Blood lactate minimum of rats during swimming test using three incremental stages

Lactato sanguíneo mínimo de ratos durante teste de natação usando três etapas incrementais

Lactato sanguíneo mínimo de ratas durante la prueba de natación con tres pasos incrementales

Abstract

The purpose of this study was to determine the lactate minimum intensity (LMI) by swimming LACmin_test using three incremental stages (LACmin_test3) and to evaluate its sensitivity to changes in aerobic fitness (AF). Twenty Wistar rats performed: LACmin_test3 (1): induction of hyperlactacidemia and incremental phase (4%, 5% and 6.5% of bw); Constant loads tests on (2) and above (3) the LMI. Half of the animals were subjected to training with the individual LMI and the tests were performed again. The mean exercise load in LACmin_test3 was 5.04 ± 0.13% bw at 5.08 ± 0.55 mmol L^-1 blood lactate minimum (BLM). There was a stabilize and disproportionate increase of blood lactate in tests 2 and 3, respectively. After the training period, the mean BLM was lower in the trained animals. The LACmin_test3 seems to be a good indicator of LMI and responsive to changes in AF in rats subjected to swim training.

Keywords:
minimum blood lactate test; three incremental stages; rats; swimming