Abstract
Changes in external respiration and central hemodynamics induced by negative (relative to atmospheric) inspiration pressure were studied in supine subjects before and on the fourth day of a dry immersion (DI) experiment. Changes in the cardiorespiratory system as a result of negative inspiration pressure included an increase in the amplitude of breathing motions and reduction of their frequency, and distinct breathing-related HR fluctuations. Combinations of immersion and altered pressure in the mask caused breathing-related variations of systolic pressure and plethysmogram signal, and improved arterial blood oxygenation. These results could be useful for developing pressure-gradient methods of counteracting adverse effects of blood redistribution toward the cranial end.
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Original Russian Text © Yu.S. Semenov, Yu.A. Popova, A.I. Diachenko, G.D. Reushkina, V.I. Kolesnikov, A.V. Suvorov, 2011, published in Aviakosmicheskaya i Ekologicheskaya Meditsina, 2011, Vol. 45, No. 6, pp. 37–40.
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Semenov, Y.S., Popova, Y.A., Diachenko, A.I. et al. Characteristics of the effect of negative pressure inspiration on the cardiorespiratory system of humans under the conditions of five-day dry immersion. Hum Physiol 40, 748–751 (2014). https://doi.org/10.1134/S0362119714070238
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DOI: https://doi.org/10.1134/S0362119714070238