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Forty six athletes ranging from recreational to elite level, participated in either a run (RUN) or a ski ergometer (SKI) observational study.<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Methods<\/jats:title>\n            <jats:p>The participants performed pre- and post-tests in; 800-m time trial (800TT), 100-m time trial (MSS or MSP), peak oxygen uptake (VO<jats:sub>2peak<\/jats:sub>), oxygen cost of running (<jats:italic>C<\/jats:italic>\n              <jats:sub>R<\/jats:sub>) or double poling (<jats:italic>C<\/jats:italic>\n              <jats:sub>DP<\/jats:sub>), time to exhaustion (TTE) at 130% maximal aerobic speed (MAS) or maximal aerobic power (MAP), and maximal accumulated oxygen deficit (MAOD) in SKI. They also performed one repetition maximum (1RM), half-squat (RUN) or 1RM lat pull-down (SKI).<\/jats:p>\n          <\/jats:sec>\n          <jats:sec>\n            <jats:title>Results<\/jats:title>\n            <jats:p>Moderate correlations were found between changes in both MAP and maximal strength and changes in 800TT for SKI (<jats:italic>r\u2009=\u2009<\/jats:italic>\u2212 0.51 and <jats:italic>r\u2009=\u2009<\/jats:italic>\u2212 0.51, respectively, <jats:italic>p\u2009&lt;\u2009<\/jats:italic>0.05). For RUN, MAS and the 0.8 MAS\u2009+\u20090.2 MSS equation correlated (<jats:italic>r\u2009=\u2009<\/jats:italic>\u2212 0.71 and <jats:italic>r\u2009=\u2009<\/jats:italic>\u2212 0.73, respectively, <jats:italic>p\u2009&lt;\u2009<\/jats:italic>0.01) with 800TT. VO<jats:sub>2peak<\/jats:sub> was the most important contributor to MAS improvements (RUN) while <jats:italic>C<\/jats:italic>\n              <jats:sub>DP<\/jats:sub> was the most important contributor to MAP improvements (SKI). No correlations were found between changes in TTE at 130% MAS or MAP and, or MAOD, and changes in 800TT, for neither RUN nor SKI. The results from the present study suggest focusing on training to improve maximal oxygen uptake (VO<jats:sub>2max<\/jats:sub>), work economy and maximal sprint speed to improve performance in middle-distance running and ski sprinting.<\/jats:p>\n          <\/jats:sec>","DOI":"10.1007\/s00421-025-05765-7","type":"journal-article","created":{"date-parts":[[2025,4,18]],"date-time":"2025-04-18T13:13:32Z","timestamp":1744982012000},"page":"2805-2821","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Determining physiologic variables for changes in 800-m running and 800-m ski ergometer performance"],"prefix":"10.1007","volume":"125","author":[{"ORCID":"https:\/\/orcid.org\/0009-0005-1960-4175","authenticated-orcid":false,"given":"Lars Erik","family":"Gjerl\u00f8w","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Arnstein","family":"Sunde","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva Maria","family":"St\u00f8a","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan","family":"Helgerud","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jan-Michael","family":"Johansen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Henrik","family":"Hjortland","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00d8yvind","family":"St\u00f8ren","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,4,18]]},"reference":[{"key":"5765_CR1","doi-asserted-by":"publisher","first-page":"2635","DOI":"10.1249\/mss.0000000000002755","volume":"12","author":"P Bellinger","year":"2021","unstructured":"Bellinger P, Derave W, Lievens E, Kennedy B, Arnold B, Rice H, Minahan C (2021a) Determinants of performance in paced and maximal 800-m running time trials. 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