Cardiorespiratory Reactions During Submaximal Exercise in Humans after 14-Day Simulated Lunar Gravity

A. A. Puchkova; Пучкова А. А.; A. V. Shpakov; Шпаков А. В.; V. P. Katuntsev; Катунцев В. П.; D. M. Stavrovskaya; Ставровская Д. М.; G. K. Primachenko; Примаченко Г. К.

doi:10.31857/S0131164623600350

Cardiorespiratory Reactions During Submaximal Exercise in Humans after 14-Day Simulated Lunar Gravity

Authors: Puchkova A.A.¹, Shpakov A.V.¹^,2, Katuntsev V.P.¹, Stavrovskaya D.M.¹, Primachenko G.K.¹
Affiliations:
1. Institute of Biomedical Problems of the RAS
2. Federal Science Center of Physical Culture and Sport (VNIIFK)
Issue: Vol 49, No 6 (2023)
Pages: 41-50
Section: Articles
URL: https://rjmseer.com/0131-1646/article/view/664083
DOI: https://doi.org/10.31857/S0131164623600350
EDN: https://elibrary.ru/DFRFXU
ID: 664083

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Abstract

The paper presents main results of a study on the influence of the physiological effects of simulated lunar gravity on cardiorespiratory responses to exercise in humans. Twelve healthy male volunteers aged 19–31 years (M ± SD: 22.5 ± 4.0 years) took part in the study. They were under 14-day head-up bed rest at +9.6° angle (HUBR) relative to the horizon as a model for the physiological effects of lunar gravity. Cardiopulmonary exercise testing (CPET) was performed 7 days before the onset of HUBR and on the next day after the end of the experimental exposure. A 3-stage cycle ergometer test with 5-minute platforms at 125, 150, and 175 watts was used as a CPET protocol. Exposure of subjects to simulated lunar gravity reduced their tolerance to physical load. This was indicated by more pronounced changes for such parameters of cardiorespiratory system as heart rate, minute ventilation of the lungs, ventilatory equivalents for oxygen and carbon dioxide, as well as a less pronounced increase in oxygen consumption and oxygen pulse during CPET after 14 days of exposure to HUBR.

Keywords

cardiorespiratory system, physical performance, cardiopulmonary exercise testing, head-up bed rest, lunar gravity.

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