How it is calculated
The four criteria are acceleration above 3.0 m/s², deceleration above 3.0 m/s², speed above the sprint threshold, and metabolic power above 25.5 W/kg.
The app slides a five-second window through the session. When three or more criteria are met, it counts one event and moves past it, so one effort is not counted twice.
How to read it
HIE counts the moments when several kinds of hard effort happen together. Events per minute lets you compare drills and matches of different lengths.