Analysis of Renal Sympathetic Nerve Responses to Stress
| Autor: | Gerald F. DiBona, S Y Jones |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
Male
medicine.medical_specialty Sympathetic nervous system Sympathetic Nervous System Baroreceptor Baroreflex Kidney Species Specificity Stress Physiological Rats Inbred SHR Internal medicine Heart rate Internal Medicine medicine Animals Sodium Chloride Dietary Electrodes Cardiac cycle business.industry Pathophysiology Rats Autonomic nervous system Endocrinology medicine.anatomical_structure Hypertension Female business |
| Zdroj: | Hypertension. 25:531-538 |
| ISSN: | 1524-4563 0194-911X |
| DOI: | 10.1161/01.hyp.25.4.531 |
| Popis: | Abstract We studied sympathetic nerve activity responses to acute environmental stress (air jet stress) in conscious Wistar-Kyoto, spontaneously hypertensive, and borderline hypertensive rats. The borderline hypertensive rats were fed either 1% (normotensive) or 8% (hypertensive) NaCl. Renal sympathetic nerve activity responses were analyzed with three methods: mean integrated voltage over time, power spectrum analysis, and sympathetic peak detection analysis. Measurements of mean integrated voltage over time showed that air jet stress increased renal sympathetic nerve activity in spontaneously hypertensive rats and in borderline hypertensive rats on 8% NaCl but not in the other groups. In the NaCl responders, power spectrum analysis of renal sympathetic nerve activity indicated that the increase in relative power was at the heart rate frequency, indicating that it was related to renal sympathetic nerve discharge coupled to the cardiac cycle. Sympathetic peak detection analysis of renal sympathetic nerve activity indicated that there was an increase in frequency of sympathetic peaks of greater height and shorter duration because of sinoaortic baroreceptor deactivation (increased peak frequency) and the recruitment of more active fibers (greater peak height) firing with greater synchronization (shorter peak duration). Additional methods of analysis of renal sympathetic nerve activity provide information in addition to that derived from measurement of mean integrated voltage over time. |
| Databáze: | OpenAIRE |
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