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Articles de revues sur le sujet « Altitude »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 25 juillet 2025

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1

Tang, Yan Fei, Chao Ding, Ya Ping He, De Chuang Zhou, and Jian Wang. "Studies on the Effect of Altitude on the Flammable Liquids' Flash Point." Advanced Materials Research 908 (March 2014): 345–48. http://dx.doi.org/10.4028/www.scientific.net/amr.908.345.

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Presented in this paper is part of an experimental series conducted at different altitudes to investigate the influence of altitude on the flammable liquids flash point. The BS-1 closed bomb apparatus is used to measure the flash points of two flammable liquids (dimethylacetylamide (DMA) and RP-5 Jet A) in a hypobaric chamber under the altitude change from 4860 km to the sea level. The experimental results show that the flash points of DMA and Jet A decrease linearly with the increase in altitude in the low altitude region below the corresponding critical altitudes but non-linearly above. The

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Nazarali, Samir, Henry Liu, Maleeha Syed, et al. "Aircraft Cabin Pressurization and Concern for Non-Arteritic Anterior Ischemic Optic Neuropathy." Aerospace Medicine and Human Performance 91, no. 9 (2020): 715–19. http://dx.doi.org/10.3357/amhp.5498.2020.

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BACKGROUND: Cabin pressurization is the process by which aircraft maintain a comfortable and safe environment for passengers flying at high altitudes. At high altitudes, most patients can tolerate changes in pressurization; however, passengers at high risk of hypoxia may experience ischemic events. The purpose of this study was to evaluate variations in pressurization of commercial aircraft at cruising altitude and describe its relevance in relation to patients with non-arteritic anterior ischemic optic neuropathy (NAION).METHODS: Altimeters were used to measure altitude and cabin altitude at

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PANKAJ PANWAR, SHARMISTHA PAL, NANCY LORIA, et al. "Spatio-temporal variability of climatic parameters across different altitudes of North- Western Himalaya." Journal of Agrometeorology 21, no. 3 (2021): 297–306. http://dx.doi.org/10.54386/jam.v21i3.252.

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Climate change impact varies across different altitudinal ranges and demands local specific management strategies for water resource and farming system management. The present study analyses spacio-temporal climate parameters across different altitudes of Himachal Pradesh a hilly state of India. Analysis shows that annually, minimum temperature has significantly decreased by -0.09°C at altitude I (350 - 400 m) while maximum temperature has significantly increased by 0.05°C at altitudes I and II (1400-1500 m) and decreased significantly by -0.08°C at altitude III (2000- 2100 m). Higher regions

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Chapman, Robert F., Trine Karlsen, Geir K. Resaland, et al. "Defining the “dose” of altitude training: how high to live for optimal sea level performance enhancement." Journal of Applied Physiology 116, no. 6 (2014): 595–603. http://dx.doi.org/10.1152/japplphysiol.00634.2013.

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Chronic living at altitudes of ∼2,500 m causes consistent hematological acclimatization in most, but not all, groups of athletes; however, responses of erythropoietin (EPO) and red cell mass to a given altitude show substantial individual variability. We hypothesized that athletes living at higher altitudes would experience greater improvements in sea level performance, secondary to greater hematological acclimatization, compared with athletes living at lower altitudes. After 4 wk of group sea level training and testing, 48 collegiate distance runners (32 men, 16 women) were randomly assigned

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Zhu, Lu-lu, Zhi-jun Ma, Ming Ren, et al. "Distinct Features of Gut Microbiota in High-Altitude Tibetan and Middle-Altitude Han Hypertensive Patients." Cardiology Research and Practice 2020 (November 21, 2020): 1–15. http://dx.doi.org/10.1155/2020/1957843.

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Indigenous animals show unique gut microbiota (GM) in the Tibetan plateau. However, it is unknown whether the hypertensive indigenous people in plateau also have the distinct gut bacteria, different from those living in plains. We sequenced the V3-V4 region of the gut bacteria 16S ribosomal RNA (rRNA) gene of feces samples among hypertensive patients (HPs) and healthy individuals (HIs) from 3 distinct altitudes: Tibetans from high altitude (3600–4500 m, n = 38 and 34), Hans from middle altitude (2260 m, n = 49 and 35), and Hans from low altitude (13 m, n = 34 and 35) and then analyzed the GM c

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Wan, Yongkuan, Nana Ding, Tingting Tian, Kun Sun, and Baoli Fan. "Sex-Specific Differences in the Clonality of Hippophae tibetana at Different Altitudes in Alpine Meadows of the Eastern Qinghai–Tibet Plateau." Forests 16, no. 1 (2025): 107. https://doi.org/10.3390/f16010107.

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Dioecious plants have different needs for natural resources due to sex differences, which can lead to skewed sex ratios. Clonal growth facilitates and optimizes resources of clonal plants. So, dioecious plants show inter-sex differences in clonality. However, it is unclear how the clonality varies between female and male plants when they exhibit skewed sex ratios along an altitudinal gradient. Here, we investigated the sex ratio and clonality of Hippophae tibetana populations growing at three altitudes in the alpine meadow. We founded that (i) H. tibetana growing at different altitudes mainly

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Bogar, K., and P. Schatz. "Altitude and Concussions in the NFL: Is There Really a “Mile-High” Effect?" Archives of Clinical Neuropsychology 34, no. 5 (2019): 759. http://dx.doi.org/10.1093/arclin/acz026.29.

