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Core body temperature rises to critical levels, causing hyperthermia and central nervous system dysfunction. Best practice for the prevention of EHI centres around early detection, rapid response and aggressive cooling. Advance planning enables risk mitigation measures. The more that is known about EHI in horses, the better prepared those in the positions of responsibility can be to anticipate events in which the risk of EHI may be elevated. This prospective, observational study investigated environmental risk factors associated with the occurrence of EHI. From 2014 to 2018, the number of horses exhibiting the symptoms of post\u2010race EHI was recorded at 73 convenience sampled race meetings. Of the 4809 starters, the signs of EHI were recorded for 457. Thermal environmental data were measured and included ambient temperature, radiant heat, vapor pressure (humidity) and wind speed (WS). Mixed linear regression models were computed to assess the associations between the occurrence and incidence of post\u2010race EHI and the four thermal environmental variables. The analysis showed that vapor pressure and WS had the largest effects on the occurrence of post\u2010race EHI. The major limitations were that the race meetings selected were convenience sampled according to attendance by the first author and individual horse data were not available. EHI is influenced by a complex interaction of independently acting environmental variables, but warm, windless, humid days are most likely to result in the cases of EHI.<\/jats:p>","DOI":"10.1111\/avj.13108","type":"journal-article","created":{"date-parts":[[2021,8,6]],"date-time":"2021-08-06T06:15:51Z","timestamp":1628230551000},"page":"473-481","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["An investigation into environmental variables influencing post\u2010race exertional heat illness in thoroughbred racehorses in temperate eastern Australia"],"prefix":"10.1111","volume":"99","author":[{"given":"MA","family":"Brownlow","sequence":"first","affiliation":[{"name":"Racing Australia Druitt Street Sydney New South Wales 2000 Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"JR","family":"Brotherhood","sequence":"additional","affiliation":[{"name":"Discipline of Exercise and Sports Science, School of Health Sciences, Faculty of Medicine and Health University of Sydney Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,8,5]]},"reference":[{"key":"e_1_2_9_2_1","first-page":"1","article-title":"Post race distress syndrome\u201d in thoroughbred racehorses in South Africa","volume":"17","author":"McDonald DM","year":"2008","journal-title":"Proc Int Conf Racing Anal Vet"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1111\/avj.12454"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1294\/jes.30.17"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/evj.13179"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/eve.13433"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/eve.13459"},{"key":"e_1_2_9_8_1","first-page":"17","volume-title":"Exertional heat illness","author":"Armstrong LE","year":"2003"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.1152\/jappl.1993.74.3.1161"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1242\/jeb.179.1.159"},{"key":"e_1_2_9_11_1","unstructured":"JMcNair Racehorse trainer Perth Western Australia. 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