Abstract:
The aims of this study were to investigate the effect of various doses of sucrose ingestion on forearm blood flow in men who were offspring of hypertensive parents (OHT) and offspring of normotensive parents (ONT) and to determine the relationship between plasma glucose levels and oxidative stress. Healthy men (OHT = 16, ONT = 16) were participated in four sessions. Each session, participants ingested one of four concentrations of sucrose solution (200 mL solution containing 0, 15, 30, and 60 grams of sucrose) at random order. Peak forearm blood flow (peak FBF) was assessed before and every 30 minutes after sucrose ingestion for 2 hours. Plasma glucose, insulin levels, and oxidative stress markers (protein carbonyl; PC and total antioxidant capacity; TAC) were tested before and at 30, 60, and 120 minutes after sucrose ingestion. The results showed that peak FBF at baseline of OHT group was significantly lower than ONT group (22.40±1.17 vs 25.23±0.62 mL/100mLtissue/min, P < 0.0001). In both groups, peak FBF of all sessions significantly decreased when compared to baseline (P < 0.05 for all comparisons). Plasma glucose and serum insulin levels in both groups significantly increased at 30 minutes after sucrose ingestion (P < 0.05) and returned to baseline afterward. PC and TAC in both groups were not significantly change in any time points (P > 0.05). In both OHT and ONT groups, ingesting less than 60 grams of sucrose impairs vasodilating function. There was no correlation between plasma glucose and oxidative stress.