{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,10]],"date-time":"2026-06-10T03:30:13Z","timestamp":1781062213519,"version":"3.54.1"},"reference-count":32,"publisher":"Human Kinetics","issue":"11","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,11,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Purpose:<\/jats:bold><\/jats:italic> To investigate differences in time to exhaustion (TTE), O<jats:sub>2<\/jats:sub> uptake (<jats:inline-formula\/>), and accumulated O<jats:sub>2<\/jats:sub> deficit (<jats:inline-formula\/>) between competitive and recreational cross-country (XC) skiers during an intermittent-interval protocol standardized for maximal aerobic power (MAP). <jats:italic><jats:bold>Methods:<\/jats:bold><\/jats:italic> Twelve competitive (maximal <jats:inline-formula\/> <jats:inline-formula\/>) and 10 recreational (<jats:inline-formula\/>) male XC skiers participated. All tests were performed on a rollerski treadmill in the V2 ski-skating technique. To quantify MAP and maximal accumulated oxygen deficit\u00a0(MAOD), the skiers performed a steady-state submaximal test followed by a 1000-m time trial. After a 60-minute break, TTE, <jats:inline-formula\/>, and accumulated <jats:inline-formula\/> were measured during an intermittent-interval protocol (40-s work and 20-s recovery), which was individually tailored to 120% and 60% of each subject\u2019s MAP. <jats:italic><jats:bold>Results:<\/jats:bold><\/jats:italic> During the 1000-m time trial, the competitive skiers had 21% (95% CI, 12%\u201330%) shorter finish time and 24% (95% CI, 14%\u201334%) higher MAP (all <jats:italic>P<\/jats:italic>\u2009&lt;\u2009.01) than the recreational skiers. No difference was observed in relative exercise intensity (average power\/MAP; <jats:italic>P<\/jats:italic>\u2009=\u2009.28), MAOD (<jats:italic>P<\/jats:italic>\u2009=\u2009.18), or fractional utilization of <jats:inline-formula\/>. During the intermittent-interval protocol, the competitive skiers had 34% (95% CI, 3%\u201365%) longer TTE (<jats:italic>P<\/jats:italic>\u2009=\u2009.03) and accumulated 61% (95% CI, 27%\u201395%) more <jats:inline-formula\/> (<jats:italic>P<\/jats:italic>\u2009=\u2009.001) than the recreational skiers during work phases. <jats:italic><jats:bold>Conclusions:<\/jats:bold><\/jats:italic> Competitive XC skiers have longer TTE and accumulate more <jats:inline-formula\/> than recreational XC skiers during an intermittent-interval protocol at similar intensity relative to MAP. This implies that performance in intermittent endurance sports is related to the ability to repeatedly recharge fractions of MAOD.<\/jats:p>","DOI":"10.1123\/ijspp.2022-0487","type":"journal-article","created":{"date-parts":[[2023,8,11]],"date-time":"2023-08-11T18:24:50Z","timestamp":1691778290000},"page":"1246-1253","source":"Crossref","is-referenced-by-count":4,"title":["Competitive Cross-Country Skiers Have Longer Time to Exhaustion Than Recreational Cross-Country Skiers During Intermittent Work Intervals Normalized to Their Maximal Aerobic Power"],"prefix":"10.1123","volume":"18","author":[{"given":"Eivind","family":"Holsbrekken","sequence":"first","affiliation":[{"name":"Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"\u00d8yvind","family":"Gl\u00f8ersen","sequence":"additional","affiliation":[{"name":"Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Magne","family":"Lund-Hansen","sequence":"additional","affiliation":[{"name":"Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8646-7477","authenticated-orcid":true,"given":"Thomas","family":"Losnegard","sequence":"additional","affiliation":[{"name":"Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"issue":"4","key":"r1","series-title":"Med Sci Sports Exerc","first-page":"983","article-title":"Oxygen demand, uptake, and deficits in elite cross-country skiers during a 15-km race","volume":"52","author":"Gl\u00f8ersen \u00d8","year":"2020","unstructured":"Gl\u00f8ersen \u00d8, Gilgien M, Dysthe DK, Malthe-S\u00f8renssen A, Losnegard T. 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