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. 2013 Oct 7;13:104. doi: 10.1186/1471-2318-13-104

Table 3.

Enzyme activity and hydrogen peroxide levels in aging skeletal muscle

	Age (months)
	*6 (n =* 16)**	*12 (n =* 18)**	*18 (n =* 12)**	*24 (n =* 12)**
SOD1 (U/mg protein)	19.4 ± 1.3	9.1 ± 0.3^acd	30.8 ± 2.5^abd	25.9 ± 1.3
SOD2 (U/mg protein)	5.7 ± 0.5	5.7 ± 0.4	4.7 ± 0.3	3.4 ± 0.1^ab
GPx (U/mg protein)	1.0 ± 0.2	1.1 ± 0.1^a	0.7 ± 0.1^abd	0.9 ± 0.2
Catalase (U/mg protein)	9.3 ± 0.9	12.1 ± 1.2^a	8.8 ± 1.2^bd	10.2 ± 0.9
Hydrogen Peroxide (μM)	1.12 ± 0.07	1.16 ± 0.04	2.42 ± 0.05^abd	1.74 ± 0.06
Superoxide (AFU)	8.1 ± 1.3	8.0 ± 0.3	8.9 ± 1.1	10.0 ± 0.6^ab

The values represent the mean ± SEM.

Statistically significant differences (P < 0.05) between groups are indicated by lower case letters, where ^a6 m/o, ^b12 m/o, ^c18 m/o and ^d24 m/o.