Official protocol by Jens Bangsbo (early 1990s) · Intermittent Endurance
Yo-Yo Intermittent Endurance Test Level 1 (Yo-Yo IE1)
Test aerobic endurance capacity in intermittent sports with shorter rest intervals
Primary measureDistance (m) or Level.Circuits
CategoryIntermittent Endurance
FormatPROGRESSIVE
Pacing audio0.01s Calibrated
Standardized testing protocol
Runners complete 20m shuttle runs at incrementally increasing speeds with a shorter 5-second active rest between 40m circuits.
Required field equipment
25-meter track with markers at 0, 5, and 25m, audio source with double-beep cue
Calculation formula & scoring
Time4Test automates this equation directly during the session:
Score is recorded as Speed Level.Circuits or Total Distance (meters).
Scientific reference
Schmitz B. et al. (2018). The Yo-Yo Intermittent Tests: A Systematic Review. Front Physiol.
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