TY - JOUR

T1 - Features of hemodynamics of pulmonary circulation during the diving reflex

AU - Podyacheva, Ekaterina

AU - Zemlyanukhina, Tatyana

AU - Shadrin, Lavrentij

AU - Baranova, Tatyana

N1 - Publisher Copyright: Copyright: © 2020 Podyacheva et al. This is an open-access article distributed under the terms of the License Agreement with Saint Petersburg State University, which permits to the authors unrestricted distribution, and self-archiving free of charge. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2020/10

Y1 - 2020/10

N2 - The adaptive cardiovascular reactions of the human diving reflex were studied. The diving reflex was activated by submerging a face in cold water under laboratory conditions. Forty volunteers (aged 18–24) were examined. ECG, arterial blood pressure (ABP) and central blood flow were recorded by the impedance rheography method in resting state, during diving simulation (DS) and after apnea. During DS there is a statistically significant decrease in the dicrotic index (DCI), which reflects a decrease in the resistive vessel tone and as well as diastolic index (DSI), characterizing lung perfusion. A comparison of the latent periods (LP) of an increase in ABP and a drop in DCI showed that a decrease in pulmonary vascular tone develops faster than ABP begins to increase. The LP for lowering DCI is from 0.6 to 10 s; for an increase in ABP — from 6 to 30 s. A short LP for DCI and the absence of a correlation between a decrease in ABP and DCI suggests that a decrease in pulmonary vascular tone during DS occurs reflexively and independently of a change in ABP.

AB - The adaptive cardiovascular reactions of the human diving reflex were studied. The diving reflex was activated by submerging a face in cold water under laboratory conditions. Forty volunteers (aged 18–24) were examined. ECG, arterial blood pressure (ABP) and central blood flow were recorded by the impedance rheography method in resting state, during diving simulation (DS) and after apnea. During DS there is a statistically significant decrease in the dicrotic index (DCI), which reflects a decrease in the resistive vessel tone and as well as diastolic index (DSI), characterizing lung perfusion. A comparison of the latent periods (LP) of an increase in ABP and a drop in DCI showed that a decrease in pulmonary vascular tone develops faster than ABP begins to increase. The LP for lowering DCI is from 0.6 to 10 s; for an increase in ABP — from 6 to 30 s. A short LP for DCI and the absence of a correlation between a decrease in ABP and DCI suggests that a decrease in pulmonary vascular tone during DS occurs reflexively and independently of a change in ABP.

KW - Diving reflex

KW - Impedance rheography

KW - Plethysmography

KW - Pulmonary circulation

KW - Systemic circulation

UR - http://www.scopus.com/inward/record.url?scp=85094147713&partnerID=8YFLogxK

U2 - 10.21638/SPBU03.2020.304

DO - 10.21638/SPBU03.2020.304

M3 - Article

AN - SCOPUS:85094147713

VL - 65

SP - 244

EP - 251

JO - Biological Communications

JF - Biological Communications

SN - 2542-2154

IS - 3

ER -