The goal of this research is to determine whether statistically significant differences exist between three various methods for determining the anaerobic threshold, i.e. differences in heart frequencies with regard to the anaerobic threshold (FSanp-1, FSanp-2, FSanp-3) pertaining to a swimmers` progressive test. The variable sample consisted of basic anthropometric variables, as well as a set of variables for the evaluation of functional abilities in 13 Croatian triathletes: maximum heart frequency, maximum speed, maximum lactates, anaerobic threshold FS (intersection method "4mmol/l", "D-max method"), anaerobic threshold lactates (intersection method "4mmol/l""D-max method").The subjects swam a progressive discontinuous test of 7 x 200 meters, the same being used to measure cardiovascular and metabolic responses to swimming speed increase applying the front crawl technique. In order to determine statistically significant differences between various methods used to establish the anaerobic threshold of the subjects, the t-test was used for dependent samples. In the course of this research, the "Intersection" method and the "D-max method" have proven to be a reliable means in assessing the anaerobic threshold.
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