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Abstract Purpose The literature on altitude and concussions in football shows some evidence of protective effects of living and training and playing at high altitudes. We explored the likelihood of sustaining concussions within the AFC West division, specifically comparing games hosted at high altitude in Denver versus games hosted by at low altitudes in Los Angeles, Oakland, and Kansas City. Methods Information was recorded for all regular season AFC West division games (N= 42) occurring in the 2012–2018 seasons. Altitude for each stadium was calculated using DaftLogic’s Google Sandbox. Concu

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Luo, Chaoxin, Xin Xu, Changrong Du, and Qijun Zhi. "A Study on the Evolution of Emission Altitude with Frequency Among 104 Normal Pulsars." Universe 11, no. 1 (2025): 17. https://doi.org/10.3390/universe11010017.

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Utilizing the databases from the European Pulsar Network (EPN), the Australia Telescope National Facility (ATNF), and published literature data, a geometric method was used to investigate the multifrequency emission altitude of 104 pulsars. We found that the evolution of emission altitudes with frequency for the majority of pulsars can be fitted using a power-law function with a normalization constant. In this work, it is found that the frequency evolution of pulsar emission altitude can be divided into three groups according to their different frequency dependencies of emission altitude (emis

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Tang, Weizhen, Jie Dai, and Zhousheng Huang. "Comprehensive assessment of air pollutant and noise emissions at airports across different altitudes." Metascience in Aerospace 1, no. 3 (2024): 292–308. http://dx.doi.org/10.3934/mina.2024013.

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<p>We utilized the International Civil Aviation Organization (ICAO) standard emission model, refined with adjustments for fuel flow, LTO cycle work mode time, and emission indices, to investigate the environmental footprint of airports at different altitudes. Airports categorized as high (above 5000 $ \mathrm{f}\mathrm{t} $), medium (1500–5000 $ \mathrm{f}\mathrm{t} $), and low (below 1500 $ \mathrm{f}\mathrm{t} $) altitudes were selected to provide a comprehensive representation of the altitude spectrum. The analysis was anchored over the period spanning 2016 to 2017. Emission inventori

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Li, Jingyi, Nating Huang, Xun Zhang, Ci Sun, Jiarui Chen, and Qing Wei. "Changes of collagen content in lung tissues of plateau yak and its mechanism of adaptation to hypoxia." PeerJ 12 (October 1, 2024): e18250. http://dx.doi.org/10.7717/peerj.18250.

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Collagen is crucial for tissue structure, functional maintenance, and cellular processes such as proliferation and differentiation. However, the specific changes in collagen expression and its associated genes in the lung tissues of yaks at high altitudes and their relationship with environmental adaptation remain poorly understood. Studying differences in the content of collagen fibers and gene expression between yaks at high (4,500 m) and low (2,600 m) altitudes, as well as between cattle at low altitudes (2,600 m). Using Masson staining, we found that the collagen fiber content in the lung

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Shangpliang, P. Wankitlang, Rupa Nylla K. Hooroo, Graham Bakynson Ranee, Sudhanya Ray Hajong, Annu Kumari, and Eugene Lyngkhoi. "Exploring Altitude's Influence: Contrasting Embryonic Development of Hyla annectans Jerdon in High and Low Altitude Environments." UTTAR PRADESH JOURNAL OF ZOOLOGY 45, no. 7 (2024): 1–9. http://dx.doi.org/10.56557/upjoz/2024/v45i73967.

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The study investigated the embryonic development of Hyla annectans Jerdon, a frog species, at high and low altitude breeding sites of Meghalaya, North East India. Results revealed significant differences in the duration of embryonic development and hatching between the two altitudes. Embryos at low altitude sites exhibited a faster development, hatching approximately four days earlier than those at high altitude sites. Early embryonic stages displayed similar characteristics in size between the two sites, but distinct differences emerged during later stages, notably in stages associated with h

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Lu, Mengnan, Xiaona Wang, Shengnan Zhang, Shiyan Wang, and Ji De. "Seed, Germination, and Seed-Reserve Traits of Ephedra saxatilis Differ Along Different Altitudinal Gradients in Tibet, China." Journal of Biobased Materials and Bioenergy 17, no. 5 (2023): 582–90. http://dx.doi.org/10.1166/jbmb.2023.2310.

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Ephedra saxatilis, an important medicinal plant species belonging to the genus Ephedra, grows at a wide range of altitudes in Tibet, China. Collect seeds with different altitude gradients at low altitude (3500–4000 m), medium altitude (4000–4500 m), and high altitude (4500–5000 m), and study the effects of different altitude gradients on seed morphological traits, germination parameters, Seedling morphology, the morphological changes in the process of seed germination and uncracked seeds, 11 biochemical variables related to seed storage. Use correlation analysis to test the relationship betwee

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Gündeşli, Muhammet Ali, Remzi Uğur, and Mehmet Yaman. "The Effects of Altitude on Fruit Characteristics, Nutrient Chemicals, and Biochemical Properties of Walnut Fruits (Juglans regia L.)." Horticulturae 9, no. 10 (2023): 1086. http://dx.doi.org/10.3390/horticulturae9101086.

