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Table 3 Spectral power analysis of the SBP and sBRG in normotensive intact and gonadectomised rats

From: Impact of gonadectomy on blood pressure regulation in ageing male and female rats

Variable F-INTACT (n = 7) F-GONADX (n = 7) M-INTACT (n = 8) M-GONADX (n = 5) Two-way ANOVA
TP mmHg2/Hz 0.24 ± 0.03 0.27 ± 0.03 0.21 ± 0.03 0.32 ± 0.03 Sham < GONADX*
VLF mmHg2/Hz (0–0.26 Hz) 0.06 ± 0.02 0.09 ± 0.02 0.09 ± 0.02 0.11 ± 0.02 NS
LF mmHg2/Hz (0.26–0.76 Hz) 0.09 ± 0.02 0.12 ± 0.02 0.06 ± 0.02 0.12 ± 0.02 Sham < GONADX*
HF mmHg2/Hz (0.76–3.3 Hz) 0.08 ± 0.01 0.07 ± 0.01 0.05 ± 0.01 0.08 ± 0.01 Sex*GONADX**
LF:HF 1.1 ± 0.2 1.7 ± 0.2 1.6 ± 0.2 1.5 ± 0.2 Sex*GONADX P = 0.08
VLF % (SBP) 25.7 ± 5.3 30.6 ± 5.3 43.3 ± 4.4 35.8 ± 5.3 F < M*
LF % (SBP) 36.8 ± 4.0 42.5 ± 4.0 34.3 ± 3.4 37.9 ± 4.0 NS
HF % (SBP) 37.5 ± 3.4 26.9 ± 3.4 22.4 ± 2.8 26.3 ± 3.4 F > M*; Sex*GONADX*
Respiratory rate 24 h (breath per min) 96.3 ± 3.7 91.8 ± 4.0 76.5 ± 3.2 78.1 ± 4.0 F > M***
sBRG (+) 1.1 ± 0.1 1.2 ± 0.1 1.3 ± 0.1 1.5 ± 0.1 F < M*
sBRG (−) −1.5 ± 0.2 −1.8 ± 0.1 −1.9 ± 0.2 −2.3 ± 0.2 F < M*
  1. Data analysed by Spike2 v 8.02c (CED, Cambridge, UK). The two-way ANOVA assessed the effect of sex steroids and surgery, with Tukey HSD post hoc analysis. Data are presented as mean ± SEM
  2. TP total spectrum power, VLF very low frequency spectrum, LF low-frequency spectrum, HF high-frequency spectrum, SBP systolic blood pressure, sBRG (+) positive ramp of spontaneous baroreflex gain, sBRG (−) negative ramp of spontaneous baroreflex gain, NS non-significant
  3. *P < 0.05; **P < 0.01;***P < 0.001