Table 1.

Antioxidant enzymes activities and glutathione status in human skeletal muscle before and after 6 weeks of endurance training

	Pretraining	Posttraining	Significance
SOD
Mitochondrial	373 ± 28	386 ± 33	n.s.
Cytosolic	1003 ± 23	910 ± 42	n.s.
Total	1376 ± 16	1296 ± 62	n.s.
GPX	964 ± 46	1003 ± 84	n.s.
GSH	1576 ± 146	1352 ± 95	n.s.
GSSG	97 ± 45	146 ± 38	n.s.
GSH+GSSG	1770 ± 113	1645 ± 71	n.s.

Values are means ±s.e.m. (30 °C); n= 8. SOD, superoxide dismutase (kU (kg wet wt)⁻¹); GPX, glutathione peroxidase (U (kg wet wt)⁻¹); GSH, reduced glutathione (μmol (kg wet wt)⁻¹); GSSG, glutathione disulfide (μmol (kg wet wt)⁻¹); GSH+2GSSG, total glutathione (μmol (kg wet wt)⁻¹).