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Revista Cubana de Investigaciones Biomédicas
versão impressa ISSN 0864-0300versão On-line ISSN 1561-3011
Resumo
CABRERA ROJO, Iliana; CABRERA SANTOS, Anastasio e GALLARDO MONTES DE OCA, Gerardo. Variabilidad de la frecuencia cardíaca en el joven normal. Rev Cubana Invest Bioméd [online]. 1997, vol.16, n.2, pp.98-103. ISSN 0864-0300.
The variability of heart rates is a means to explore the influence of the autonomous nervous system on the heart. The objective of this paper was to study such variability in a normal young individual in supine position, orthostasis, and when there are changes of the respiratory rate. 1 200 heart cycles were registered among 27 clinically normal subjects (19 ± years) in supine decubitus position and during orthostasis by using an automated system. A deep breathing test was applied. The anatomy and function of the heart were studied by echocardiogram. The results showed a mean heart rate of 70 ± 8.64 beats/min in the supine decubitus position and a standard deviation of the RR' intervals of 131.44 ± 53.65 ms. On being standing, the heart rate increased significantly (69.33 vs 86.44 beats/min, p < 0.00002), whereas the mean RR'interval and the standard deviation decreased. On doing the deep breathing test, it was observed a rise of the heart rate during inspiration and a reduction in the time of expiration. It is concluded that during orthostasis there is a decrease of the heart rate variability by sympathetic action, and that the deep breathing test reveals a sympathetic predominance in the inspiration and a vagal predominance in the expiration.
Palavras-chave : HEART RATE [physiology]; POSTURE; RESPIRATION; ECHOCARDIOGRAPHY; BREATH TESTS.