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Adaptive Changes in the Indicators of Systemic Hemodynamics and Energy Consumption by Young Men during Passive Hyperthermia Procedures

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Abstract—

Adaptive shifts in systemic hemodynamic parameters and energy consumption were evaluated in 15 healthy young men in response to a single procedure of passive hyperthermia (PH) and during a course of ten such procedures. PH procedures with a duration of 40 min were performed in an infrared body heating capsule at 65–80°C, with the head remaining outside the capsule. Heart rate, blood pressure, and SрО2 were analyzed. Oxygen and energy consumption were measured by indirect calorimetry. The sweating rate and the physiological strain index (PSI) were calculated. It was found that PH procedures were accompanied by an increase in energy consumption (in comparison with placebo procedures), but without a pronounced stress response of systemic hemodynamics. PSI values during PH corresponded to moderate heat stress. During the course, adaptive shifts occurred in the form of a decrease in energy consumption and an increase in the sweating rate. In the tenth procedure the relationship between the degree of increase in body temperature and the level of energy consumption was revealed.

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ACKNOWLEDGMENTS

We are grateful to all the volunteers who participating in the study, as well as Sybaritic Inc. (United States) for the Alfa Basic thermal capsules provided free of charge for hyperthermic procedures. The company and its representatives were not involved in the study design, data collection, analysis and interpretation, and preparation of the publication.

Funding

This work was in part supported by the Russian Foundation for Basic Research, project no. 19-013-00465 A “Direct and Crossover Effects of Adaptation to Systemic Hyperthermia: Influence on the Quality of Life, Neurohormonal and Psychophysiological Status of a Person.”

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Authors and Affiliations

  1. Sechenov First Moscow State Medical University (Sechenov University), Moscow, Russia

    S. Yu. Kryzhanovskaya, M. A. Zapara, E. N. Dudnik & O. S. Glazachev

  2. Volgograd State Medical University, Volgograd, Russia

    L. K. Gavrikov

Authors
  1. S. Yu. Kryzhanovskaya
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  2. M. A. Zapara
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  3. E. N. Dudnik
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  4. L. K. Gavrikov
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  5. O. S. Glazachev
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Corresponding authors

Correspondence to S. Yu. Kryzhanovskaya or O. S. Glazachev.

Ethics declarations

All procedures performed in studies involving human participants were in accordance with the biomedical ethics principles formulated in the 1964 Helsinki Declaration and its later amendments and approved by the local bioethical committee of the Sechenov First Moscow State Medical University (Sechenov University) (Moscow).

Conflict of interests. The authors declare that they have no conflict of interest.

Informed consent. Each study participant provided a voluntary written informed consent signed by him after explaining to him the potential risks and benefits, as well as the nature of the upcoming study.

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Translated by E. Babchenko

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Kryzhanovskaya, S.Y., Zapara, M.A., Dudnik, E.N. et al. Adaptive Changes in the Indicators of Systemic Hemodynamics and Energy Consumption by Young Men during Passive Hyperthermia Procedures. Hum Physiol 48, 161–169 (2022). https://doi.org/10.1134/S0362119722020104

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  • DOI: https://doi.org/10.1134/S0362119722020104

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