Features of hemodynamics of pulmonary circulation during the diving reflex

  • Ekaterina Podyacheva Department of General Physiology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0002-0365-3301
  • Tatyana Zemlyanukhina Department of General Physiology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0003-2651-8521
  • Lavrentij Shadrin Department of Physical Culture and Sports, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0003-0199-4417
  • Tatyana Baranova Department of General Physiology, Faculty of Biology, Saint Petersburg State University, Universitetskaya nab., 7–9, Saint Petersburg, 199034, Russian Federation https://orcid.org/0000-0003-0524-2933

Abstract

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.

Keywords:

diving reflex, systemic circulation, pulmonary circulation, impedance rheography, plethysmography

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Published
2020-10-01
How to Cite
Podyacheva, E., Zemlyanukhina, T., Shadrin, L., & Baranova, T. (2020). Features of hemodynamics of pulmonary circulation during the diving reflex. Biological Communications, 65(3), 244–251. https://doi.org/10.21638/spbu03.2020.304
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