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

International Journal of Environmental Research and Public Health

Guohui Liu¹  Xiaopeng Liu²  Zhifeng Qin²  Zhao Gu²  Guiyou Wang²  Weiru Shi²  Dongqing Wen²  Lihua Yu²  Yongchang Luo²  Huajun Xiao² 

[1] School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China; E-Mail:;High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China; E-Mails:

关键词: heart rate variability;    heart rate;    blood pressure;    cardiac autonomic modulation;    exercise;   

DOI  :  10.3390/ijerph120911781

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2015 by the authors; licensee MDPI, Basel, Switzerland.