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Only a few studies describe the influence of the weather conditions in the Himalayas on the body\u2019s ability to maintain thermal balance. The aim of the present research is to trace the heat exchange between humans and their surroundings during a typical, 6-day summit attempt of Mount Everest in the spring and winter seasons. Additionally, an emergency night outdoors without tent protection is considered. Daily variation of the heat balance components were calculated by the MENEX_HA model using meteorological data collected at automatic weather stations installed during a National Geographic expedition in 2019\u20132020. The data represent the hourly values of the measured meteorological parameters. The research shows that in spite of extreme environmental conditions in the sub-summit zone of Mount Everest during the spring weather window, it is possible to keep heat equilibrium of the climbers\u2019 body. This can be achieved by the use of appropriate clothing and by regulating activity level. In winter, extreme environmental conditions in the sub-summit zone make it impossible to maintain heat equilibrium and lead to hypothermia. The emergency night in the sub-peak zone leads to gradual cooling of the body which in winter can cause severe hypothermia of the climber\u2019s body. At altitudes &lt; 7000 m, climbers should consider using clothing that allows variation of insulation and active regulation of their fit around the body.<\/jats:p>","DOI":"10.1007\/s00484-023-02594-1","type":"journal-article","created":{"date-parts":[[2023,12,19]],"date-time":"2023-12-19T21:32:45Z","timestamp":1703021565000},"page":"351-366","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Simulations of the human heat balance during Mount Everest summit attempts in spring and winter"],"prefix":"10.1007","volume":"68","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0439-6642","authenticated-orcid":false,"given":"Krzysztof","family":"B\u0142a\u017cejczyk","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"George","family":"Havenith","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert K.","family":"Szymczak","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2023,12,19]]},"reference":[{"key":"2594_CR1","doi-asserted-by":"publisher","first-page":"548","DOI":"10.1136\/bjsm.37.6.548","volume":"37","author":"PN Ainslie","year":"2003","unstructured":"Ainslie PN, Reilly T (2003) Physiology of accidental hypothermia in the mountains: a forgotten story. 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