ABSTRACT
Tennis is a popular sport played worldwide and year round by boys, girls, men, and women. Tennis is one of the few sports that players can continue to compete in as they get older. Modern technology and highly conditioned athletes have made tennis a game of power. Tennis involves short-term, highly intense, stopping and starting movements interspersed with periods of rest. Singles tennis is classified as essentially utilizing the nonaerobic energy system followed closely by the anaerobic system. Tennis is played in a variety of climatic settings. Players often compete outdoors in sweltering conditions. During changeovers, tennis players can also take advantage of ingesting fluids on a regular basis. Professional tennis players who used creatine have reported overheating and the inability to cool down during a tennis match. Technological advances in tennis racquets and better physical conditioning of participants have increased the power and speed at which the sport of tennis is played.
