Table 2.

Systolic and diastolic indexes by MRI

		Groups
Parameter	P Value (by ANOVA)	SDC	R2C	R2 LSp	R2 Sp
n		6	7	5	5
Age at MRI, wk old	ND	8.3 ± 0.3	8.9 ± 0.3	7.9 ± 0.4	8.4 ± 0.2
Heart rate and cardiac volumes
Heart rate, beats/minute	ND	387 ± 18	364 ± 17	396 ± 12	373 ± 8
End-diastolic volume, μl	ND	448 ± 32	537 ± 40	427 ± 28	508 ± 23
End-systolic volume, μl	ND	128 ± 11	177 ± 19	145 ± 18	133 ± 18
Systolic indexes
Cardiac index, ml·min−1·g body wt−1	ND	0.51 ± 0.05	0.49 ± 0.04	0.42 ± 0.02	0.54 ± 0.03
Ejection fraction, %	ND	71 ± 3	67 ± 2	67 ± 2	74 ± 3
Diastolic indexes
Diastolic relaxation time, ms	0.001	19.4 ± 3.4*	39.9 ± 2.9	23.3 ± 3.9*	32.1 ± 5.2
Peak filling rate, μl/s	ND	8.18 ± 0.46	8.27 ± 1.03	6.94 ± 0.44	7.94 ± 0.56
Initial filling rate, μl/s	0.001	6.34 ± 0.61*	2.87 ± 0.54	5.24 ± 0.49*	5.90 ± 0.67*

Values are means ± SE; n, sample size. ND indicates that no differences were observed in the ANOVA main effect.

^*P < 0.05 vs. the R2C group.