Air temperature and humidity affect the motor activity of soccer players during matches. Analysis of soccer players` motor activity in extreme environmental conditions enables optimal players` preparation. Aim of Study: The study aims to assess changes in motor performance of soccer players in different environmental conditions. Material and Methods: The participants were soccer players taking part in the 2014 World Cup matches in Brazil. The authors used the Castrol Performance Index motion analysis system for data recording. Results: Higher air temperature reduces the performance of exercise with medium (p = 0.05) and high intensity (p = 0.01); while higher humidity has a significant positive impact on the distance covered by players with medium intensity (p = 0.05). The total number of performed sprints becomes significantly lower in higher air temperature and humidity (p = 0,05). Conclusions: Soccer training should emphasize high- intensity exercise as well as short-lasting and explosive exercise since the environmental conditions have a greater impact on players` speed skills than endurance skills.
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