The purpose of this study was to determine the lactate minimum intensity (LMI) by swimming LACmintest using three incremental stages (LACmintest3) and to evaluate its sensitivity to changes in aerobic fitness (AF). Twenty Wistar rats performed: LACmintest3 (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 LACmintest3 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 LACmintest3 seems to be a good indicator of LMI and responsive to changes in AF in rats subjected to swim training.
Resumo O objetivo deste estudo foi verificar a cinética de lactato sanguíneo (CLS) e a sua resposta ao treinamento físico combinado (TFC) bem como avaliar os efeitos sobre os aspectos bioquímicos, imunológicos, cardiorrespiratório e composição corporal de pessoas vivendo com HIV/AIDS. Doze voluntários HIV+ realizaram o TFC, por um período de 16 semanas, e foram submetidos às avaliações nos momentos pré, oito e 16 semanas de TFC. Ao final, houve um aumento das células TCD4+ e manutenção da carga viral, aumento do consumo máximo de oxigênio e da força muscular e, ainda, aumento do HDL-c e diminuição dos triglicerídeos e glicemia de jejum. Ainda, ocorreu aumento da CLS após o período de treinamento. Concluímos que o TFC influenciou positivamente os parâmetros imunológicos, bioquímicos, cardiorrespiratório e muscular, no entanto, a questão relacionada à CLS necessita de estudos futuros para maiores esclarecimentos.
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