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This study aimed to investigate changes in fruit characteristics, total phenolics, total antioxidant capacity, organic acids, sugar content, and fatty acid composition in ten walnut genotypes and three cultivars grown at different altitudes under Mediterranean climate conditions. At altitudes of 500 m and 1200 m, total phenolics ranged between 237.51 and 412.96 mg GAE/100 g dw and 234.94 and 392.31 mg GAE/100 g dw, respectively. According to DPPH radical inhibition, the total antioxidant capacity varied between 47.65% and 64.99% at an altitude of 500 m and between 57.76% and 68.92% at an altit

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Lei, Tian, Jinliang Xu, Xingli Jia, Leyu Wei, and Lin Tian. "Impact of High-Altitude on Truck’s Climbing Speed: Case study in Qinghai-Tibet Plateau Area in China." Journal of Advanced Transportation 2019 (August 20, 2019): 1–14. http://dx.doi.org/10.1155/2019/8560204.

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Truck’s climbing performance is an important consideration in traffic safety, efficiency, and highway geometric design. With the infrastructure development in high-altitude area in China, more attention needs to be paid on truck’s climbing performance in such area. In this article, truck’s climbing speed in high-altitude area was examined through field tests on different grade sections at different altitudes. Truck’s speed-distance curves were built at different altitudes and the impact of altitude on truck’s climbing speed was explored based on the test results. It was shown that, within the

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Lennertz, Tracy, Andrea L. Sparko, Kim Cardosi, et al. "Pilots’ Estimation of Altitude of a Small Unmanned Aircraft System (sUAS)." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 62, no. 1 (2018): 49–53. http://dx.doi.org/10.1177/1541931218621011.

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Small unmanned aircraft system (sUAS) operations are growing at a rapid rate, with an increasing number of civilian operations. Currently, the Federal Aviation Administration permits both hobbyist and commercial operations. The requirements for the operations differ; for commercial operations, the sUAS must generally be flown under 400 feet. Past data indicate that operators are poor at judging the altitude of sUAS, and there is variability in the altitude information that is presented to the operator. Here, we examined the ability of commercial and hobbyist sUAS pilots to estimate the altitud

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Wei, Teng, Shengyue Zhong, Bin Huang, Kang Zha, Jing Li, and Qiang Wen. "Influence of Environmental Conditions Associated with Low and High Altitudes on Economic and Quality Characteristics of Fruit Ripening of Camellia chekiangoleosa Hu." Foods 14, no. 13 (2025): 2266. https://doi.org/10.3390/foods14132266.

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Camellia chekiangoleosa Hu. (C. chekiangoleosa) is a typical high-altitude oil-tea Camellia species. Due to altitude being an important factor affecting crop growth and quality, the influence of environmental conditions associated with low (60 m) and high (600 m) altitudes on the economic and quality characteristics of fruit ripening was assessed in this study. Our investigations showed that altitude has no influence on the growth pattern of C. chekiangoleosa fruit shells and seed oils, and the differences in samples between different altitudes gradually decreased with the ripening of C. cheki

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., Vibhuti, Kiran Bargali, and Surendra Bargali. "Changing pattern of plant species utilization in relation to altitude and their relative prevalence in homegardens of Kumaun Himalaya, India." Natural Resources for Human Health 2, no. 2 (2022): 253–64. http://dx.doi.org/10.53365/nrfhh/144792.

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The aim of the present study was to analyse the species utilization pattern and their relative prevalence in homegardens varying in size and altitude. Four sites were selected along an altitudinal gradient viz., very low (up to 350 m), low (350-700 m), mid (700-1500 m) and high altitudes (above 2000 m) in Kumaun Himalaya, India. At each altitude, homegardens were categorized into three size classes viz., large (above 0.007 ha), medium (0.004-0.006 ha) and small homegardens (up to 0.003 ha). Maximum species richness was recorded in large sized homegarden at all altitudes except mid altitude whe

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Blonc, S., N. Fellmann, M. Bedu, et al. "Effect of altitude and socioeconomic status on VO2max and anaerobic power in prepubertal Bolivian girls." Journal of Applied Physiology 80, no. 6 (1996): 2002–8. http://dx.doi.org/10.1152/jappl.1996.80.6.2002.

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The aim of this work was to evaluate the effects of high altitude and low socioeconomic status (SES) on aerobic and anaerobic power in 11-yr-old Bolivian girls. At both high (3,600 m) and low (420 m) altitudes, low-SES groups of girls were compared to similarly aged, high-SES girls. At low altitude, low-SES girls were also compared with younger high-SES girls with the same anthropometric characteristics. Anthropometric data were similar between high-SES and low-SES girls at both altitudes, but low-SES girls showed a 9-mo growth delay. Maximal O2 uptake was significantly lower for low-SES girls

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Snyder, L. R. "Low P50 in deer mice native to high altitude." Journal of Applied Physiology 58, no. 1 (1985): 193–99. http://dx.doi.org/10.1152/jappl.1985.58.1.193.

