Contextually, we consider that, by developing aerobic capacity through the adjustment of rest intervals, swimmers have the possibility to perform mechanical work over a longer period of time, thus delaying the depletion of the energy supplies available in the muscle cells. In these conditions, the body will gradually diminish the effects of the residual substances accumulated as a result of tissue metabolism, even during effort, generally through the buffer systems and the mechanisms for the removal of effort-induced catabolites (Costill, 1978).