| Full text | |
| Author(s): |
Armelin, Vinicius A.
;
da Silva Braga, Victor H.
;
Teixeira, Mariana T.
;
Guagnoni, Igor N.
;
Wang, Tobias
;
Florindo, Luiz H.
Total Authors: 6
|
| Document type: | Journal article |
| Source: | OURNAL OF EXPERIMENTAL ZOOLOGY PART A-ECOLOGICAL AND INTEGRATIVE PHYSIOLOG; v. 335, n. 3, p. 11-pg., 2021-01-27. |
| Abstract | |
The most commonly used technique to study the barostatic regulation of blood pressure in ectothermic vertebrates consists of determining the heart rate response to pharmacological manipulations of blood pressure, the so-called "Oxford method." Although well established, the Oxford method has some important limitations, such as induction of hypervolemia in small animals and undesired effects of vasoactive drugs on central and peripheral baroreflex components. As an alternative, the sequence method, which consists in the computerized evaluation of naturally-occurring baroreflex adjustments of heart rate without the need for pharmacological administrations, was developed to study baroreflexes. In the present study, we compare this sequence method with the Oxford technique in two teleost species with different life styles, and we assess the optimal software configuration for the employment of the sequence method in fish. Calculation of baroreflex gain through the sequence method was adequate and reliable when the software was configured to search for baroreflex sequences with a minimum length of three cardiac cycles with a delay of one cardiac cycle between fluctuations in mean ventral aortic blood pressure and reflex changes in pulse interval. When properly configured, the sequence and the Oxford methods yielded similar determinations of the baroreflex gain in fish. (AU) | |
| FAPESP's process: | 16/17572-5 - The parasympathetic cardiac modulation in the Tambaqui(Colossoma macropomum): The unequal influences of the right and left vagus nerve |
| Grantee: | Victor Hugo da Silva Braga |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 08/57712-4 - The National Institute of Comparative Physiological Research |
| Grantee: | Augusto Shinya Abe |
| Support Opportunities: | Research Projects - Thematic Grants |