https://sondasports.com/blog/soccer-tracker-improve-your-teams-performance/
...There are several types of soccer trackers. One of the first to be introduced were cameras with an optical sensor. They were responsible for following a player throughout the game to record his basic statistics. Not only did they mark his route and the “heat zone”, but they were also able to recognize tackles, shots at goal, passes, etc. ...
...Today, most GPS soccer tracking systems include a GPS tracker, Heart Rate Monitor, and an application gathering and combining the measured data.
The information we gather using such systems can be divided into three important sections. The first includes biological data, consisting of internal factors such as the heart rate, oxygen and fatigue, as well as measurements of values such as lactic acid and others. These measurements can be performed for example, by tracking the High Metabolic Distance using GPS soccer trackers. ...