. This guide explains exactly how to conduct both versions, how to interpret results, and how to convert performance into actionable training prescriptions.

Test Overview and Variants

The Yo-Yo family comprises four tests across two categories. The Yo-Yo Endurance Tests (Level 1 and 2) assess aerobic capacity under continuous loading — appropriate for distance runners or cyclists. The Yo-Yo Intermittent Recovery Tests (IR1 and IR2) add a 10-second active recovery walk between 20-meter shuttle pairs, making them far more relevant for soccer, basketball, rugby, hockey, and handball athletes.

IR1 vs. IR2 — When to Use Each

• IR1: Starts at 10.0 km/h, progressively increases to 19.0 km/h. Duration: typically 6–20 minutes for well-trained athletes. Best for general population, youth athletes (U15+), and recreational players.
• IR2: Starts at 13.0 km/h — already at a moderate-to-vigorous running pace. Duration: typically 2–9 minutes. Best for elite adult athletes where IR1 would take too long before reaching a meaningful challenge.

Both versions use the same 20-meter shuttle course with audio beeps. The key distinction is starting speed and progression rate: IR2 increases speed approximately 1 km/h every 4 shuttles versus IR2's faster ramp rate, exhausting elite players within a sport-relevant window.

Physiological Demands and VO2max Prediction

The 10-second recovery period between shuttle pairs is the defining feature of the IR tests. During this active walk, heart rate partially recovers — typically dropping 8–14 bpm — before the next shuttle begins. This creates a repeated cardiac challenge that specifically stresses stroke volume recovery capacity, a determinant of intermittent-sport performance that continuous tests fail to capture.

During maximal IR1 performance, oxygen uptake reaches 90–98% of VO2max in the final stages (Bangsbo et al., 2008). Blood lactate concentrations at exhaustion average 8–12 mmol/L — substantially higher than incremental treadmill tests reaching comparable VO2max, reflecting the anaerobic contribution of acceleration/deceleration mechanics in the 20-meter shuttle format.

VO2max Estimation Formula (Bangsbo, 1996)

For IR1: VO2max (mL/kg/min) = IR1 distance (m) × 0.0084 + 36.4

Example: An athlete completing 1,640 m estimates VO2max = (1,640 × 0.0084) + 36.4 = 50.2 mL/kg/min. Note that this formula has a standard error of estimate of approximately ±3.5 mL/kg/min — adequate for group tracking but insufficient for individual medical diagnosis.

Equipment and Field Setup

• Audio source: Calibrated Yo-Yo audio files (available via Bangsbo Sport or validated third-party apps). Never use unofficial audio — tempo inaccuracies of even ±0.5 seconds per shuttle invalidate normative comparisons.
• Speaker: Minimum 10W outdoor speaker audible at 20 meters over ambient crowd noise (≥75 dB at athlete position).
• Cones: Mark start/finish line, turnaround line (20 m away), and recovery zone end line (2.5 m behind start line). The recovery zone must be clearly delineated.
• Surface: Natural grass, artificial turf, or indoor hardwood — record surface for all future testing sessions as surface affects performance by 3–8% (Buchheit et al., 2010).
• Timing: Test between 10:00 and 14:00 local time when possible. Avoid testing within 24 hours of a competition or high-intensity training session.
• Athlete preparation: No strenuous training 24 hours prior; standardized pre-test meal (3–4 hours prior, approximately 1 g carbohydrate per kg bodyweight).

Test Protocol Step by Step

Pre-Test Warm-Up (10 Minutes)

5-minute jog at comfortable pace → 5 × 20-meter accelerations at progressive intensities (50%, 60%, 70%, 80%, 90% effort). Allow 90 seconds between acceleration runs. Do not include maximal sprints in warm-up — pre-activation of the phosphocreatine system increases early-stage test scores but introduces variability.

Conduct

1. Athletes line up on the start line in groups of no more than 8 per lane to allow the administrator to monitor foot position at turnaround.
2. Begin the audio file. Athletes start running on the first audible beep.
3. Athletes must reach the 20-meter turnaround line before the second beep, then return to the start line before the third beep.
4. On the fourth beep (start of recovery period), athletes walk at an easy pace within the 2.5-meter recovery zone for 10 seconds.
5. The fifth beep initiates the next shuttle pair. This sequence repeats with progressively shorter intervals between beeps as speed increases.

Stopping Criteria

An athlete is disqualified when they fail to reach the turnaround or start line before the relevant beep on two consecutive occasions. Record the stage and shuttle number completed on the second failure. A single failure followed by recovery is acceptable — this is a common source of confusion when coaches administer the test for the first time.

Data Recording

Record: stage, number of shuttles in final stage, total distance covered, environmental conditions (temperature, humidity, surface). Use the formula: Total distance = (completed full stages × distance per stage) + (shuttles in incomplete final stage × 40 m). Each shuttle covers 2 × 20 m = 40 m.

Sport-Specific Norms and Scoring

Data sources: Bangsbo et al. (2008), Krustrup et al. (2006). Position-specific norms exist within soccer — central midfielders average ~300 m more than central defenders in the same squad. Goalkeepers should use position-specific reference ranges and may find the IR2 version inappropriate.

For IR2 (elite athlete populations): expected ranges are 640–1,080 m for male outfield soccer players, corresponding to estimated VO2max of approximately 50–58 mL/kg/min using a separate IR2 prediction equation (Bangsbo et al., 2008).

Training Applications from Test Results

The Yo-Yo IR test result directly prescribes high-intensity interval training (HIIT) intensity. The speed at exhaustion — the highest running speed reached — corresponds closely to vVO2max (the minimal velocity that elicits VO2max). Training at 90–95% of the Yo-Yo exhaustion speed for intervals of 15–30 seconds with matching recovery develops the specific cardiac and metabolic systems the test stresses.

Prescribing HIIT from Yo-Yo Performance

If an athlete exhausts at speed level 17.0 km/h during IR1, their training prescription would be: 10–15 repetitions of 15-second runs at 15.3–16.2 km/h (90–95%) with 15-second active recoveries at 5 km/h. A 6-week block of this training produced a 15% improvement in Yo-Yo IR1 distance in professional soccer players (Krustrup et al., 2010).

For athletes scoring below the 50th percentile for their sport, continuous aerobic base work (30–40 minutes at 70% maximum heart rate, 3× weekly) takes priority over HIIT for the first 4–6 weeks. The intermittent recovery capacity tested by the Yo-Yo battery requires a minimum aerobic base before intermittent training produces superior returns.

Common Administration Errors

• Unofficial audio files: Tempo drift in unauthorized recordings can shorten or lengthen shuttle intervals by 0.2–0.8 seconds — sufficient to alter recorded distance by 80–160 m.
• Testing after training: Acute neuromuscular fatigue from the preceding 24 hours reduces Yo-Yo IR1 distance by 8–12% in team athletes. Always test at the start of a session following a rest day.
• Inadequate motivation: The Yo-Yo test is highly motivation-dependent. Group testing consistently produces 5–10% higher scores than individual testing. Standardize the motivational environment: use the same administrator voice, no individual verbal encouragement, same time of day.
• Misidentifying the stopping criterion: Many coaches stop athletes after a single missed beep. The official criterion is two consecutive failures — premature stopping underestimates fitness by an average of one full speed level.
• Ignoring environmental conditions: Each 5°C increase above 20°C reduces IR1 distance by approximately 4–7% due to cardiovascular drift from thermoregulatory demands. Document temperature and apply caution when comparing across seasons.