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Whereas it is widely believed that animals native to high altitude show lower O2 partial pressures at 50% hemoglobin saturation (P50) than do related animals native to low altitude, that “fact” has not been well documented. Consequently, P50 at pH 7.4, PCO2(7.4), the CO2 Bohr effect, and the buffer slope (delta log PCO2/delta pH) were determined via the mixing technique in Peromyscus maniculatus native to a range of altitudes but acclimated to 340 or 3,800 m. PCO2(7.4) and buffer slope were substantially lower at high altitude. The change in P50(7.4) between acclimation altitudes was minimal (

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Li, Zijun, Junjian Wang, Shuqi Zhao, and Yu Xu. "The effect of oxygen supply and oxygen distribution on single-head tunnel with different altitudes under mixed ventilation." Indoor and Built Environment 31, no. 4 (2022): 972–87. http://dx.doi.org/10.1177/1420326x211051414.

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Hypoxia plays a major role in limiting the construction of the high-altitude mine. Understanding the effect and the distribution of diffused oxygen supply at different altitudes is the premise for the design of a mine with oxygen supply system and the full utilization of oxygen resources. For the optimal design of an oxygen supply mode and ventilation system, a multi-component fluid model of the diffused oxygen supply of a single-head tunnel was developed. This study reveals the variation law of the average oxygen mass fraction at different altitudes. The relationship between the distance from

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Stickford, Abigail S. L., Daniel P. Wilhite, and Robert F. Chapman. "No Change in Running Mechanics With Live High—Train Low Altitude Training in Elite Distance Runners." International Journal of Sports Physiology and Performance 12, no. 1 (2017): 133–36. http://dx.doi.org/10.1123/ijspp.2016-0056.

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Investigations into ventilatory, metabolic, and hematological changes with altitude training have been completed; however, there is a lack of research exploring potential gait-kinematic changes after altitude training, despite a common complaint of athletes being a lack of leg "turnover" on return from altitude training.Purpose:To determine if select kinematic variables changed in a group of elite distance runners after 4 wk of altitude training.Methods:Six elite male distance runners completed a 28-d altitude-training intervention in Flagstaff, AZ (2150 m), following a modified “live high–tra

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Ren, Xirong, Minyao Lin, Jiani Liu, et al. "Effects of Altitude on Tea Composition: Dual Regulation by Soil Physicochemical Properties and Microbial Communities." Plants 14, no. 11 (2025): 1642. https://doi.org/10.3390/plants14111642.

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Soil chemical properties and soil microbial communities are the key factors affecting the content of tea. The mechanism by which altitude changes soil’s chemical properties and microbial community structure to affect tea content is unclear. This study was conducted on a typical tea plantation in the Fenghuang Mountains of Chaozhou, China. It systematically revealed the relationship between soil chemical properties and microbial communities with tea quality components between different altitudes (396 m/517 m/623 m). We discovered that soil pH and soil Catalase activity appeared to decrease and

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Eskandar, Mamdoh, Wardah Alasmari, Fawaz Idris, et al. "Impact of Living in Different Altitudes on Intracytoplasmic Sperm Injection (ICSI) Outcomes for Infertile Couples in Southwestern Region of Saudi Arabia, a Retrospective Study." Obstetrics Gynecology and Reproductive Sciences 6, no. 1 (2022): 01–07. http://dx.doi.org/10.31579/2578-8965/104.

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Objective: The aim of this study was to determine the effect of different altitudes in the Southwestern region of Saudi Arabia on ICSI outcomes, fertilization rate, embryo quality, pregnancy rate, and miscarriage rates for infertile couples. Materials and Methods: This is a retrospective study on 551 infertile couples carried out in the Assisted Reproductive Technology unit at the Maternity and Childern Hospital in Abha, Saudi Arabia between 2018 and 2019 to compare ICSI outcomes in different altitudes. Low altitude (205 patients), mild altitude (86 patients) and high altitude (260 patients).

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Chapman, Robert F., Trine Karlsen, R. L. Ge, James Stray-Gundersen, and Benjamin D. Levine. "Living altitude influences endurance exercise performance change over time at altitude." Journal of Applied Physiology 120, no. 10 (2016): 1151–58. http://dx.doi.org/10.1152/japplphysiol.00909.2015.

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For sea level based endurance athletes who compete at low and moderate altitudes, adequate time for acclimatization to altitude can mitigate performance declines. We asked whether it is better for the acclimatizing athlete to live at the specific altitude of competition or at a higher altitude, perhaps for an increased rate of physiological adaptation. After 4 wk of supervised sea level training and testing, 48 collegiate distance runners (32 men, 16 women) were randomly assigned to one of four living altitudes (1,780, 2,085, 2,454, or 2,800 m) where they resided for 4 wk. Daily training for a

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Weinstein, Y., M. H. Bernstein, P. E. Bickler, D. V. Gonzales, F. C. Samaniego, and M. A. Escobedo. "Blood respiratory properties in pigeons at high altitudes: effects of acclimation." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 249, no. 6 (1985): R765—R775. http://dx.doi.org/10.1152/ajpregu.1985.249.6.r765.

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Many birds thrive at high altitudes where environmental temperatures are low. Previous studies have shown that tolerance of and acclimation to hypoxia involve cardiopulmonary and hematological adaptations. We investigated blood respiratory properties during exposure to simulated high altitude (hypobaric hypoxia) and low temperature in unanesthetized resting pigeons (Columbia livia, mean mass 0.38 kg). A control group (C) and a group acclimated to 7 km above sea level (ASL) in a hypobaric chamber at 25 degrees C (HA group) were used. All were acutely exposed to altitudes through 9 km ASL at 5 o

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S., Patgiri,, Rajani, C. V., Surjith, K. P., Patki, H. S., Leena, C., and Indu V. R. "Histology of the Thyroid Gland in Large White Yorkshire Pigs Reared at Low and High Altitudes of Kerala, India." UTTAR PRADESH JOURNAL OF ZOOLOGY 46, no. 12 (2025): 351–60. https://doi.org/10.56557/upjoz/2025/v46i125072.

