Gender dependency of circadian blood pressure and heart rate profiles in spontaneously hypertensive rats: effects of beta‐blockers
This study investigated (i) blood pressure (BP), heart rate (HR), and their relation to urinary NOx and eNOS protein expression in male and female spontaneously hypertensive rats (SHR), as well as (ii) gender‐dependent cardiovascular effects of nebivolol (NEB) in comparison to metoprolol (MET) in SH...
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| Main Authors: | , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
2006
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| In: |
Chronobiology international
Year: 2006, Volume: 23, Issue: 4, Pages: 813-829 |
| ISSN: | 1525-6073 |
| DOI: | 10.1080/07420520600827129 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1080/07420520600827129
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| Author Notes: | Christina Grundt, Kirsten Meier, and Björn Lemmer |
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| 520 | |a This study investigated (i) blood pressure (BP), heart rate (HR), and their relation to urinary NOx and eNOS protein expression in male and female spontaneously hypertensive rats (SHR), as well as (ii) gender‐dependent cardiovascular effects of nebivolol (NEB) in comparison to metoprolol (MET) in SHR. BP and HR were measured telemetrically after a single intraperitoneal application of NEB or MET at 07.00 and 19.00 h in male rats and at 19.00 h in proestrus female rats. The two β‐blockers varied in time of decreasing BP and HR and also in duration. In males, MET decreased BP and HR for few hours exclusively when applied at the onset of the activity phase (i.e., at 19.00 h), while after its application at 07.00 h, BP and HR were unchanged. In females, MET also caused a short‐lasting BP and HR reduction, with the effect being more pronounced than in males. In males, NEB at either dosing time decreased HR and BP to a greater extent than did MET. This effect was evident both during the activity and rest periods and persisted for at least five days. In females, NEB provoked a similar, but more pronounced, effect on BP and HR in comparison to males. These findings demonstrate that significant gender‐dependent differences in the circadian profile of BP and HR exist. BP and urinary NOx as well as eNOS expression are inversely correlated, and the cardiovascular effects of NEB and MET vary, depending on the time of application as well as gender. | ||
| 650 | 4 | |a Circadian blood pressure and heart rate rhythm | |
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| 650 | 4 | |a Spontaneously hypertensive rats | |
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