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Int. J. Environ. Res. Public Health 2015, 12(9), 11781-11796; doi:10.3390/ijerph120911781

Cardiovascular System Response to Carbon Dioxide and Exercise in Oxygen-Enriched Environment at 3800 m

1
School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
2
High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Paul B. Tchounwou
Received: 27 May 2015 / Revised: 5 August 2015 / Accepted: 6 August 2015 / Published: 18 September 2015
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Abstract

Background: This study explores the responses of the cardiovascular system as humans exercise in an oxygen-enriched room at high altitude under various concentrations of CO2. Methods: The study utilized a hypobaric chamber set to the following specifications: 3800 m altitude with 25% O2 and different CO2 concentrations of 0.5% (C1), 3.0% (C2) and 5.0% (C3). Subjects exercised for 3 min three times, separated by 30 min resting periods in the above-mentioned conditions, at sea level (SL) and at 3800 m altitude (HA). The changes of heart rate variability, heart rate and blood pressure were analyzed. Results: Total power (TP) and high frequency power (HF) decreased notably during post-exercise at HA. HF increased prominently earlier the post-exercise period at 3800 m altitude with 25% O2 and 5.0% CO2 (C3), while low frequency power (LF) changed barely in all tests. The ratios of LF/HF were significantly higher during post-exercise in HA, and lower after high intensity exercise in C3. Heart rate and systolic blood pressure increased significantly in HA and C3. Conclusions: Parasympathetic activity dominated in cardiac autonomic modulation, and heart rate and blood pressure increased significantly after high intensity exercise in C3. View Full-Text
Keywords: heart rate variability; heart rate; blood pressure; cardiac autonomic modulation; exercise heart rate variability; heart rate; blood pressure; cardiac autonomic modulation; exercise
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Liu, G.; Liu, X.; Qin, Z.; Gu, Z.; Wang, G.; Shi, W.; Wen, D.; Yu, L.; Luo, Y.; Xiao, H. Cardiovascular System Response to Carbon Dioxide and Exercise in Oxygen-Enriched Environment at 3800 m. Int. J. Environ. Res. Public Health 2015, 12, 11781-11796.

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