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The histological and ultrastructural studies were carried out on thyroid samples (n = 24) collected from ten–month-old Large White Yorkshire pigs of either sex reared in low altitude and high altitude of Kerala. Histologically, the gland enclosed spherical or oval thyroid follicles of various sizes. Small-sized follicles were predominantly in the peripheral zone of the gland. The staining intensity of the colloid within the follicles varied from acidophilic to basophilic. A single layer of low cuboidal cells lined the follicles. Predominance of basophilic colloid, vacuoles at the periphery of

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Al-Mosa, Amal, Eid I. Brima, Khaled F. Fawy, Hamed A. AL Ghrama, and Mohammed E. A. Mohammed. "Antioxidant Vitamins in Honey Samples from Different Floral Origins and Altitudes in Asir Region at the South-Western Part of Saudi Arabia." Current Nutrition & Food Science 15, no. 3 (2019): 296–304. http://dx.doi.org/10.2174/1573401314666180606085841.

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Background: Different factors are known to affect the different physiochemical properties of bee's honey including the floral origin and climate. Objective: The aim of this article was to investigate the effect of floral origin and altitude on the concentration of vitamin C and A. Methods: Ten Ziziphus honey samples were collected from two altitudes; 113 and 511 meters. Twenty-five Acacia honey samples were included in this study from five altitudes; 14, 113, 317, 576 and 2247 meters above sea level. Vitamin C was measured by redox titration and vitamin A was estimated using the Carr-price rea

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PUTRA, HIRMAS FUADY, DHENOK SEKAR AMBARWATI, NURRIZKI MUBYRASIH, and TERSI ALESTI. "Karakteristik Fisiologis Lumut pada Beberapa Ketinggian di Kawasan Gunung Tangkuban Perahu." Jurnal Sumberdaya Hayati 1, no. 2 (2016): 60–63. http://dx.doi.org/10.29244/jsdh.1.2.60-63.

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Environmental factors greatly influence the physiological state of moss. Some of the environmental factors that influence the physiological of moss are air temperature, humidity, and light intensity. These three environmental factors will vary at each altitude. This study aims to determine the physiological characteristics of mosses on some altitudes in the area of Mount Tangkuban Perahu (Ratu Crater – Domas Crater track). The method that are used is to measure air temperature, humidity, and light intensity at some altitudes. Subsequently, samples were taken at each altitude, to measured chlor

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Wang, Yunteng, Hairong Zou, Honggang Xiang, and Zuoyong Gong. "Research on temperature rise performance of DC universal disconnect switch at high altitude." Journal of Physics: Conference Series 2873, no. 1 (2024): 012020. http://dx.doi.org/10.1088/1742-6596/2873/1/012020.

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Abstract Low Voltage appliances are used more and more widely in high altitude areas, but the research on their temperature rise performance is still insufficient. Aiming at this problem, a high altitude temperature rise simulation model is established and verified by experiment, and the temperature rise performance is studied. Firstly, a DC universal isolation switch with a rated current of 1600A was used as the carrier to build an electro-thermal coupling calculation model of high-altitude temperature rise. Secondly, the temperature rise experiment of the isolation switch in high altitude en

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Susanto, Maghfirah, and Muhammad Hasan. "Clinical Aspects of Highland Sickness and Climbing." Sriwijaya Journal of Forensic and Medicolegal 1, no. 2 (2023): 43–45. http://dx.doi.org/10.59345/sjfm.v1i2.64.

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Altitude sickness occurs when hypoxic stress is greater than the individual's ability to adapt. Risk factors for high altitude sickness include increased physical activity with inadequate acclimatization, inadequate education and preparation, individual susceptibility, and previous high altitude sickness. This review aims to describe the clinical aspects of high-altitude disease. There is a spectrum of neurological conditions caused by altitude, ranging from acute mountain sickness (AMS) to more serious forms, such as high-altitude cerebral edema (HACE). HACE includes symptoms of severe AMS an

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Wang, Yi, Hongchu Wang, Yinru Chen, Naxin Xu, Winson Lee, and Wing-Kai Lam. "Pulmonary Capacity, Blood Composition and Metabolism among Coal Mine Workers in High- and Low-Altitude Aboveground and Underground Workplaces." International Journal of Environmental Research and Public Health 19, no. 14 (2022): 8295. http://dx.doi.org/10.3390/ijerph19148295.

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(1) Background: While previous studies revealed how underground mining might adversely affect the cardiopulmonary functions of workers, this study further investigated the differences between under- and aboveground mining at both high and low altitudes, which has received little attention in the literature. (2) Methods: Seventy-one healthy male coal mine workers were recruited, who had worked at least 5 years at the mining sites located above the ground at high (>3900 m; n = 19) and low (<120 m; n = 16) altitudes as well as under the ground at high (n = 20) and low (n = 16) altitudes. Pa

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Mishra, Rajesh Chandra, Gaurav Mishra, Ahsina Jahan, and Saurabh Debnath. "High Altitude De-Acclimatization Syndrome (HADAS): A case report." Journal of Nepalese Society of Critical Care Medicine 2, no. 3 (2024): 20–22. http://dx.doi.org/10.3126/jnsccm.v2i3.71541.

