{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T19:25:09Z","timestamp":1793042709170,"version":"4.5.0"},"reference-count":50,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2020,7,4]],"date-time":"2020-07-04T00:00:00Z","timestamp":1593820800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["physoc.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Experimental Physiology"],"published-print":{"date-parts":[[2021,1]]},"abstract":"\n New Findings<\/jats:title>\n \n \n \n \n What is the central question of this study?<\/jats:bold>\n <\/jats:p>\n Do haemoglobin mass and red blood cell volume increase in elite cyclists training in a hot environment compared to a control group training at normal temperature?<\/jats:p>\n <\/jats:list-item>\n \n \n What is the main finding and its importance?<\/jats:bold>\n <\/jats:p>\n Five\u00a0weeks of heat training increases haemoglobin mass in elite cyclists. There are small to intermediate effect sizes for exercise parameters favouring heat training.<\/jats:p>\n <\/jats:list-item>\n <\/jats:list>\n <\/jats:p>\n <\/jats:sec>\n \n Abstract<\/jats:title>\n \n In this study we tested the hypothesis that performing 1\u00a0h of regular light exercise in a heat chamber (HEAT; 37.8\u00a0\u00b1\u00a00.5\u00b0C; 65.4\u00a0\u00b1\u00a01.8% humidity) 5\u00a0times\u00a0week\n \u22121<\/jats:sup>\n for a total of 5\u00a0weeks increases haemoglobin mass (Hb\n mass<\/jats:sub>\n ) and exercise performance in elite cyclists (\n \n \u00a0=\u00a076.2\u00a0\u00b1\u00a07.6\u00a0ml\u00a0min\n \u22121<\/jats:sup>\n \u00a0kg\n \u22121<\/jats:sup>\n ). Twenty\u2010three male volunteers were assigned to HEAT (\n n<\/jats:italic>\n \u00a0=\u00a011) or CON (\n n<\/jats:italic>\n \u00a0=\u00a012; 15.5\u00a0\u00b1\u00a00.1\u00b0C; 25.1\u00a0\u00b1\u00a00.0% humidity) training groups. Hb\n mass<\/jats:sub>\n was determined before and after the intervention period in conjunction with an extensive exercise test protocol (conducted at 16\u201319\u00b0C). HEAT increased (\n P<\/jats:italic>\n \u00a0<\u00a00.05) Hb\n mass<\/jats:sub>\n by 42\u00a0g from 893\u00a0\u00b1\u00a078 to 935\u00a0\u00b1\u00a0108\u00a0g whereas Hb\n mass<\/jats:sub>\n remained unchanged (+6\u00a0g) in CON. Furthermore, statistical analysis revealed a time\u2013group interaction (\n P<\/jats:italic>\n \u00a0<\u00a00.05). The greater increase in Hb\n mass<\/jats:sub>\n in HEAT, however, did not manifest in a greater increase in\n \n (225\u00a0\u00b1\u00a0274\u00a0ml\u00a0min\n \u22121<\/jats:sup>\n in HEAT and 161\u00a0\u00b1\u00a0202\u00a0ml\u00a0min\n \u22121<\/jats:sup>\n in CON). While HEAT reduced (\n P<\/jats:italic>\n \u00a0<\u00a00.05) lactate levels during some of the submaximal exercise tests, there was no statistical difference between other performance parameters. There were, however, small to intermediate effect sizes favouring HEAT for lactate threshold power output (2.8\u00a0\u00b1\u00a03.9\n vs<\/jats:italic>\n . \u22120.4\u00a0\u00b1\u00a05.1% change, effect size (ES)\u00a0=\u00a00.34), gross economy in the fatigued state (0.19\u00a0\u00b1\u00a00.42\n vs<\/jats:italic>\n . \u22120.12\u00a0\u00b1\u00a00.49%\u2010point change, ES\u00a0=\u00a00.52) and 15\u00a0min mean power (6.9\u00a0\u00b1\u00a08.4\u00a0\n vs<\/jats:italic>\n . 3.4\u00a0\u00b1\u00a05.1% increase, ES\u00a0=\u00a00.22). This study demonstrates an increase in Hb\n mass<\/jats:sub>\n and small to intermediate effect sizes on exercise variables in elite cyclists following a 5\u2010week heat training intervention.\n <\/jats:p>\n <\/jats:sec>","DOI":"10.1113\/ep088544","type":"journal-article","created":{"date-parts":[[2020,5,21]],"date-time":"2020-05-21T07:55:45Z","timestamp":1590047745000},"page":"316-327","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":63,"title":["Five weeks of heat training increases haemoglobin mass in elite cyclists"],"prefix":"10.1113","volume":"106","author":[{"given":"Bent R.","family":"R\u00f8nnestad","sequence":"first","affiliation":[{"name":"Innland University of Applied Sciences Lillehammer Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H\u00e5vard","family":"Hamarsland","sequence":"additional","affiliation":[{"name":"Innland University of Applied Sciences Lillehammer 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