Table 2.

Plasma gamma-glutamyl transferase (GGT) and creatine kinase (CK) activity in NACQ- and placebo-supplemented horses. Differences in superscripts a and b indicate significant differences with supplementation or exercise. There were no significant effects of NACQ/placebo supplementation, however there was a significant effect of exercise on GGT (p = 0.008 and CK activities (p < 0.001).

	GGT (U/L)	CK (U/L)
	Mean ± Sd	Mean ± Sd
Placebo Pre	18.7 ± 6.0 a	190.0 ± 44.3 a
Placebo 4 h Post	25.0 ± 8.0 b	446.1 ± 171.2 b
NACQ Pre	20.0 ± 7.2 a	278.4 ± 151.4 a
NACQ 4 h Post	22.6 ± 5.7 b	387.4 ± 146.2 b