Official protocol by Georges Gacon (1994) · Intermittent Endurance
Gacon 45‑15 Intermittent Fitness Test (Beginner 8 km/h)
Determine intermittent Maximum Aerobic Speed (iMAS) starting at 8 km/h for youth or beginners
Primary measureMaximum speed (km/h) of last stage
CategoryIntermittent Endurance
FormatPROGRESSIVE
Pacing audio0.01s Calibrated
Standardized testing protocol
Alternating 45 seconds of running followed by 15 seconds of passive rest. First stage is 8 km/h (100m in 45 sec), with distance increasing by 6.25m per stage.
Required field equipment
Flat running surface, marking cones, measuring tape, Time4Test audio beeper
Calculation formula & scoring
Time4Test automates this equation directly during the session:
Highest speed stage (km/h) fully completed represents iMAS.
Scientific reference
The Gacon 45/15 protocol for youth and beginner athletic development.
Execute in Time4Test
Calibrated acoustic audio cues, live split recording, and instant automated calculation on your smartphone.
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