The purpose of the present study was to investigate whether the yintercept of a regression line in the critical velocity concept could be utilized as an index for evaluating anaerobic capacity. Twenty-one welltrained college swimmers performed a maximum effort swim over 50, 100, 200 and 400m for modeling the distance-time (D-T) relationship and measuring peak blood lactate concentration ([La]), and a 30-s allout Wingate Anaerobic Test (WAnT) performed with arms and legs. The y-intercept was significantly related to highest [La], the mean and the peak power of the WAnT performed with both arms and legs. These results suggest that the y-intercept is a valuable index for evaluating anaerobic capacity using a non-invasive method in competitive swimming.
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