Cardiorespiratory function, resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplace
Background Owing to intermittent/acute exposure to hypobaric hypoxia, highland miners may often suffer, the physiological characteristics between highland and lowland miners, however, are rarely reported. The objective of this study was to compare the physiological characteristics of coal miners wor...
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PeerJ Inc.
2022-08-01
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| author | Sanjun Yang Chunhu Tian Fan Yang Qi Chen Ruiyuan Geng Chunyan Liu Xinrong Wu Wing-Kai Lam |
| author_facet | Sanjun Yang Chunhu Tian Fan Yang Qi Chen Ruiyuan Geng Chunyan Liu Xinrong Wu Wing-Kai Lam |
| author_sort | Sanjun Yang |
| collection | DOAJ |
| description | Background Owing to intermittent/acute exposure to hypobaric hypoxia, highland miners may often suffer, the physiological characteristics between highland and lowland miners, however, are rarely reported. The objective of this study was to compare the physiological characteristics of coal miners working at disparate altitudes. Methods Twenty-three male coal mining workers acclimating to high altitude for 30 ± 6 days in Tibet (highland group; approx. 4500 m above sea level; 628.39 millibar), and 22 male coal mining workers in Hebei (lowland group; less than 100 m above sea level; 1021.82 millibar) were recruited. Tests were conducted to compare ventilatory parameters, circulation parameters, resting metabolic rate (RMR), and heart rate variability (HRV) indices between the two groups in resting state. Results Ventilation volume per minute (VE) of the highland group was markedly raised compared to that of the lowland group (11.70 ± 1.57 vs. 8.94 ± 1.97 L/min, p = 0.000). In the meanwhile, O2 intake per heart beat (VO2/HR) was strikingly decreased (3.54 ± 0.54 vs. 4.36 ± 0.69 ml/beat, p = 0.000). Resting metabolic rate relevant to body surface area (RMR/BSA) was found no significant difference between the two groups. Evident reduction in standard deviation of NN intervals (SDNN) and remarkable increase in ratio of low- and high- frequency bands (LF/HF) were manifest in highland miners compared to that of lowland ones (110.82 ± 33.34 vs. 141.44 ± 40.38, p = 0.008 and 858.86 ± 699.24 vs. 371.33 ± 171.46, p = 0.003; respectively). Conclusions These results implicate that long-term intermittent exposure to high altitude can lead miners to an intensified respiration, a compromised circulation and a profound sympathetic-parasympathetic imbalance, whereas the RMR in highland miners does not distinctly decline. |
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| language | English |
| last_indexed | 2024-03-09T08:01:18Z |
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| spelling | doaj.art-e5ab361bbf28443c9b3cd07bce5460702023-12-03T00:42:45ZengPeerJ Inc.PeerJ2167-83592022-08-0110e1389910.7717/peerj.13899Cardiorespiratory function, resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplaceSanjun Yang0Chunhu Tian1Fan Yang2Qi Chen3Ruiyuan Geng4Chunyan Liu5Xinrong Wu6Wing-Kai Lam7Department of Physical Education, China University of Mining and Technology-Beijing, Beijing, ChinaDepartment of Physical Education, China University of Mining and Technology-Beijing, Beijing, ChinaSports Science Research Center, Li Ning Center, Beijing, ChinaThe University of International Business and Economics, Beijing, ChinaDepartment of Physical Education, China University of Mining and Technology-Beijing, Beijing, ChinaThe Third Affiliated Hospital of Beijing University of Chinese Medicine, Beijing, ChinaSchool of Emergency Management and Safety Engineering, China University of Mining and Technology-Beijing, Beijing, ChinaSports Information and External Affairs Centre, Hong Kong Sports Institute, Sha Tin, Hong Kong, ChinaBackground Owing to intermittent/acute exposure to hypobaric hypoxia, highland miners may often suffer, the physiological characteristics between highland and lowland miners, however, are rarely reported. The objective of this study was to compare the physiological characteristics of coal miners working at disparate altitudes. Methods Twenty-three male coal mining workers acclimating to high altitude for 30 ± 6 days in Tibet (highland group; approx. 4500 m above sea level; 628.39 millibar), and 22 male coal mining workers in Hebei (lowland group; less than 100 m above sea level; 1021.82 millibar) were recruited. Tests were conducted to compare ventilatory parameters, circulation parameters, resting metabolic rate (RMR), and heart rate variability (HRV) indices between the two groups in resting state. Results Ventilation volume per minute (VE) of the highland group was markedly raised compared to that of the lowland group (11.70 ± 1.57 vs. 8.94 ± 1.97 L/min, p = 0.000). In the meanwhile, O2 intake per heart beat (VO2/HR) was strikingly decreased (3.54 ± 0.54 vs. 4.36 ± 0.69 ml/beat, p = 0.000). Resting metabolic rate relevant to body surface area (RMR/BSA) was found no significant difference between the two groups. Evident reduction in standard deviation of NN intervals (SDNN) and remarkable increase in ratio of low- and high- frequency bands (LF/HF) were manifest in highland miners compared to that of lowland ones (110.82 ± 33.34 vs. 141.44 ± 40.38, p = 0.008 and 858.86 ± 699.24 vs. 371.33 ± 171.46, p = 0.003; respectively). Conclusions These results implicate that long-term intermittent exposure to high altitude can lead miners to an intensified respiration, a compromised circulation and a profound sympathetic-parasympathetic imbalance, whereas the RMR in highland miners does not distinctly decline.https://peerj.com/articles/13899.pdfMinersHighlandResting stateCardiorespiratory functionResting metabolic rateHeart rate variability |
| spellingShingle | Sanjun Yang Chunhu Tian Fan Yang Qi Chen Ruiyuan Geng Chunyan Liu Xinrong Wu Wing-Kai Lam Cardiorespiratory function, resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplace PeerJ Miners Highland Resting state Cardiorespiratory function Resting metabolic rate Heart rate variability |
| title | Cardiorespiratory function, resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplace |
| title_full | Cardiorespiratory function, resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplace |
| title_fullStr | Cardiorespiratory function, resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplace |
| title_full_unstemmed | Cardiorespiratory function, resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplace |
| title_short | Cardiorespiratory function, resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplace |
| title_sort | cardiorespiratory function resting metabolic rate and heart rate variability in coal miners exposed to hypobaric hypoxia in highland workplace |
| topic | Miners Highland Resting state Cardiorespiratory function Resting metabolic rate Heart rate variability |
| url | https://peerj.com/articles/13899.pdf |
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