Table 3.

Baroreflex gain during light and dark cycles in HCR-M, LCR-M, HCR-F, and LCR-F rats

Main Effect	P Value	HCR-M	LCR-M	HCR-F	LCR-F
Number of rats/group		8	9	8	8
Number of sequences
Light
Strain	0.923	18.8 ± 2.56	17.3 ± 2.82	27.1 ± 4.83	25.2 ± 3.61
Sex	0.057
Interaction	0.868
Dark
Strain	0.183	17.8 ± 1.95c	15.9 ± 1.66	30.6 ± 3.53	21.7 ± 2.95b
Sex	0.004
Interaction	0.419
Gain all, ms/mmHg
Light
Strain	0.382	2.43 ± 0.158	2.23 ± 0.247	2.26 ± 0.277	2.06 ± 0.306
Sex	0.737
Interaction	0.882
Dark
Strain	0.133	2.32 ± 0.199	1.92 ± 0.175	2.06 ± 0.231	1.75 ± 0.278
Sex	0.653
Interaction	0.898
Up sequences, ms/mmHg
Light
Strain	0.146	2.33 ± 0.163	2.10 ± 0.170	2.42 ± 0.254	1.93 ± 0.250
Sex	0.986
Interaction	0.722
Dark
Strain	0.035	2.36 ± 0.163	1.91 ± 0.129	2.16 ± 0.206	1.72 ± 0.254
Sex	0.610
Interaction	0.841
Down sequences, ms/mmHg
Light
Strain	0.606	2.46 ± 0.167	2.29 ± 0.310	2.10 ± 0.314	2.14 ± 0.365
Sex	0.668
Interaction	0.834
Dark
Strain	0.272	2.22 ± 0.234	1.89 ± 0.215	1.98 ± 0.247	1.74 ± 0.302
Sex	0.762
Interaction	0.930

Values are means ± SE. Parameters shown include the number of sequences identified, gain of all identified sequences (gain all), gain of reflex bradycardia (systolic blood pressure and interpulse interval increase; up sequences), and reflex tachycardia (systolic blood pressure and interpulse interval decrease; down sequences). Comparisons are across groups.

^bP < 0.05, HCR-F vs. LCR-F;

^cP < 0.05, HCR-M vs. HCR-F.