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High Altitude De-acclimatization Syndrome (HADAS) is a clinical entity that arises when individuals return abruptly from high-altitude environments to lower altitudes without undergoing the necessary acclimatization processes. While altitude-related illnesses have been extensively studied, HADAS remains relatively underreported and may pose diagnostic challenges due to its varied and nonspecific clinical presentation. This case report aims to shed light on the importance of recognizing HADAS as a potential consequence of inadequate acclimatization, emphasizing the need for a thorough understan

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Abas, Azlan, and Laily Din. "The Diversity of Lichens along Elevational Gradients in the Tropical Montane Forest of Selangor, Malaysia." Sains Malaysiana 50, no. 5 (2021): 1199–209. http://dx.doi.org/10.17576/jsm-2021-5005-01.

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This study aims to explore how lichen diversity, composition, and distribution vary with altitude, and environmental factors (temperature and relative humidity). The study was conducted in the forest of Gunung Bunga Buah, Selangor at five sites (different altitudes). Forty-four lichen species were identified. Their diversity, composition, and distribution correlated significantly with the altitude and environmental factors, increasing diversity at higher altitudes. Graphidaceae and Physciaceae species were present at all altitudes, and the dominant species changed according to altitude: Some P

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Yao, Xiuyuan, Yu Su, Songsong Zhou, et al. "Gap distance of UHV substation in areas with an altitude of 5000 m and below." Journal of Physics: Conference Series 2797, no. 1 (2024): 012015. http://dx.doi.org/10.1088/1742-6596/2797/1/012015.

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Abstract In view of the increasing energy consumption and power demand, the construction of UHV AC is growing rapidly, and the construction of the project is gradually advancing to higher altitudes. It is urgent to conduct research on typical gap discharge in substations at high altitudes. Combined with the engineering requirements, this paper corrects the test data at an altitude of 0 m according to GB/T 24842 standard through altitude correction and combines the discharge voltage requirements of various typical gaps in substations to obtain the minimum air gap distance in UHV substations at

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Ortiz-Prado, Esteban, Juan S. Izquierdo-Condoy, Raúl Fernández-Naranjo, et al. "Epidemiological characterization of ischemic heart disease at different altitudes: A nationwide population-based analysis from 2011 to 2021 in Ecuador." PLOS ONE 18, no. 12 (2023): e0295586. http://dx.doi.org/10.1371/journal.pone.0295586.

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Background Cardiovascular diseases, including ischemic heart disease, are the leading cause of premature death and disability worldwide. While traditional risk factors such as smoking, obesity, and diabetes have been thoroughly investigated, non-traditional risk factors like high-altitude exposure remain underexplored. This study aims to examine the incidence and mortality rates of ischemic heart disease over the past decade in Ecuador, a country with a diverse altitude profile spanning from 0 to 4,300 meters. Methods We conducted a geographic distribution analysis of ischemic heart disease in

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Lima, Paula Aparecida Muniz de, José Henrique Soler Guilhen, Khétrin Silva Maciel, Rodrigo Sobreira Alexandre, Adésio Ferreira, and José Carlos Lopes. "Physiological quality of ‘BRS’ passion fruit seeds grown at different altitudes and storage environments." Comunicata Scientiae 14 (September 30, 2023): e3993. http://dx.doi.org/10.14295/cs.v14.3993.

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The aim of this work was to study the physiological quality of ‘BRS’ passion fruit seeds grown at different altitudes stored in cold chamber and in natural environment for six months. Hybrid passion fruit seeds (BRS Gigante Amarelo, BRS Sol do Cerrado and BRS Rubi do Cerrado) grown at three altitudes (104; 711; 1016 meters) in the southern region of the state of Espírito Santo were used. Germination was carried out in germitest paper rolls, placed in BOD-type germination chambers at temperature of 20-30 ºC. The following parameters were analyzed: germination, germination speed index, shoot and

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Liang, Tao, Weilin Tao, Yan Wang, et al. "The Extension of Vegetable Production to High Altitudes Increases the Environmental Cost and Decreases Economic Benefits in Subtropical Regions." Land 12, no. 3 (2023): 662. http://dx.doi.org/10.3390/land12030662.

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Global warming has driven the expansion of cultivated land to high-altitude areas. Intensive vegetable production, which is generally considered to be a high economic value and high environmental risk system, has expanded greatly in high-altitude mountainous areas of China. However, the environmental cost of vegetable production in these areas is poorly understood. In this study, pepper production at low (traditional pepper production area) and high (newly expanded area) altitudes were investigated in Shizhu, a typical pepper crop area. The output and environmental cost at the two altitudes we

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Stothard, Ellen, Mark Hickey, and Christine Ebert-Santos. "0164 Overnight Oximetry in Generationally Un-Adapted Residents of High-Altitude." Sleep 45, Supplement_1 (2022): A76. http://dx.doi.org/10.1093/sleep/zsac079.162.

