Cardiovascular System Response to Carbon Dioxide and Exercise in Oxygen-Enriched Environment at 3800 m
| Autor: | Yu Lihua, Shi Weiru, Gu Zhao, Wen Dongqing, Zhi-feng Qin, Guohui Liu, Wang Guiyou, Liu Xiaopeng, Xiao Huajun, Yong-chang Luo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Adult
Male medicine.medical_specialty Health Toxicology and Mutagenesis lcsh:Medicine chemistry.chemical_element Oxygen Article Cardiovascular Physiological Phenomena Young Adult chemistry.chemical_compound Animal science Altitude Internal medicine Heart rate medicine heart rate Humans Heart rate variability exercise cardiac autonomic modulation lcsh:R Public Health Environmental and Occupational Health heart rate variability blood pressure Carbon Dioxide Effects of high altitude on humans Endocrinology Blood pressure chemistry Hypobaric chamber Carbon dioxide |
| Zdroj: | International Journal of Environmental Research and Public Health Volume 12 Issue 9 Pages 11781-11796 International Journal of Environmental Research and Public Health, Vol 12, Iss 9, Pp 11781-11796 (2015) |
| ISSN: | 1660-4601 |
| DOI: | 10.3390/ijerph120911781 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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