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Wetsuits are commonly used in open-water swimming and are mandated in some situations. This study investigates the effects of cold-water wetsuited swimming on dexterity. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Five male and 4 female trained swimmers were recruited for this cohort crossover study. Following dual-energy X-ray absorptiometry scans to determine body composition, they swam in a freshwater lake on 7 occasions with water temperatures between 24.5\u00a0\u00b0C and 8.4\u00a0\u00b0C. Dexterity was measured preswim and postswim with a \u201cnut\u2013washer\u2013bolt assembly time test\u201d and cognition with a Stroop test. Core and peripheral body temperatures were continuously monitored. Effects were analyzed by linear mixed-model regression. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Pre\u2013post swim difference in time to complete the nut\u2013bolt assembly increased as water temperatures decreased (1.0\u00a0s, 95% CI, 0.5\u20131.5 per 1\u00a0\u00b0C, <jats:italic>P<\/jats:italic>\u2009&lt;\u2009.0001; <jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup>\u2009=\u2009.456), to a maximum of 14.7 seconds (95% CI, 3.3\u201326.0). This represented a 47.5% increase in assembly time from 24.5\u00a0\u00b0C to 8.4\u00a0\u00b0C, which we consider to be of practical significance. Decreased dexterity was associated with decreased forearm and scapular temperature and decreased cognitive function. Body composition did not affect dexterity, cognitive function, or body temperature during swims. Water temperature did not affect swim speed. <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> Despite the use of wetsuits, manual dexterity decreased with cold-water swimming. Swimmers, triathletes, and event organizers should consider the implications for safety, performance, and equipment utilization.<\/jats:p>","DOI":"10.1123\/ijspp.2024-0100","type":"journal-article","created":{"date-parts":[[2024,12,21]],"date-time":"2024-12-21T09:42:16Z","timestamp":1734774136000},"page":"213-223","source":"Crossref","is-referenced-by-count":3,"title":["Manual Dexterity in Open-Water Wetsuited Swimmers: A Cohort Crossover Study"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3225-6321","authenticated-orcid":true,"given":"William J.","family":"Morton","sequence":"first","affiliation":[{"name":"Department of Anesthesiology and Intensive Care, Akershus University Hospital, L\u00f8renskog, Norway"},{"name":"Department of Vascular Surgery, Oslo University Hospital, Oslo, Norway"},{"name":"Institute of Clinical Medicine, University of Oslo, Oslo, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3860-3988","authenticated-orcid":true,"given":"J\u00f8rgen","family":"Melau","sequence":"additional","affiliation":[{"name":"Department of Vascular Surgery, Oslo University Hospital, Oslo, Norway"},{"name":"Norwegian Armed Forces, Joint Medical Services, Sessvollmoen, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Roar A.","family":"Olsen","sequence":"additional","affiliation":[{"name":"Norwegian Swimming Federation, Oslo, Norway"},{"name":"Fet Sv\u00f8mmeklubb, Fetsund, Norway"},{"name":"Oter\u2019n, Gan, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4169-1544","authenticated-orcid":true,"given":"Ole Martin","family":"L\u00f8vvik","sequence":"additional","affiliation":[{"name":"SINTEF Materials Physics, Oslo, Norway"},{"name":"Department of Physics, Center for Materials Science and Nanotechnology, University of Oslo, Oslo, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0224-7854","authenticated-orcid":true,"given":"Jonny","family":"Hisdal","sequence":"additional","affiliation":[{"name":"Department of Vascular Surgery, Oslo University Hospital, Oslo, Norway"},{"name":"Institute of Clinical Medicine, University of Oslo, Oslo, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4524-2268","authenticated-orcid":true,"given":"Signe","family":"S\u00f8vik","sequence":"additional","affiliation":[{"name":"Department of Anesthesiology and Intensive Care, Akershus University Hospital, L\u00f8renskog, Norway"},{"name":"Institute of Clinical Medicine, University of Oslo, Oslo, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"key":"r1","series-title":"Essentials of Sea Survival","author":"Golden F","year":"2002","unstructured":"Golden F, Tipton M. 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