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The system was calibrated for the respective altitude. Measurements were performed at Kathmandu (1400\u00a0m) and at Gorak Shep (5300\u00a0m) (Solo Khumbu\/Nepal) after 10\u00a0days of acclimatization while on trek. Temporary threshold shift (TTS) was analyzed by descriptive statistics and by factor analysis.<\/jats:p>\n            <\/jats:sec><jats:sec>\n              <jats:title>Results<\/jats:title>\n              <jats:p>TTS is significantly more pronounced at high altitudes. Acclimatization does not provide any protection of the inner ear, although it increases arterial oxygen saturation.\n<\/jats:p>\n            <\/jats:sec><jats:sec>\n              <jats:title>Conclusion<\/jats:title>\n              <jats:p>The thresholds beyond which noise protection is recommended (&gt;\u200980\u00a0dB) or necessary (&gt;\u200985\u00a0dB) are not sufficient at high altitudes. We suggest providing protective devices above an altitude of 1500\u00a0m (\u201cear threshold altitude\u201d) when noise level is higher than 75\u00a0dB and using them definitively above 80\u00a0dB. This takes the individual reaction on hypobaric hypoxia at high altitude into account.\n<\/jats:p>\n            <\/jats:sec>","DOI":"10.1007\/s00420-021-01715-w","type":"journal-article","created":{"date-parts":[[2021,5,22]],"date-time":"2021-05-22T16:02:23Z","timestamp":1621699343000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["Temporary threshold shift after noise exposure in hypobaric hypoxia at high altitude: results of the ADEMED expedition 2011"],"prefix":"10.1007","author":[{"given":"K.","family":"Fehrenbacher","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Apel","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"D.","family":"Bertsch","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. 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