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Table 2 Spectral power analysis of the heart rate (HR) 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 bpm2/Hz 4.0 ± 1.3 6.3 ± 1.2 4.6 ± 1.1 3.3 ± 1.4 NS
VLF bpm2/Hz (0–0.26 Hz) 2.8 ± 0.5 2.8 ± 0.5 2.3 ± 0.4 1.7 ± 0.6 NS
LF bpm2/Hz (0.26–0.76 Hz) 0.5 ± 0.2 1.0 ± 0.2 0.6 ± 0.2 0.5 ± 0.2 NS
HF bpm2/Hz (0.76–3.3 Hz) 0.7 ± 0.1 2.5 ± 1.1 1.8 ± 0.7 1.1 ± 0.4 NS
LF:HF 0.7 ± 0.1 0.6 ± 0.1 0.5 ± 0.1 0.6 ± 0.1 NS
VLF % (HR) 68.1 ± 7.6 55.0 ± 7.1 53.3 ± 6.6 53.4 ± 8.4 NS
LF % (HR) 12.0 ± 2.2 15.0 ± 2.0 12.6 ± 1.9 15.4 ± 2.4 NS
HF % (HR) 11.6 ± 6.8 29.9 ± 6.3 34.6 ± 5.9 31.2 ± 7.5 NS
  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, NS non-significant