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Abstract Introduction A recent population shift has increased residents of high-altitude locations. Additionally, travel infrastructure has created the opportunity for rapid displacement to high altitudes without adaptation. Residing at high-altitude is a physiological challenge, which increases the risk of overnight hypoxia from sleep disordered breathing. Sleep disordered breathing, including sleep apnea, is a risk factor for a variety of additional negative health outcomes. Additional information is needed to understand the physiology of high-altitude adaptation in generationally un-adapted

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Shrestha, Sabina, Aparajita Manoranjan, and Sushan Man Shrestha. "Oxygen saturation at different altitudes in Nepal among adults." Grande Medical Journal 2, no. 1 (2020): 19–21. http://dx.doi.org/10.3126/gmj.v2i1.45674.

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Introduction: The partial pressure of oxygen in the atmosphere decreases proportionately with an increase in the altitude. The study was done to compare the oxygen saturation of non-acclimatized adults going to different altitudes in Nepal. Materials and Methods: It was a descriptive observational study conducted on ten individuals of a medical team traveling to Humla district of Nepal for a multi-disciplinary medical camp. Oxygen saturation was measured at different altitudes i.e. in Kathmandu, Nepalgunj, in the flight at an altitude of 3360 meters and in Bargaun village of Humla district loc

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Ginoga, Lin Nuriah, Siti Badriyah Rushayati, and Inu Fauzan Hawari. "The effect of altitude on the butterfly diversity in the Gunung Gede Pangrango National Park, West Java, Indonesia." Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) 14, no. 2 (2024): 210. http://dx.doi.org/10.29244/jpsl.14.2.210.

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Altitude is one of the factors that decrease butterfly diversity due to the different types of habitats. Gunung Gede Pangrango National Park is one of the places at different altitudes, such as Situgunung Resort. This study aimed to investigate butterfly species' diversity, richness, and evenness at three altitude levels. This study was completed in October 2019 at altitudes 750, 850, and 950 meters above sea level (masl). Butterfly inventory (diversity) data were collected using the transect method, and data on habitat characteristics were acquired through direct observation. The richness, di

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Suchý, Jiří, Jiří Novotný, and Pavel Tilinger. "Porovnání vlivu hyperoxie na krátkodobý anaerobní výkon v nížině a vyšší nadmořské výšce." Studia sportiva 4, no. 1 (2010): 17–23. http://dx.doi.org/10.5817/sts2010-1-3.

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The article compares the infl uence of inhaling concentrated oxygen on short-term repeated performance in lowlands and at high altitudes above sea level (1 835 m a.s.l.). Th e source of concentrated oxygen was Oxyfi t. Th e subjects (n=10) completed a total of four tests comprised of two Wingate tests at a 10 minute interval. Two tests were carried out at a low altitude and two at a higher altitude above sea level. During the recovery period between tests the monitored subjects inhaled Oxyfi t or a placebo (at both the low and high altitudes). Th e study showed signifi cantly (p < 0.05) hig

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Chi Lin, Bo Zhang, Xiaolong Zhao, et al. "Hyperuricemia as a risk factor for cerebral hemorrhage in young and middle-aged hypertensive patients at high altitude." Neurology Asia 29, no. 2 (2024): 293–300. http://dx.doi.org/10.54029/2024jyx.

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Background: The purpose of this research was to investigate the effect of uric acid on hypertensive intracerebral hemorrhage (HICH) in young and middle-aged hypertensive patients at high altitude. Methods: High-altitude and low-altitude HICH patients were analyzed retrospectively, and the influence of uric acid on hemorrhage was analyzed by the correlations between age and uric acid, between age and hemoglobin, and between uric acid and hemoglobin. The individuals in the high- and low-altitude groups were assigned to a young/middle-aged group and an elderly group, and the correlation between a

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Ghelichnia, H. "Essential Oil Composition of Thymus fedtschenkoi Ronniger at Different Growing Altitudes in Mazandaran, Iran." Cercetari Agronomice in Moldova 51, no. 2 (2018): 75–83. http://dx.doi.org/10.2478/cerce-2018-0018.

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Abstract Thymus fedtschenkoi Ronniger (Lamiaceae) is a permanent, that grows in some mountain rangelands of Iran, including Mazandaran province. The aerial parts of Thymus fedtschenkoi were collected during flowering stage in June 2012, from mountain rangelands of Mazandaran province, in north of Iran. Samples were collected from five altitudes (1300 m, 1600 m, 2000 m, 2400 m and 3000 m) in mountain region of Mazandaran province. The goal of current research was to assessment the effect of altitude on the chemical composition and function of essential oil in Thymus fedtschenkoi. The essential

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Subedi, Dharma Datta, Muza Shrestha, Biyush Pokharel, Prabodh Regmi, and Jay Narayan Shah. "Endoscopic findings of acid peptic disease at low and high altitude: Kathmandu versus Rasuwa districts of Nepal." Journal of Patan Academy of Health Sciences 9, no. 2 (2022): 49–54. http://dx.doi.org/10.3126/jpahs.v9i2.48082.

