Fig. 3.

l-Arginine improves glucose tolerance in Europid men only. After placebo (white circles/bars) and l-arginine supplementation (black circles/bars), up to 120 min after ingestion of 75 g of dextrose, plasma glucose (a, b) and insulin excursions (d, e) were assessed in Europid and South Asian men. The AUC was calculated using the trapezoidal rule for glucose (c) and insulin (f). Data are presented as mean ± SEM (a, b, d, e) or as mean ± SD (c, f). *p < 0.05 and **p < 0.01 for placebo vs l-arginine; ^†p = 0.07 and ^‡p = 0.08 for placebo vs l-arginine