Purpose: Climate conditions are significant modifiers of soccer players` physiological and psychomotor responses to exercise (Nassis et al.. 2015). The study aimed at finding relationships between players` physiological, biochemical and psychomotor parameters during incremental exercise, and climate conditions for the 2022 FIFA World Cup in Qatar simulated in an environmental test chamber. Methods: The study sample will comprise 24 male soccer players aged 17-18 years. The players will carry out an incremental exercise test on a Cybex 790T treadmill. The measured variables will include lactate, acid-base homeostasis, serotonin, arterial-blood gas levels and heart rate. The players will also take a psychomotor test before and after exercise. The measurements will be taken twice in an environmental test chamber (NITROXYcell, Wichary Technologies): 1) in thermo-neutral conditions (20.5°C. 58.7% RH); and 2) in conditions typical for 21st November in Doha. Qatar (day and place of the 2022 World Cup inauguration) (28.5 ± 1.92°C. 58.7 ± 8.64% RH). The study will be conducted in June 2018 and funded from the National Science Center grant no. 379162 Expected results: Significant differences in players` physiological and biochemical parameters and psychomotor skills in thermo-neutral conditions and in Qatar climate conditions are expected (Chmura et al.. 2017). During a soccer match the ambient temperature does affect players` body internal temperature, and overheating may reduce the level of players` psychomotor skills, movement speed and precision, and concentration (Mohr et al.. 2012). According to Grantham et al.. (2010) playing soccer in the ambient temperature of 22°C does not incur a risk of body overheating. This risk is low in the temperature range of 22 - 28X. and high at above 28°C. Conclusion: Data on players` responses to exercise in climatic conditions of the planned 2022 FIFA World Cup in Qatar should be used by coaches in their player preparation programs.
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