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Introduction: Features of Acid Peptic Disease (APD) have specific presentations from low to high altitudes. This study aims to compare the endoscopy findings of APD at low altitudes (Kathmandu Valley) and High Altitudes (Rasuwa District) of Nepal. Method: Endoscopy findings of APD patients from Nov 2017 to Dec 2021 at Manmohan Medical College and Teaching Hospital (MMTH) were reviewed from the data kept in the endoscopy unit to compare the findings in patients from low altitudes (Kathmandu valley) and high altitudes (Rasuwa district). Variables included were age, sex, and endoscopy findi

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Salvi, Paolo, Andrea Grillo, Fausto Brunacci, et al. "Microcirculatory and Rheological Adaptive Mechanisms at High Altitude in European Lowlander Hikers and Nepalese Highlanders." Journal of Clinical Medicine 12, no. 8 (2023): 2872. http://dx.doi.org/10.3390/jcm12082872.

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Background: Physical activity at high-altitudes is increasingly widespread, both for tourist trekking and for the growing tendency to carry out sports and training activities at high-altitudes. Acute exposure to this hypobaric–hypoxic condition induces several complex adaptive mechanisms involving the cardiovascular, respiratory and endocrine systems. A lack of these adaptive mechanisms in microcirculation may cause the onset of symptoms of acute mountain sickness, a frequent disturbance after acute exposure at high altitudes. The aim of our study was to evaluate the microcirculatory adaptive

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Khan, Inam Danish. "Knowledge, Attitude and Practices Regarding Extreme Environments and Cold Adaptation at Extreme Altitudes on the Himalayan Ranges." International Journal of Travel Medicine and Global Health 8, no. 1 (2020): 18–21. http://dx.doi.org/10.34172/ijtmgh.2020.03.

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Introduction: Extreme-altitudes (5500 m/18045 ft and higher) pose environmental, psychophysiological, infrastructural, logistic, and ergonomic challenges that question explorer’s adaptability and mission-efficiency due to isolation, monotony, intimidating environment and terse health conditions. The assessment of an explorer’s comprehensive adaptability in extreme-altitudes is of paramount importance in ensuring mission-preparedness. Knowledge, attitude, and practices (KAP) of explorers staying on extreme-altitudes was assessed through personal interview technique. Methods: 125 healthy, acclim

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ACARSOY BİLGİN, Nihal, and Adalet MISIRLI. "The effect of different altitudeson nut properties and yield in “Chandler” walnut variety." Ege Üniversitesi Ziraat Fakültesi Dergisi 60, no. 4 (2023): 639–46. http://dx.doi.org/10.20289/zfdergi.1266186.

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Objective: It was aimed to evaluate and interpret nut parameters of “Chandler”walnut variety at two different altitudes according to years. Material and Methods: Thisresearch was conducted in a commercial orchard located at an altitude of 50 and 750 m in Manisa province during 2017 and 2021 years. “Chandler” walnut variety was used as plant material. Results: Accordingly, the highest nut weight was determined as 13.89 g at 50 m altitude in 2018. The highest nut width, length, and height values were detected in the same year and altitude. For altitudes of 50 m and 750 m, the shell t

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Wang, Yuchen, Anqi Guo, Xinli Yu, et al. "New insights into changes in ocular structural parameters in simulated hypobaric hypoxia." BMJ Open Ophthalmology 10, no. 1 (2025): e001928. https://doi.org/10.1136/bmjophth-2024-001928.

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PurposeHigh altitude is the main area for human exploration, and human eye is an important organ for obtaining visual signals. The changes of ocular structural parameters in a simulated hypobaric hypoxia environment need to be clarified.MethodsMeasurements were taken at five altitudes ((1) ground, (2) 3500 m, (3) 4000 m, (4) 4500 m and (5) ground). Refractive values were measured with the IOL Master (Carl Zeiss Shanghai Co. Ltd.). Data analysis was performed using the Kolmogorov-Smirnov (K-S) test, paired sample T-test and Wilcoxon test.ResultsSubjects’ axial length (AL) increased with altitud

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Nussbaumer-Ochsner, Y., and K. E. Bloch. "Lessons from high-altitude physiology." Breathe 4, no. 2 (2007): 122–32. https://doi.org/10.1183/18106838/breathe.4.2.122.

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Educational aimsTo review the physiological response to high-altitude exposure.To discuss the three major high-altitude diseases: acute mountain sickness, high-altitude cerebral oedema and high-altitude pulmonary oedema.To provide information on prevention and treatment of high-altitude diseases.SummaryHigh-altitude exposure causes a series of normal physiological responses, termed acclimatisation, which mitigate the effects of hypobaric hypoxia. Hypoxic ventilatory stimulation results in improved oxygen uptake but is associated with respiratory alkalosis that may trigger periodic breathing, p

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Jiao, Jun, Bifeng Song, Yubin Li, Yugang Zhang, and Jianhua Xu. "Development of a testing methodology for high-altitude propeller." Aircraft Engineering and Aerospace Technology 90, no. 9 (2018): 1486–94. http://dx.doi.org/10.1108/aeat-02-2017-0069.

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Purpose The purpose of this paper is to develop a propeller performance measurement method for high-altitude platforms by analyzing of the propeller aerodynamic characteristics and application of a mobile testing system. Design/methodology/approach An experimental approach is adopted for this study. Considering the aerodynamic characteristics of the high-altitude propeller, the similitude of the scaled propeller model in the experiment is analyzed and determined. Then, the experimental method and procedure to obtain the propeller’s performance under different altitudes are presented, and the s

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