Table 1.

Biochemical parameters for glycemic homeostasis and antioxidant status in triathletes before (baseline) and after 20 days of organic grape juice intake (n = 10).

	Baseline	After grape juice intake
Glucose (mg/dl)	89.4±8.9	67.1±11.2*
Insulin (µU/ml)	13.3±2.7	16.9±3.7*
HOMA2-IR	1.7± 0.1	1.9±0.4
Uric acid (µmol/l)	0.3±0.07	0.4±0.06*
E-SOD (U/mg protein)	27.8±6.3	24.3±2.5*
Plasma polyphenols (mg of galic acid/ml)	0.2±0.03	0.3±0.04*

* p≤0.05 by paired t-test. HOMA2-IR: homeostasis model assessment for insulin resistance; E-SOD: superoxide dismutase activity in erythrocytes.