“…The total number of athletes was about 333 males and females, aged between 17 and 40 years, who practiced different sports (running, cycling, swimming, canoeing, athletics, skating, volleyball, football, basketball, rugby, and triathlon). For the sample characterization, seven studies used the VO 2 as a physiological measure, seven studies reported the length of time that the athletes had practiced the sport (over 2 years), and eight studies selected athletes participating in national, regional, or international competitions . No study reported the athlete's training phase during the course of the experiment.…”