EFEITO DO TREINAMENTO AERÓBICO E ANAERÓBICO SOBRE AS CONCENTRAÇÕES DO HORMÔNIO DO CRESCIMENTO EM RATOS SUBMETIDOS A EXERCÍCIO FÍSICO

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Generally, all the functions of the human body and the vertebrate ones as well, are controlled by the nervous and endocrine system that work on an integrated form, providing stability to the internal and external environment of the body, through the various homeostatic mechanisms. The general aim of this work was to verify the effects of different types of physical training about the concentrations of growth hormones on rats submitted to physical exercises. For the study was used 46 male Wistar rats, with 8 weeks old and initial average weight of 198,48 (9,69)g were distributed into 3 groups: control group (GC, n=14), trained aerobically (GTA, n=20) and anaerobically trained group (GTF, n=12). To determine the muscular work the group GTF performed the test of a maximum repetition (1RM). The anaerobic training was performed for 12 weeks with three weekly sessions, using 3 series of 10 repetitions on crouching equipment using a charge of 75% of 1RM, weekly readjusted. The aerobic training, also performed for 12 weeks, with three weekly sessions, consisted of a rodent treadmill using a progressive protocol, on speeds of 25 to 30 m.min-1 with varied timing of 10 to 45 minutes and a constant inclination of 1,5%. After three months of training, the animals of the three groups were submitted to an acute protocol of maximum aerobic exercises, that consisted of ran to exhaustion, over a rodent treadmill, at a speed of 10 m.min-1 and 0% of inclination, followed by a gradual increase on each 4 minutes on the speed and inclination until reaching a maximum of 30 m.min-1 of speed and 10% of inclination. After the training cycle, plasmatic levels of GH through lab techniques of biochemical determination were determined on all groups (GC, GTF, GTA), on two distinct moments. The first one on repose (interval of 48 hours without exercise) and second one after the maximum acute aerobic exercise was performed. The statistic treatment used was Test t of Student for dependable samples when comparisons among groups and Analysis of Variance (ANOVA one way) took place, when the comparisons were among groups. Statistic differences werent found on the concentration of the GH on the first assessment among the three groups. A quite meaningful reduction statistics was evident on the concentration of the GH after the maximum acute aerobic exercise was performed when compared with the values on repose on the first assessment on the groups GC and GTF. The group that performed aerobic training after being submitted to maximum acute aerobic exercise didnt show any meaningful change in the concentration of the GH compared with the values in repose on the first assessment. It may be understood that the maximum acute aerobic exercise didnt provoke changes on the liberation of the GH on aerobically trained animals, but it was capable of provoking a reduction on secretion of GH on anaerobically trained animals and in the control group.

ASSUNTO(S)

rato, treinamento anaeróbico exercise anaerobic training gh treinamento aeróbico gh aerobic training exercícios medicina rats

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