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Table 1 Characteristics and population distribution of the four types of baroreceptor fibres classified by their response curves (see Fig. 2)

From: The relationship between aortic baroreceptor activity and arterial pressure is not monotonic

Type

Number

Percentage

Pth (mmHg)

Fth (Hz)

Pmax (mmHg)

Fmax (Hz)

Gain (Hz/mmHg)

A

83

48

52 ± 10

0

130 ± 13

59 ± 22

0.76 ± 0.28

B

38

22

54 ± 16

13 ± 13

135 ± 12

71 ± 21*

0.72 ± 0.29

C

20

12

54 ± 12

0

133 ± 9

60 ± 23

0.76 ± 0.29

D

32

18

56 ± 12

22 ± 16‡,$

132 ± 12

62 ± 17

0.54 ± 0.21**

Never silent (B and D)

70

40

     

Display nadir (C and D)

52

30

     

Total/mean

173

 

54 ± 12

7 ± 13

132 ± 12

63 ± 21

0.7 ± 0.3

  1. Primary features of response curves of aortic baroreceptor fibres from the left ADN, grouped (types A, B, C, D; see Fig. 2). Values for fibre characteristics are presented as the mean ± SD
  2. Pth Pressure threshold at which activity increases, Fth firing rate at Pth, Pmax pressure at which firing rate reaches a maximum, Fmax maximum firing rate, gain mean slope of the response curve between Pth and Pmax
  3. * Significantly different from A; P < 0.01
  4. ** Significantly different from A, B and C; P < 0.01
  5. Significantly different from A and C; P < 0.01
  6. $Significantly different from B; P < 0.05