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To investigate this, we subjected 12 Under\u201020 Danish national team ice hockey players (age 18\u00a0\u00b1\u00a01 years, mean\u00a0\u00b1\u00a0SD) to 4\u00a0weeks of SET, consisting of 6\u201310\u00a0\u00d7\u00a020\u00a0s skating bouts at maximal effort interspersed by 2\u00a0min of recovery conducted three times weekly. This was followed by 4\u00a0weeks of regular training (follow\u2010up). We assessed resting cardiac function and dimensions using transthoracic echocardiography and quantified total blood volume with the carbon monoxide rebreathing technique at three time points: before SET, after SET and after the follow\u2010up period. After SET, stroke volume had increased by 10 (2\u201318) mL (mean (95% CI)), left atrial end\u2010diastolic volume by 10 (3\u201317) mL, and circumferential strain improved by 0.9%\u2010points (1.7\u20130.1) (all <jats:italic>P\u00a0<\/jats:italic>&lt;\u00a00.05). At follow\u2010up, circumferential strain and left atrial end\u2010diastolic volume were reverted to baseline levels, while stroke volume remained elevated. Blood volume and morphological parameters for the left ventricle, including mass and end\u2010diastolic volume, did not change during the study. In conclusion, our findings demonstrate that a brief period of SET elicits beneficial central cardiac adaptations in elite ice hockey players independent of changes in blood volume.<\/jats:p>","DOI":"10.1113\/ep091674","type":"journal-article","created":{"date-parts":[[2024,7,17]],"date-time":"2024-07-17T04:40:07Z","timestamp":1721191207000},"page":"755-766","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Intensified training augments cardiac function, but not blood volume, in male youth elite ice hockey team players"],"prefix":"10.1113","volume":"110","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6403-1100","authenticated-orcid":false,"given":"Mads","family":"Fischer","sequence":"first","affiliation":[{"name":"The August Krogh Section for Human Physiology, Department of Nutrition, Exercise and Sports (NEXS) University of Copenhagen  Copenhagen 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and Xploration), Institute of Sports Science Leibniz University  Hannover Germany"},{"name":"Department of Medicine, Division of Cardiology Columbia University Irving Medical Center  New York New York USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1749-8533","authenticated-orcid":false,"given":"Magni","family":"Mohr","sequence":"additional","affiliation":[{"name":"Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC) University of Southern Denmark  Odense Denmark"},{"name":"Centre of Health Sciences, Faculty of Health University of the Faroe Islands  T\u00f3rshavn Faroe Islands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2702-6695","authenticated-orcid":false,"given":"Kate A.","family":"Wickham","sequence":"additional","affiliation":[{"name":"The August Krogh Section for Human Physiology, Department of Nutrition, Exercise and Sports 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