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To evaluate classification criteria by acclimation state and sex. Forty participants (19M\/21F, mean\u2009\u00b1\u2009SD, 23\u2009\u00b1\u20094\u2009years) completed an HTT (120\u2009min, 5\u2009km\u00b7h\n                    <jats:sup>\u22121<\/jats:sup>\n                    , 2% grade) before (PreHA) and after (PostHA) 5\u2009days of repeated exercise in (40\u00b0C, 40% RH) categorized as isothermal (exercise intensity adjusted to maintain T\n                    <jats:sub>rec<\/jats:sub>\n                    within 38.5\u00b0C\u201339.5\u00b0C, 60\u2009min) exercise\u2010heat acclimation (HA). Females had lower body surface area (vs. males) (1.7\u2009\u00b1\u20090.1 vs. 2.0\u2009\u00b1\u20090.2\u2009m\n                    <jats:sup>2<\/jats:sup>\n                    ,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), mass (59.5\u2009\u00b1\u20095.4 vs. 79.5\u2009\u00b1\u200910.1\u2009kg,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), height (164.2\u2009\u00b1\u20095.7 vs. 179.1\u2009\u00b1\u20097.6\u2009cm,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), maximal oxygen consumption (V\u0307O\n                    <jats:sub>2<\/jats:sub>\n                    max, 44.5\u2009\u00b1\u20095.1 vs. 51.5\u2009\u00b1\u20095.7\u2009mL\u00b7min\n                    <jats:sup>\u22121<\/jats:sup>\n                    \u00b7kg\n                    <jats:sup>\u22121<\/jats:sup>\n                    ,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001), and velocity at V\u0307O\n                    <jats:sub>2<\/jats:sub>\n                    max (12.9\u2009\u00b1\u20091.5 vs. 15.0\u2009\u00b1\u20091.7\u2009km\u00b7h\n                    <jats:sup>\u22121<\/jats:sup>\n                    ,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001). PreHA 51.1% (mean % HI classification across criteria) of participants were HI (66.7% F\/52.6% M), decreasing (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.001) to 23.6% PostHA (28.6% F\/10.5% M), reflected across criteria (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05). The rate of HI based on plateau in T\n                    <jats:sub>rec<\/jats:sub>\n                    during the final 60\u2009min (\u0394T\n                    <jats:sub>rec (T120\u2013T60)<\/jats:sub>\n                    \u2009\u2265\u20090.45\u00b0C) was similar (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.735) PreHA (15% HI) and PostHA (10%), and HA reduced \u0394T\n                    <jats:sub>rec (T120\u2013T60)<\/jats:sub>\n                    (0.30\u2009\u00b1\u20090.19 vs. 0.19\u2009\u00b1\u20090.20\u00b0C,\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.001), demonstrating sensitivity to adaptation. HA reduces HI classification rate, but criteria differ in capturing presumed HT and classify more females as HI in na\u00efve and acclimated states.\n                  <\/jats:p>","DOI":"10.14814\/phy2.70745","type":"journal-article","created":{"date-parts":[[2026,2,16]],"date-time":"2026-02-16T11:35:02Z","timestamp":1771241702000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Heat tolerance classification criteria require population\u2010specific thresholds for accurate assessment of acclimation state in adults"],"prefix":"10.14814","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6055-8220","authenticated-orcid":false,"given":"Jacob S.","family":"Bowie","sequence":"first","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael R.","family":"Szymanski","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jeb F.","family":"Struder","sequence":"additional","affiliation":[{"name":"Biomedical Engineering, College of Engineering University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7746-8475","authenticated-orcid":false,"given":"Erica M.","family":"Filep","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Margaret C.","family":"Morrissey\u2010Basler","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gabrielle J.","family":"Brewer","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Staci N.","family":"Thornton","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kyle J.","family":"Mahoney","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yasuki","family":"Sekiguchi","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Oh Sung","family":"Kwon","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4422-4837","authenticated-orcid":false,"given":"Ki","family":"Chon","sequence":"additional","affiliation":[{"name":"Biomedical Engineering, College of Engineering University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Douglas J.","family":"Casa","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"},{"name":"Korey Stringer Institute University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4105-7620","authenticated-orcid":false,"given":"Elaine C.","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Kinesiology University of Connecticut  Storrs Connecticut USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2026,2,15]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"publisher","DOI":"10.1249\/MSS.0000000000003545"},{"key":"e_1_2_12_3_1","doi-asserted-by":"publisher","DOI":"10.3390\/medicina57020173"},{"key":"e_1_2_12_4_1","doi-asserted-by":"publisher","DOI":"10.3390\/biology10101068"},{"key":"e_1_2_12_5_1","first-page":"165","article-title":"RStudio: Integrated Development Environment for R","volume":"770","author":"Allaire J.","year":"2012","journal-title":"Boston, MA"},{"key":"e_1_2_12_6_1","doi-asserted-by":"publisher","DOI":"10.1123\/ijsn.4.3.265"},{"key":"e_1_2_12_7_1","unstructured":"Borchers H. 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