ABSTRACT
The purpose of this study was to physiologically evaluate performance on a 400 m freestyle race with consideration of the aerobic-anaerobic relation to swimming velocity. The subjects were 21 male and 26 female swimmers who participated at the 1993 Pan Pacific Swimming Championships in Kobe, Japan. The velocity was evaluated by using the aerobic/anaerobic velocity model. This model included aerobic velocity and fatigue effect. The third root of exponential function for course of time was used as a parameter of aerobic velocity. Further, a linear function for course of time was applied to a parameter of fatigue effect. During the race, the aerobic power contributed 57.98±1.94% of the total energy expenditure for males and 56.35±3.14% for females. Though anaerobic energy contributed primarily only during the first stage of race, there was no significant correlation between the anaerobic velocity during this phase and the average velocity of the entire race. It was noteworthy that a high relation existed between aerobic velocity and total velocity during the mid stage portion of the race. A correlation for male (r = 0.454, p< 0.01) between the average velocity of the entire race and the anaerobic velocity during the last stage was contrasted with the value for female (r = – 0.130, NS.).
