Résumé
This chapter describes the heat-related issues of importance for physical and technical/cognitive performance in soccer and its associated influence on match-play characteristics. For each parameter it discusses the underlying physiological mechanisms and subsequently provides guidelines for preparing players and highlights the factors coaches and the medical staff should considerer before, during and after match play in the heat. The chapter provides brief recommendations to minimize the detrimental effects of heat on fatigue development and hence benefit soccer physical performance when playing in hot ambient conditions. Heat acclimatization is the most important intervention to adopt prior to competing in the heat to reduce the physiological strain and optimize performance. Sufficient hydration prior to, during and in the recovery period is integral to athlete performance and safety during training and competition in the heat. Given the limited opportunity to drink during matches, players should be cautious to initiate games in euhydrated state, while permissive dehydration is acceptable during matches and training.