Efeitos de diferentes intensidades de exercÃcio resistido sobre as respostas hemodinÃmicas em indivÃduos diabÃticos tipo 2 e nÃo diabÃticos

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Physical exercise, when prescribed in a proper intensity, is very important in the prevention and/or non pharmacological treatment of high blood pressure, which is common among type-2 diabetics (D). The decrease in blood pressure (BP) after exercise, below pre-exercise rest values, known as post-exercise hypotension (PEH), has been verified after both aerobic and resistance exercise. Lactate threshold (LT) is a parameter that can be used in exercise prescription, but little is known about its determination and application in resistance exercise performed by D, and its possible effects on BP after resistance exercise for this population. Objective: To analyze and compare BP kinetics after resistance exercise performed at intensities relative to LT by D and non-diabetic (ND) individuals. Methods: 8 D (46,6+13,1 years) and 8 ND (52,0+13,2 years) subjects attended 6 visits: 1) cardiologic evaluation; 2) maximal workload test (1MR) in the leg press, bench press, leg extension, pull down, leg flexion and row exercises; 3) incremental test (30rep. at 10, 20, 25, 30, 35, 40, 50, 60 and 70% of 1MR; 2-min rest between series), adapted form Barros et al. (2004), in the leg press and bench press in order to visually determine the LT; 4) circuit (3x16 rep. 30s rest between exercises and 2-min rest between each circuit lap) performed above LT (43% 1MR); 5) circuit (3x30 rep. 45s between exercises and 2-min rest between each circuit lap) performed below LT (23% 1MR), in the same exercises where the 1MR test was performed, alternating between upper and low body; 6) control session â seated rest, without exercise. BP measurements and 25mL blood collection from the ear lobe for lactate analysis were performed at pre-exercise rest, after each stage of the incremental test, between the circuit laps and at 15, 30, 45, 60, 75, 90, 105 and 120 min of post-exercise recovery (r), and at the correspondent moments in the control session. ANOVA with a Bonferroni post-hoc was employed for statistical analysis. Results: Resistance exercise performed above LT (43% 1MR) promoted PEH (P<0.05) of SBP and MBP in some moments of recovery, both for D and for ND. No significant decreases in DBP were observed in relation to rest. At the intensity below LT (23% 1MR), no PEH was observed for the studied populations. Comparing the two populations (D and ND) no significant differences were observed between them. After exercise at 23% and 43% 1MR, lower SBP, DBP and MBP values were observed in relation to the control session. Conclusion: Resistance exercise performed at a intensity above LT (43% 1MR) in a circuit manner resulted in a significant decrease of SBP and MBP for D and ND, without significant differences between the two groups.

ASSUNTO(S)

lactate threshold limiar de lactato exercÃcio resistido exercÃcios fÃsicos;hipotensÃo;diabetes educacao fisica post-exercise hypotension resistance exercise hipotensÃo pÃs-exercÃcio type-2 diabetics diabetes tipo 2

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