Physical working capacity (PWC) and maximum oxygen consumption (VO2max) depend on athlete's sports activity. Average amount of PWC for qualified athletes in cyclic kinds of sports activity is 1586+/-339.8 kgm/min (21.8+/-0.638 kgm/min kg), endurance-trained athlete's PWC is 1625+/-359 kgm/min (23.1+/-4.1 kgm/min kg) and speed-power trained athlete's PWC is 1418+/-214 kgm/min (20.3+/-2.76 kgm/min kg). The study of athletes' physical working capacity by PWC170 test allows estimating physical preparation of athletes' organism, but its high indices may not be in straight connection with their sports achievements. Physical working capacity researchers are more objective when they are carried out by four moment PWC170 test compare to standard two moment PWC170 test. The study of PWC170 among preschool children allows including corrections in their motion regime. During the process of training high-qualified athletes' PWC170 can increase compared to hemodynamic indices. Maximum oxygen consumption--VO2max is in straight correlation as with end systolic and diastolic function, as well as with left ventricle mass. As bigger is left ventricle mass as higher are VO2max indices. The study of PWC by specific tests allows determining aerobic-anaerobic and aerobic working capacity among high-qualified wrestlers.