Artículos de revistas
Heart rate variability in the tegu lizard, Salvator merianae, its neuroanatomical basis and role in the assessment of recovery from experimental manipulation
Fecha
2020-02-01Registro en:
Comparative Biochemistry and Physiology -Part A : Molecular and Integrative Physiology, v. 240.
1531-4332
1095-6433
10.1016/j.cbpa.2019.110607
2-s2.0-85074895828
Autor
Universidade Federal de São Carlos (UFSCar)
University of Birmingham
Universidade Federal da Bahia (UFBA)
Universidade Estadual Paulista (Unesp)
FAPESP/CNPq
Institución
Resumen
Using long-term, remote recordings of heart rate (fH) on fully recovered, undisturbed lizards, we identified several components of heart rate variability (HRV) associated with respiratory sinus arrhythmia (RSA): 1.) A peak in the spectral representation of HRV at the frequency range of ventilation. 2.) These cardiorespiratory interactions were shown to be dependent on the parasympathetic arm of the autonomic nervous system. 3.) Vagal preganglionic neurons are located in discrete groups located in the dorsal motor nucleus of the vagus and also, in a ventro-lateral group, homologous to the nucleus ambiguus of mammals. 4.) Myelinated nerve fibers in the cardiac vagus enabling rapid communication between the central nervous system and the heart. Furthermore, the study of the progressive recovery of fH in tegu following anesthesia and instrumentation revealed that ‘resting’ levels of mean fH and reestablishment of HRV occurred over different time courses. Accordingly, we suggest that, when an experiment is designed to study a physiological variable reliant on autonomic modulation at its normal, resting level, then postsurgical reestablishment of HRV should be considered as the index of full recovery, rather than mean fH.