摘要：Soccer, as one of the most popular modern sports, is played in many countries around the world, not only at a competitive level but also as a very popular recreational sports game. Soccer referees are an integral part of the soccer game.Their job is to regulate the behavior of players and other participants through the implementation of soccer rules.In addition to the principal referee who makes the final decision on the ground, there are 3 assistant referees that may assist in game regulation. To make the most correct decision, the referee must be at the right place and have an overview of the situation which requires excellent physical condition, visual perception, mental ability, focus, willingness and ability to make quick decisions. During competitive games, referees pass a total of 9-13 km with varying levels of intensity, but approximately at the level of 85 to 90% of the maximal heart rate and respectively 70 to 80% of the maximal oxygen consumption. Blood lactate concentration is between 4 and 5 mmol / l, but the recorded values were as high as 14 mmol / l. All this leads to the fact that they are subjected to high levels of exertion that can sometimes even exceed those that the players endure.
