{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,27]],"date-time":"2026-08-27T20:21:29Z","timestamp":1787862089574,"version":"build-2784847793"},"reference-count":46,"publisher":"Human Kinetics","issue":"9","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2026,9,1]]},"abstract":"\n \n Purpose<\/jats:italic>\n <\/jats:bold>\n :<\/jats:italic>\n This study assessed the physiological durability of International and National, Junior and U23 triathletes following a simulated sprint-triathlon cycle.\n \n Methods<\/jats:italic>\n <\/jats:bold>\n :<\/jats:italic>\n Eight male International and National Junior and U23 triathletes (aged: 20.3 [1.5]\u00a0y,\n \n : 66.0 [3.9]\u00a0mL\u00b7kg\n \u22121<\/jats:sup>\n \u00b7min\n \u22121<\/jats:sup>\n , 4.56 [0.24]\u00a0L\u00b7min\n \u22121<\/jats:sup>\n ) attended the laboratory on 3 occasions. Visit 1 comprised an incremental ramp test and time to task failure to establish running\n \n , gas exchange threshold (GET), respiratory compensatory point (RCP), and associated velocities. Visit 2 determined cycling\n \n , GET, RCP, and associated power during an incremental ramp protocol and a 10-second all-out sprint. Visit 3 consisted of a stochastic simulated sprint triathlon cycling protocol varying between power outputs associated with 50%\n \n and 10-second mean maximal power, 110% RCP, and 110% GET, prior to transitioning to the treadmill replicating visit 1 to determine \u201cfatigued\u201d running physiology and time to task failure (TTF).\n \n Results<\/jats:italic>\n <\/jats:bold>\n :<\/jats:italic>\n Significant changes in:\n \n (mL\u00b7kg\n \u22121<\/jats:sup>\n \u00b7min\n \u22121<\/jats:sup>\n ) (\n P<\/jats:italic>\n \u2009=\u2009.006,\n d<\/jats:italic>\n \u2009=\u2009\u22121.206 [\u22120.254, \u22122.112]),\n \n (km\u00b7h\n \u22121<\/jats:sup>\n ) (\n P<\/jats:italic>\n \u2009=\u2009.008,\n d<\/jats:italic>\n \u2009=\u2009\u22121.110 [\u22120.190, \u22121.985]), GET expressed as a percentage of\n \n (\n P<\/jats:italic>\n \u2009=\u2009.022,\n d<\/jats:italic>\n \u2009=\u20090.866 [0.021, 1.668),\n \n at RCP (mL\u00b7kg\n \u22121<\/jats:sup>\n \u00b7min\n \u22121<\/jats:sup>\n ) (\n P<\/jats:italic>\n \u2009=\u2009.020,\n d<\/jats:italic>\n \u2009=\u2009\u22120.894 [\u22120.042, \u22121.704]), vRCP (km\u00b7h\n \u22121<\/jats:sup>\n ) (\n P<\/jats:italic>\n \u2009=\u2009.041,\n d<\/jats:italic>\n \u2009=\u2009\u22120.717 [\u22120.87\u20131.482]), and TTF (in seconds) (\n P<\/jats:italic>\n \u2009=\u2009.022,\n d<\/jats:italic>\n \u2009=\u2009\u22120.866 [\u22120.21, \u22121.668]) were observed in a fatigued state.\n \n Conclusion<\/jats:italic>\n <\/jats:bold>\n :<\/jats:italic>\n A simulated sprint-triathlon cycle elicits significant declines in Junior and U23 triathletes running physiology and performance indices. Substantial interindividual responses across physiological variables highlights the necessity for durability profiling within sprint-distance triathletes.\n <\/jats:p>","DOI":"10.1123\/ijspp.2025-0469","type":"journal-article","created":{"date-parts":[[2026,5,7]],"date-time":"2026-05-07T16:48:15Z","timestamp":1778172495000},"page":"1004-1012","source":"Crossref","is-referenced-by-count":0,"title":["Durability of International and National Junior and U23 Triathletes: A Simulated Stochastic Sprint Triathlon Cycle Elicits Significant Declines in Running Physiology and Performance Indices"],"prefix":"10.1123","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0009-0004-1271-1819","authenticated-orcid":true,"given":"Jamie O.","family":"Langley","sequence":"first","affiliation":[{"name":"Department of Higher Education Sport, Loughborough College, Loughborough, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Marcos","family":"Knight","sequence":"additional","affiliation":[{"name":"Department of Higher Education Sport, Loughborough College, Loughborough, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"William","family":"Bloom","sequence":"additional","affiliation":[{"name":"Department of Higher Education Sport, Loughborough College, Loughborough, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-4295-8431","authenticated-orcid":true,"given":"Harry","family":"O\u2019Brien","sequence":"additional","affiliation":[{"name":"Department of Higher Education Sport, Loughborough College, Loughborough, United Kingdom"},{"name":"School of Sport, Exercise and Health Sciences, Loughborough University, Loughborough, United Kingdom"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"issue":"1","key":"r1","series-title":"J Physiol","doi-asserted-by":"publisher","first-page":"35","DOI":"10.1113\/jphysiol.2007.143834","article-title":"Endurance exercise performance: the physiology of champions","volume":"586","author":"Joyner MJ","year":"2008","unstructured":"Joyner MJ, Coyle EF. 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