Table 1 Indices of heart rate variability (HRV) and systolic blood pressure variability (SBPV) in spontaneously hypertensive rats before and after short-duration (SD) or long-duration (LD) carotid sinus stimulation

From: The ability of baroreflex activation to improve blood pressure and resistance vessel function in spontaneously hypertensive rats is dependent on stimulation parameters

 

Control (n = 9)

Stimulated SD (n = 9)

Stimulated LD (n = 8)

p Value

Before

After

Before

After

Before

After

HRV

SDNN, ms

6.2 ± 1.0

6.1 ± 1.0

4.8 ± 0.5

5.2 ± 0.6

4.8 ± 0.4

5.7 ± 1.1

ns

RMSSD, ms

3.5 ± 0.5

3.1 ± 0.4

3.3 ± 0.6

3.6 ± 0.7

2.8 ± 0.3

3.2 ± 0.7

ns

SBPV

SDNN, mmHg

7.8 ± 0.6

7.9 ± 0.7

7.8 ± 0.5

7.3 ± 0.5

7.2 ± 0.6

7.8 ± 1.5

ns

Spontaneous baroreflex

BEI

0.3 ± 0.0

0.3 ± 0.0

0.3 ± 0.0

0.4 ± 0.0

0.4 ± 0.0

0.3 ± 0.0

ns

Gain, ms.mmHg−1 

1.1 ± 0.2

1.2 ± 0.3

0.8 ± 0.2

0.8 ± 0.1

0.8 ± 0.1

0.9 ± 0.2

ns

  1. Time-domain analysis: standard deviation (SDNN) and root mean square of successive differences of normal PI (RMSSD). Spontaneous baroreflex analysis: Baroreflex effectiveness index (BEI) and Gain (ms. mmHg−1). Results are presented as mean ± standard error of mean (SEM). p-Value: not significant (ns)
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