Table 1 Frequency and time domain variability results of the systolic interval (SI) from HS, HS-Unload and respective control groups.

From: Chronic high-sodium diet intake after weaning lead to neurogenic hypertension in adult Wistar rats

 

Cont 12 W

HS

Cont 15 W

HS Unload

Mean ± SEM

n

Mean ± SEM

n

p

Mean ± SEM

n

Mean ± SEM

n

p

HR (bpm)

383 ± 12

(9)

381 ± 11

(10)

0.8894

386 ± 16

(8)

375 ± 11

(8)

0.5674

RMSSD (ms)

5.9 ± 0.5

(9)

4.4 ± 0.4*

(10)

0.0429

6.0 ± 0.9

(8)

3.9 ± 0.3*

(8)

0.0416

VLF (% of total Power)

50 ± 4

(9)

72 ± 4*

(10)

0.0015

50 ± 9.1

(8)

70 ± 4.8

(8)

0.0692

LF (% of total Power)

13 ± 1.3

(9)

12 ± 1.6

(10)

0.7011

16 ± 3.2

(8)

15 ± 2.3

(8)

0.7776

HF (% of total Power)

31 ± 3.3

(9)

14 ± 3.2*

(10)

0.0014

31 ± 7.0

(8)

13 ± 2.9*

(8)

0.0348

LF/HF ratio

0.46 ± 0.07

(9)

1.30 ± 0.33*

(10)

0.0316

0.74 ± 0.19

(8)

1.32 ± 0.17*

(8)

0.0413

  1. SI data were acquired from 4,000 to 4,500 consecutive heart beats using the pulsatile blood pressure signal (approximately 10 minutes of continuous recording). Very low frequency (VLF), low frequency (LF) and high frequency (HF) bands ranged from 0.0 to 0.2 Hz, 0.2 to 0.75 Hz and 0.75 to 2.50 Hz respectively. RMSSD = root mean square of the successive differences was used to assess time-domain heart rate (HR) variability. Total Power density was measured as µs2. *Different of respective control group; unpaired t-test; p < 0.05.
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