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In histological sections, motor unit remodelling is reflected by increased fibre type grouping. While regular exercise may not attenuate the loss of motor units during ageing, it has been suggested to facilitate reinnervation resulting in larger motor units, and a higher number and larger fibre type groups in histological sections of muscles from aged individuals.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>In a 10\u2010year follow\u2010up study, we assessed changes in the prevalence and size of fibre type groups in the vastus lateralis muscle from 34 male masters sprinters (40\u201385\u00a0years at start).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Over the 10\u00a0years, there was an ageing\u2010related reduction in performance in the 60\u2010m sprint (<jats:italic>P<\/jats:italic>\u00a0&lt;\u00a00.001) without significant changes in fibre type composition and fibre cross\u2010sectional area. Neither the number of fibre type groups, defined as a fibre surrounded exclusively by fibres of the same type, nor the group size changed significantly in the 10\u2010year period.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>These histological data show that there is limited to no significant fibre type grouping over a 10\u2010year period in masters athletes who continued sprint run training. This observation challenges the paradigm that ageing, at least in systematically trained sprinters, is associated with motor unit remodelling.<\/jats:p><\/jats:sec>","DOI":"10.1002\/jcsm.13416","type":"journal-article","created":{"date-parts":[[2024,1,17]],"date-time":"2024-01-17T03:58:22Z","timestamp":1705463902000},"page":"552-561","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["No ageing\u2010related increase in fibre type grouping in sprint\u2010trained masters runners: A 10\u2010year follow\u2010up study"],"prefix":"10.1002","volume":"15","author":[{"given":"Guy Anselme Mpaka","family":"Messa","sequence":"first","affiliation":[{"name":"Higher Institute of Medical Technology ISTM\u2010Kinshasa  Kinshasa Democratic Republic of Congo"},{"name":"Faculty of Medicine University Kasa\u2010Vubu (UKV)  Boma Democratic Republic of Congo"},{"name":"Faculty of Medicine University de Bandundu (UNIBAND)  Bandundu Democratic Republic of Congo"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2550-0784","authenticated-orcid":false,"given":"Marko T.","family":"Korhonen","sequence":"additional","affiliation":[{"name":"Gerontology Research Center, Faculty of Sport and Health Sciences University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7399-4841","authenticated-orcid":false,"given":"Hans","family":"Degens","sequence":"additional","affiliation":[{"name":"Department of Life Sciences, Institute of Sport Manchester Metropolitan University  Manchester UK"},{"name":"Institute of Sport Science and Innovations Lithuanian Sports University  Kaunas 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