Table 1. The activities of glutathione related enzyme systems in red blood cells and plasma levels of muscle originated enzymes before and after the 80-km ride in four endurance horses. Values are means (± SEM). The level of significance is set at p < 0.05, paired samples t-test.
Pre After 80 km ride
Glutathione peroxidase (µmol·mg-1 Hb-1·min-1) .43 (.06) .53 (.03)
Glutathione reductase (nmol·mg-1 Hb-1·min-1) 1.84 (.15) 1.66 (.13)
Glutathione-S-transferase(µmol·mg-1Hb-1·min-1) .020(.002) .020 (.002)
Creatine kinase (U·l-1) 275 (43) 568 (137)
Aspartate aminotransferase (U·l-1) 387 (13) 423 (35)