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

Guohui Liu, Xiaopeng Liu, Zhifeng Qin, Zhao Gu, Guiyou Wang, Weiru Shi, Dongqing Wen, Lihua Yu, Yongchang Luo and Huajun Xiao
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Guohui Liu: School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
Xiaopeng Liu: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
Zhifeng Qin: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
Zhao Gu: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
Guiyou Wang: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
Weiru Shi: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
Dongqing Wen: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
Lihua Yu: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
Yongchang Luo: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China
Huajun Xiao: High Altitude Physiology Laboratory, Institute of Aviation Medicine, Air Force, Beijing 100142, China

IJERPH, 2015, vol. 12, issue 9, 1-16

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 CO 2 . Methods: The study utilized a hypobaric chamber set to the following specifications: 3800 m altitude with 25% O 2 and different CO 2 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% O 2 and 5.0% CO 2 (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.

Keywords: heart rate variability; heart rate; blood pressure; cardiac autonomic modulation; exercise (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2015
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