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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Guohui Liu & Xiaopeng Liu & Zhifeng Qin & Zhao Gu & Guiyou Wang & Weiru Shi & Dongqing Wen & Lihua Yu & Yongchang Luo & Huajun Xiao, 2015. "Cardiovascular System Response to Carbon Dioxide and Exercise in Oxygen-Enriched Environment at 3800 m," IJERPH, MDPI, vol. 12(9), pages 1-16, September.
    • Handle: RePEc:gam:jijerp:v:12:y:2015:i:9:p:11781-11796:d:55992
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