Official protocol by Georges Gacon (1994, 2004) · Intermittent Endurance
45-15 Gacon's Intermittent Test (45-15 FIT)
Determine Maximum Aerobic Speed in an intermittent format to calibrate interval loads
Primary measureSpeed (km/h) of last completed level
CategoryIntermittent Endurance
FormatPROGRESSIVE
Pacing audio0.01s Calibrated
Standardized testing protocol
45 seconds of running followed by 15 seconds of passive recovery. Speed increases by 0.5 km/h (6.25m) per level, starting at 10.0 km/h (125m).
Required field equipment
Running track or field, cones marked at 6.25m intervals, Time4Test audio soundtrack
Calculation formula & scoring
Time4Test automates this equation directly during the session:
Highest maximum speed achieved on the last fully completed level represents intermittent MAP.
Scientific reference
Gacon, G. (1994, 2004). Test 45-15 FIT. Validated in multiple studies including Buchheit et al.
Execute in Time4Test
Calibrated acoustic audio cues, live split recording, and instant automated calculation on your smartphone.
Download on Google Play