IdentificaÃÃo dos limiares de lactato, glicÃmico e ventilatÃrio e efeitos da intensidade do exercÃcio resistido sobre a glicemia em diabÃticos tipo-2

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The aim of this study were: 1) to identify the incidence and compare the lactate (LT), glycemic (IGT) and ventilatory thresholds (VT) in cycle ergometer, as well as the lactate (LT)and glycemic thresholds (GT) in resistance exercise in type 2 diabetics; 2) to correlate the thresholds on cycle ergometer with the thresholds determined on resistance exercises; 3) to verify the effects of resistance exercise intensity on blood glucose response. The subjects that participated on cycle ergometer study were 19, (17 type 2 diabetics and 2 insulin resistance subjects - 54.9Â12.6 years; 83.3Â17,4 kg). Additionally 9 male subjects (47.2Â12.4 years; 87.6Â20 kg) participated in the resistance exercise study. At the first were measured the biometric profiles, maximal oxygen consumption (VO2mÃx), the maximal load test (1RM), fasting blood glucose, blood pressure, time of illness and kind of treatment used. An incremental test in cycle ergometer with increments (15 Watts) at each 3 minutes, as well as an incremental test in leg press and bench press exercises with stages of 30 repetitions 10/20/25/30/35/40/50/60/70/80 and 90% 1RM) were applied. Moreover, a constant-load tests (3 circuit with 6 exercise) below (23%1RM) and above (43%1RM) the lactate and glycemic thresholds and a control session were randomly performed. During the incremental tests, as well as during 120 minutes after the constant-load tests, blood lactate, blood glucose, ventilatory parameters, heart rate and rating of perceived exertion were measured. A descriptive statistic treatment was applied. The ANOVA with Tukey post-hoc for parametric data and a FRIEDMAN test for non parametric data were used to analyze the results. In the constant-load tests, the area under the curve were considered for comparison. A polynomial function and linear regression equation were used to mathematically determine the thresholds intensities. The Pearsonâs correlation was applied as will with a significant level of p<0.05. The results evidenced the possibility to identify the IGT in type 2 diabetics, with no difference and a high correlation with LT, VT, LTLac/W and VTVE/W. Moreover it was possible to determine the LT and GT in leg press and bench press both from visual and polynomial methods. No differences were verified between thresholds intensities were observed (30 to 36% 1RM). A high correlation was observed between LT determined in resistance exercises with the thresholds identified from blood lactate and ventilatory parameters in cycle ergometer. Other important results were the non pharmological control of blood glucose for type 2 diabetics in the resistance exercise performed with 23% 1RM when compared to control session over the 75 minutes post exercise (p<0,05). We concluded that there were no significant differences among lactate, glycemic and ventilatory thresholds determined on type 2 diabetics from different protocols in cycle ergometer, as well as between ic thresholds determined on resistance exercise. Additionally, the thresholds in aerobic and resistance exercises were correlated each other. Finally, a resistance exercise session performed at 23% 1RM (below the LT and GL) resulted in a more significant decrease in blood glucose in type 2 diabetics both during and post resistance exercises.

ASSUNTO(S)

efeito agudo acute effects capacidade aerÃbia aerobic capacity resistido educacao fisica aerobic and resistance exercise diabetes tipo-2 exercÃcio aerÃbio diabetes; glicemia; exercÃcio aerÃbico type 2 diabetes

ACESSO AO ARTIGO

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