{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T10:40:13Z","timestamp":1780569613538,"version":"3.54.1"},"reference-count":63,"publisher":"Wiley","issue":"21","license":[{"start":{"date-parts":[[2024,11,10]],"date-time":"2024-11-10T00:00:00Z","timestamp":1731196800000},"content-version":"vor","delay-in-days":9,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["physoc.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Physiological Reports"],"published-print":{"date-parts":[[2024,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>We evaluated associations between muscle phenotype, positional role, and on\u2010ice performance in male U20 Danish national team ice hockey players. Sixteen players (10 forwards, six defensemen) participated in a game with activity tracking. Resting thigh muscle biopsies were analyzed for metabolic enzyme activity and protein expression linked to performance. On\u2010ice intermittent exercise capacity, repeated sprint ability, and maximal isometric knee\u2010extensor torque were also assessed. No significant position\u2010specific muscle phenotype characteristics were found, but forwards generally exhibited higher levels of several membrane proteins (<jats:italic>p<\/jats:italic>\u2009=\u20090.100\u20130.991). NAK\u03b1<jats:sub>2<\/jats:sub>, NAK\u2211, K<jats:sub>ATP<\/jats:sub>, ClC\u20101, and NHE1 showed significant correlations with total distance (<jats:italic>r<\/jats:italic>\u2009=\u20090.52\u20130.59, <jats:italic>p<\/jats:italic>\u2009=\u20090.016\u20130.046), however, within positions these only persisted for K<jats:sub>ATP<\/jats:sub> (<jats:italic>r<\/jats:italic>\u2009=\u20090.70, <jats:italic>p<\/jats:italic>\u2009=\u20090.024) and NAK\u03b1<jats:sub>2<\/jats:sub> (<jats:italic>r<\/jats:italic>\u2009=\u20090.57, <jats:italic>p<\/jats:italic>\u2009=\u20090.085) in forwards, where CS enzyme activity also displayed a strong association with distance covered (<jats:italic>r<\/jats:italic>\u2009=\u20090.75, <jats:italic>p<\/jats:italic>\u2009=\u20090.019). For high\u2010intensity skating, NAK\u03b1<jats:sub>2<\/jats:sub> (<jats:italic>r<\/jats:italic>\u2009=\u20090.56, <jats:italic>p<\/jats:italic>\u2009=\u20090.025) and K<jats:sub>ATP<\/jats:sub> (<jats:italic>r<\/jats:italic>\u2009=\u20090.50, <jats:italic>p<\/jats:italic>\u2009=\u20090.048) similarly exhibited the strongest associations, persisting within forwards (<jats:italic>r<\/jats:italic>\u2009=\u20090.63, <jats:italic>p<\/jats:italic>\u2009=\u20090.052 and <jats:italic>r<\/jats:italic>\u2009=\u20090.72; <jats:italic>p<\/jats:italic>\u2009=\u20090.018, respectively). In conclusion, although several muscle proteins involved in ion and metabolic regulation were associated with performance, only NAK\u03b1<jats:sub>2<\/jats:sub> and K<jats:sub>ATP<\/jats:sub> displayed consistent relationships within positions. Moreover, CS enzyme activity was strongly related to total distance within forwards, coherent with the proposed importance of oxidative capacity in intense intermittent exercise.<\/jats:p>","DOI":"10.14814\/phy2.70081","type":"journal-article","created":{"date-parts":[[2024,11,11]],"date-time":"2024-11-11T05:11:04Z","timestamp":1731301864000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Associations between skeletal muscle phenotype, positional role, and on\u2010ice performance in elite male ice hockey players"],"prefix":"10.14814","volume":"12","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9936-2009","authenticated-orcid":false,"given":"Jeppe F.","family":"Vigh\u2010Larsen","sequence":"first","affiliation":[{"name":"Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC) University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3901-5088","authenticated-orcid":false,"given":"Hallur","family":"Thorsteinsson","sequence":"additional","affiliation":[{"name":"Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC) University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7503-6815","authenticated-orcid":false,"given":"Martin","family":"Thomassen","sequence":"additional","affiliation":[{"name":"Department of Nutrition, Exercise and Sports University of Copenhagen  Copenhagen Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8887-8875","authenticated-orcid":false,"given":"Jeppe","family":"Panduro","sequence":"additional","affiliation":[{"name":"Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC) University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8146-5170","authenticated-orcid":false,"given":"Bj\u00f8rn","family":"Fristrup","sequence":"additional","affiliation":[{"name":"Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC) University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0192-8981","authenticated-orcid":false,"given":"Morten B.","family":"Randers","sequence":"additional","affiliation":[{"name":"Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC) University of Southern Denmark  Odense Denmark"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2620-2041","authenticated-orcid":false,"given":"Jens 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