{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,4]],"date-time":"2026-05-04T06:48:40Z","timestamp":1777877320478,"version":"3.51.4"},"reference-count":44,"publisher":"SAGE Publications","issue":"2","license":[{"start":{"date-parts":[[2024,5,6]],"date-time":"2024-05-06T00:00:00Z","timestamp":1714953600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Sports Health: A Multidisciplinary Approach"],"published-print":{"date-parts":[[2025,3]]},"abstract":"\n Background:<\/jats:title>\n \n Maximal oxygen uptake (VO\n 2max<\/jats:sub>\n ) is an important determinant of endurance performance. Heat acclimation\/acclimatization (HA\/HAz) elicits improvements in endurance performance. Upon heat exposure reduction, intermittent heat training (IHT) may alleviate HA\/HAz adaptation decay; however, corresponding VO\n 2max<\/jats:sub>\n responses are unknown.\n <\/jats:p>\n <\/jats:sec>\n \n Hypothesis:<\/jats:title>\n \n VO\n 2max<\/jats:sub>\n is maintained after HAz\/HA; IHT mitigates decrements in aerobic power after HAz\/HA.\n <\/jats:p>\n <\/jats:sec>\n \n Study Design:<\/jats:title>\n Interventional study.<\/jats:p>\n <\/jats:sec>\n \n Level of Evidence:<\/jats:title>\n Level 3.<\/jats:p>\n <\/jats:sec>\n \n Methods:<\/jats:title>\n \n A total of 27 male endurance runners (mean \u00b1 SD; age, 36 \u00b1 12 years; body mass, 73.03 \u00b1 8.97 kg; height, 178.81 \u00b1 6.39 cm) completed VO\n 2max<\/jats:sub>\n testing at 5 timepoints; baseline, post-HAz, post-HA, and weeks 4 and 8 of IHT (IHT\n 4<\/jats:sub>\n , IHT\n 8<\/jats:sub>\n ). After baseline testing, participants completed HAz, preceded by 5 days of HA involving exercise to induce hyperthermia for 60 minutes in the heat (ambient temperature, 39.13 \u00b1 1.37\u00b0C; relative humidity, 51.08 \u00b1 8.42%). Participants were assigned randomly to 1 of 3 IHT groups: once-weekly, twice-weekly, or no IHT. Differences in VO\n 2max<\/jats:sub>\n , velocity at VO\n 2max<\/jats:sub>\n (vVO\n 2<\/jats:sub>\n ), and maximal heart rate (HR\n max<\/jats:sub>\n ) at all 5 timepoints were analyzed using repeated-measure analyses of variance with Bonferroni corrections post hoc.\n <\/jats:p>\n <\/jats:sec>\n \n Results:<\/jats:title>\n \n No significant VO\n 2max<\/jats:sub>\n or vVO\n 2<\/jats:sub>\n differences were observed between baseline, post-HAz, or post-HA (\n P<\/jats:italic>\n = 0.36 and\n P<\/jats:italic>\n = 0.09, respectively). No significant group or time effects were identified for VO\n 2max<\/jats:sub>\n or vVO\n 2<\/jats:sub>\n at post-HA, IHT\n 4<\/jats:sub>\n , and IHT\n 8<\/jats:sub>\n (\n P<\/jats:italic>\n = 0.67 and\n P<\/jats:italic>\n = 0.21, respectively). Significant HR\n max<\/jats:sub>\n differences were observed between baseline and post-HA tests (\n P<\/jats:italic>\n < 0.01). No significant group or time HR\n max<\/jats:sub>\n differences shown for post-HA, IHT\n 4<\/jats:sub>\n , and IHT\n 8<\/jats:sub>\n (\n P<\/jats:italic>\n = 0.59).\n <\/jats:p>\n <\/jats:sec>\n \n Conclusion:<\/jats:title>\n \n VO\n 2max<\/jats:sub>\n was not reduced among endurance runners after HA\/HAz and IHT potentially due to participants\u2019 similar aerobic training status and high aerobic fitness levels.\n <\/jats:p>\n <\/jats:sec>\n \n Clinical Relevance:<\/jats:title>\n \n HAz\/HA and IHT maintain aerobic power in endurance runners, with HAz\/HA procuring reductions in HR\n max<\/jats:sub>\n .\n <\/jats:p>\n <\/jats:sec>","DOI":"10.1177\/19417381241249470","type":"journal-article","created":{"date-parts":[[2024,5,6]],"date-time":"2024-05-06T05:19:51Z","timestamp":1714972791000},"page":"305-311","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":2,"title":["Effect of Heat Acclimatization, Heat Acclimation, and Intermittent Heat Training on Maximal Oxygen Uptake"],"prefix":"10.1177","volume":"17","author":[{"given":"Ryan A.","family":"Dunn","sequence":"first","affiliation":[{"name":"Sports Performance Laboratory, Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, Texas"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lauren A.","family":"Fry","sequence":"additional","affiliation":[{"name":"Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, Connecticut"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yasuki","family":"Sekiguchi","sequence":"additional","affiliation":[{"name":"Sports Performance Laboratory, Department of Kinesiology and Sport Management, Texas Tech University, Lubbock, Texas and Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, Connecticut"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Courteney L.","family":"Benjamin","sequence":"additional","affiliation":[{"name":"Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, Connecticut and Department of Kinesiology, Samford University, Birmingham, Alabama"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ciara N.","family":"Manning","sequence":"additional","affiliation":[{"name":"Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, Connecticut"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2174-8088","authenticated-orcid":false,"given":"Robert A.","family":"Huggins","sequence":"additional","affiliation":[{"name":"Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, Connecticut"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rebecca L.","family":"Stearns","sequence":"additional","affiliation":[{"name":"Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, Connecticut"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Douglas J.","family":"Casa","sequence":"additional","affiliation":[{"name":"Korey Stringer Institute, Department of Kinesiology, University of Connecticut, Storrs, Connecticut"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"179","published-online":{"date-parts":[[2024,5,6]]},"reference":[{"key":"e_1_3_2_2_2","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0073182"},{"key":"e_1_3_2_3_2","doi-asserted-by":"publisher","DOI":"10.1080\/23328940.2020.1735927"},{"key":"e_1_3_2_4_2","doi-asserted-by":"publisher","DOI":"10.1097\/00005768-200001000-00012"},{"key":"e_1_3_2_5_2","doi-asserted-by":"publisher","DOI":"10.3390\/ijerph18084366"},{"key":"e_1_3_2_6_2","doi-asserted-by":"publisher","DOI":"10.3389\/fphys.2019.01448"},{"key":"e_1_3_2_7_2","doi-asserted-by":"publisher","DOI":"10.3390\/cli3030492"},{"key":"e_1_3_2_8_2","doi-asserted-by":"publisher","DOI":"10.1097\/00003677-200407000-00005"},{"key":"e_1_3_2_9_2","volume-title":"Statistical Power Analysis for the Behavioural Sciences","author":"Cohen J.","year":"1988","unstructured":"Cohen J. 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