Accelerations*

Formula

(0.5s > 3.0 m/s2) & (> 10.0 km/h).

Description
The number of accelerations performed in a match or training session. An acceleration is counted when it is at least 3.0 m/s2 for 0.5 seconds and has to reach at least 10.0 km/h (=2.778 m/s) within the acceleration cycle that starts and stops at 0.5 m/s2.

Decelerations*

Formula
(0.5s > 3.0 m/s2) & (> 10.0 km/h).

Description
The number of decelerations performed in a match or training session. A deceleration is counted when it is at least 3.0 m/s2 for 0.5 seconds and has to start from at least 10.0 km/h (=2.778 m/s) within the acceleration cycle that starts and stops at 0.5 m/s2.

* Dependent on the (type of) measurement system used to collect the data (i.e. video tracking, GPS, LPM). The accuracy of accelerations & decelerations can differ and therefore these measures need to be used with caution, especially when comparing such data collected with different measurement systems. For example, see Buchheit et al. (2014, JSS; 2014, IJSPP).

Distance in Speed Zones

The distance covered within each speed zone (0-7, 7-15, 15-20, 20-25, 25+ km/h). The distance is accumulated from the moment the player is within the speed thresholds for each zone.

Max Speed

The maximum distance covered by the player within 1 second during the session, expressed in km/h. The max speed has to be reached in a sprint with a max valid speed of 36 km/h and a max valid acceleration of 9 m/s2, in order to eliminate possible measurement artefacts.

Runs & HI-runs

The number of runs or high-intensity runs (HI-runs) performed in a match or training session. A run is counted when it is at least 1.0 second above 15.0 km/h; a HI-run when it is at least 1.0 second above 20.0 km/h. Both start at 15.0 km/h and stop when it is below 15.0 km/h for 0.1 seconds.

Sprints

The number of sprints performed in a match or training session. A sprint is counted when it is at least 1.0 second above 25.0 km/h. Like runs and HI-runs, a sprint starts at 15.0 km/h and stops when it is below 15.0/h for 0.1 seconds.

Time (on Field) / Minutes Played

Total time that the player was on the field during the match (including when the ball was dead).

Total Distance

Total distance covered during (a part of) the match or training session, expressed in per meters or kilometres.

The above-mentioned variables are mainly used in our Physical Reports which are explained here:

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