Table 2.

Effects of acute cold stress on the SOD, GSH-Px activity, and MDA content in heart tissue

	0 h	1 h	3 h	6 h	12 h	24 h
SOD (NU/mg.Pr)	37.854 ± 4.135a	42.439 ± 2.176b	43.042 ± 2.714b	29.498 ± 1.732c	25.449 ± 1.007d	22.764 ± 1.117e
GSH-Px (U/mg.Pr)	1.23 ± 0.107a	2.712 ± 0.204b	3.849 ± 0.211c	1.307 ± 0.113a	0.986 ± 0.032a	0.641 ± 0.025d
MDA (nmol/mg.Pr)	2.432 ± 0.104a	2.527 ± 0.223a	2.986 ± 0.147b	3.076 ± 0.245b	3.647 ± 0.118c	3.749 ± 0.194c

Different lowercase letters indicate significant differences (P < 0.05) between any two means