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Table 4 Pulse interval (PI) variability in time and frequency domains in sedentary control rats (C, n = 8); trained control rats (TC, n = 8); sedentary rats submitted to myocardial infarction (I, n = 9), trained rats submitted to myocardial infarction (TI, n = 10)

From: Cardioprotection afforded by exercise training prior to myocardial infarction is associated with autonomic function improvement

Parameters/Groups

C

TC

I

TI

SD (ms)

11.1 ± 0.8

10.1 ± 1.2

9.0 ± 0.8

10.7 ± 1.4

Variance (ms2)

116.5 ± 17.2

132.6 ± 25.9

23.2 ± 3.7*

107.8 ± 21.8†

RMSSD (ms2)

6.6 ± 0.2

6.7 ± 0.7

4.3 ± 0.2*

8.4 ± 0.6†

LF (%)

26.7 ± 2.6

20.0 ± 1.9

14.9 ± 1.4*

27.3 ± 3.3†

HF (%)

73.2 ± 2.7

82.8 ± 3.2

85.1 ± 1.4

72.6 ± 3.3

LF/HF

0.38 ± 0.05

0.26 ± 0.03

0.18 ± 0.02*

0.39 ± 0.06†

  1. Values are expressed as mean ± SEM. SD - standard deviation of the PI variability; RMSSD - root-mean square of differences of successive RR intervals; LF – low frequency band; HF – high frequency band; LF/HF – autonomic balance. ANOVA two-way (exercise training and myocardial infarction) analysis followed by the Bonferroni post-test. *p < 0.05 vs. C; †p < 0.05 vs. I.
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BMC Cardiovascular Disorders

ISSN: 1471-2261

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