This study aimed to compare the swimming velocities at lactate and glucose thresholds, as well as to analyse their relationships. Eight trained swimmers performed in front crawl a 200m steps intermittent incremental test and a lactate minimum test. Lactate and glucose concentrations were identified at rest, during the intervals and at the end of the tests to compute the lactate/velocity and glucose/ velocity curves, and asses the corresponding lactate and glucose thresholds swimming velocities. Paired Student`s t-test, Cohen`s d, Pearson correlation and linear regression were applied for a p < 0.05. Lactate and glucose thresholds swimming velocities obtained in intermittent incremental and lactate minimum tests were different (1.46 ± 0.16 vs. 1.41 ± 0.15 m·s-1 and 1.42 ± 0.17 vs. 1.37 ± 0.17 m·s-1, respectively; p < .05), with large and moderate effect size values (respectively). However, lactate and glucosethresholds swimming velocities were highly related in both tests (r = .96; p < .05). Since current data indicate that lactate and glucose thresholds swimming velocities are not coincident, eventually not representing the same physiological boundary, further studies should be warranted to better understand their relations considering their application in swimmers` evaluation and training control.
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