{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,18]],"date-time":"2026-08-18T01:26:35Z","timestamp":1787016395745,"version":"build-2736575974"},"reference-count":39,"publisher":"Human Kinetics","issue":"7","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,7,1]]},"abstract":"\n \n Purpose<\/jats:bold>\n :\n <\/jats:italic>\n This study aimed to investigate oxygen\/energy cost (OC\/EC) of running and substrate utilization before and after strenuous cycling in well-trained junior triathletes and the relevance of changes in these variables for fatigued running performance.\n \n Methods<\/jats:bold>\n :\n <\/jats:italic>\n Nineteen junior squad triathletes (4 female, 15 male; 17.2 [1.8]\u00a0y; maximal oxygen uptake (\n \n ) 61.4 [5.1]\u00a0mL\u00b7kg\n \u22121<\/jats:sup>\n \u00b7min\n \u22121<\/jats:sup>\n ) completed 3 submaximal running steps (2.8\u00a0m\u00b7s\n \u22121<\/jats:sup>\n , +0.4\u00a0m\u00b7s\n \u22121<\/jats:sup>\n , and 5\u00a0min) under fresh conditions, followed by an incremental cycling test (\u223c2\u00a0W\u00b7kg\n \u22121<\/jats:sup>\n , +20\u00a0W, and 3\u00a0min) to exhaustion. Afterward, they performed another incremental running test to exhaustion under fatigued conditions for\n \n , OC, and time-to-exhaustion assessment. During both runs, OC, EC, and carbohydrate\/fat oxidation (CHO\/FO) were assessed.\n \n Results<\/jats:bold>\n :\n <\/jats:italic>\n Contrary to trivial\/small average changes in OC (210 [15] to 209 [14]\u00a0mL\u00b7kg\n \u22121<\/jats:sup>\n \u00b7km\n \u22121<\/jats:sup>\n ,\n P<\/jats:italic>\n \u2009=\u2009.71) and EC (4.75 [0.33] to 4.59 [0.29]\u00a0kJ\u00b7kg\n \u22121<\/jats:sup>\n \u00b7km\n \u22121<\/jats:sup>\n ,\n P<\/jats:italic>\n \u2009=\u2009.02), CHO decreased (2.96 [0.68] to 2.08 [0.68]\u00a0g\u00b7min\n \u22121<\/jats:sup>\n ) while FO increased (0.15 [0.13] to 0.48 [0.22]\u00a0g\u00b7min\n \u22121<\/jats:sup>\n ) significantly from fresh to fatigued running (\n P<\/jats:italic>\n \u2009<\u2009.001). Besides\n \n (\n r<\/jats:italic>\n \u2009=\u2009.68,\n P<\/jats:italic>\n \u2009=\u2009.002), the changes in CHO (\n r<\/jats:italic>\n \u2009=\u2009\u2013.60,\n P<\/jats:italic>\n \u2009=\u2009.01) and FO (\n r<\/jats:italic>\n \u2009=\u2009.67,\n P<\/jats:italic>\n \u2009=\u2009.003) were significantly correlated with fatigued time to exhaustion (1715 [172]\u00a0s). Multiple regression and commonality analysis identified\n \n , OC, and the change in FO as the best model for time to exhaustion (\n R<\/jats:italic>\n 2<\/jats:sup>\n \u2009=\u200988%).\n \n Conclusion<\/jats:bold>\n :\n <\/jats:italic>\n Despite trivial\/small changes in OC\/EC from fresh to fatigued running, a pronounced shift in substrate utilization from CHO to FO was evident in junior triathletes, which was also associated with fatigued running performance.\n <\/jats:p>","DOI":"10.1123\/ijspp.2025-0009","type":"journal-article","created":{"date-parts":[[2025,5,14]],"date-time":"2025-05-14T13:48:49Z","timestamp":1747230529000},"page":"907-917","source":"Crossref","is-referenced-by-count":4,"title":["Durability in Youth Squad Triathletes\u2014Influence of Strenuous Cycling on Subsequent Running Performance, Economy, and Substrate Utilization"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0009-0000-0986-8613","authenticated-orcid":true,"given":"Greta","family":"R\u00f6hrs","sequence":"first","affiliation":[{"name":"Section Exercise Physiology, German Sport University, Cologne, Germany"},{"name":"German Research Center of Elite Sport, German Sport University, Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6845-9067","authenticated-orcid":true,"given":"Sebastian","family":"Keller","sequence":"additional","affiliation":[{"name":"Section Exercise Physiology, German Sport University, Cologne, Germany"},{"name":"German Research Center of Elite Sport, German Sport University, Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8682-5916","authenticated-orcid":true,"given":"Patrick","family":"Wahl","sequence":"additional","affiliation":[{"name":"Section Exercise Physiology, German Sport University, Cologne, Germany"},{"name":"German Research Center of Elite Sport, German Sport University, Cologne, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"issue":"3","key":"r1","series-title":"J Strength Cond Res","doi-asserted-by":"publisher","first-page":"622","DOI":"10.1519\/JSC.0b013e3182a73e70","article-title":"A time-saving method to assess power output at lactate threshold in well-trained and elite cyclists","volume":"28","author":"St\u00f8ren \u00d8","year":"2014","unstructured":"St\u00f8ren \u00d8, R\u00f8nnestad BR, Sunde A, Hansen J, Ellefsen S, Helgerud J. 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