{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,14]],"date-time":"2026-10-14T10:29:30Z","timestamp":1791973770347,"version":"4.4.0"},"reference-count":40,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2025,6,4]],"date-time":"2025-06-04T00:00:00Z","timestamp":1748995200000},"content-version":"vor","delay-in-days":3,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2025,6,1]],"date-time":"2025-06-01T00:00:00Z","timestamp":1748736000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/501100000038","name":"Natural Sciences and Engineering Research Council of Canada","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100000038","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Scandinavian Med Sci Sports"],"published-print":{"date-parts":[[2025,6]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:p>\n                    Oxygen delivery and utilization to working muscle(s) are essential for sustained exercise performance. Higher contractile loads can occlude intramuscular blood vessels, limiting oxygen perfusion, while lighter loads minimize occlusion and allow perfusion. This study explored how external load impacted relative muscle endurance, work capacity, and muscle oxygenation in free\u2010flow and cuff\u2010occluded states to estimate the load at which a muscle occludes itself. Twenty\u2010nine participants (10 untrained (UT), 9 endurance\u2010trained (ET), 10 resistance\u2010trained (RT); 14 females, 15 males) completed repetitions to task failure at 15%, 20%, 25%, 30%, 40%, and 80% of their unilateral knee\u2010extension 1RM in free\u2010flow and cuff\u2010occluded states, with muscle oxygenation (SmO\n                    <jats:sub>2<\/jats:sub>\n                    ) measured using near\u2010infrared spectroscopy (NIRS). Compared to cuff\u2010occlusion, greater work capacity and SmO\n                    <jats:sub>2<\/jats:sub>\n                    were observed in the free\u2010flow state at 15%\u201330% 1RM (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05), but no differences were seen at 40% and 80% 1RM (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009\u2265\u20090.05). In the free\u2010flow state above 40% 1RM, RT participants performed more work than UT and ET (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05), with no differences between UT and ET (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009\u2265\u20090.05). At 25% and 30% 1RM, ET and RT participants performed more work than UT (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05), with no differences between ET and RT (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009\u2265\u20090.05). At 15% and 20% 1RM, ET participants performed more work than UT and RT (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05). These results suggest a load range of &gt;\u200930% but \u2264\u200940% 1RM may represent a phase transition in critical occluding tension of the quadriceps, with contractile induced occlusion occurring above this range, and perfusion occurring below.\n                  <\/jats:p>","DOI":"10.1111\/sms.70082","type":"journal-article","created":{"date-parts":[[2025,6,5]],"date-time":"2025-06-05T02:30:23Z","timestamp":1749090623000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["A Critical Occluding Tension Phase Transition Occurs Between 30% and 40%\n                    <scp>1RM<\/scp>\n                    in Dynamic Knee Extension Exercise"],"prefix":"10.1111","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0209-0786","authenticated-orcid":false,"given":"Matthew D.","family":"Fliss","sequence":"first","affiliation":[{"name":"School of Kinesiology, Faculty of Education The University of British Columbia  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Max J.","family":"Abercrombie","sequence":"additional","affiliation":[{"name":"School of Kinesiology, Faculty of Education The University of British Columbia  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Katrin G.","family":"Denson","sequence":"additional","affiliation":[{"name":"School of Kinesiology, Faculty of Education The University of British Columbia  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lucas","family":"Wiens","sequence":"additional","affiliation":[{"name":"School of Kinesiology, Faculty of Education The University of British Columbia  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5135-1191","authenticated-orcid":false,"given":"Justin M.","family":"Losciale","sequence":"additional","affiliation":[{"name":"Informatics, Decision\u2010Enhancement, and Analytic Sciences Center of Innovation George E. Wahlen Department of Veterans Affairs Medical Center  Salt Lake City Utah USA"},{"name":"Division of Epidemiology, Department of Internal Medicine University of Utah School of Medicine  Salt Lake City Utah USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Allyson M.","family":"Schweitzer","sequence":"additional","affiliation":[{"name":"School of Kinesiology, Faculty of Education The University of British Columbia  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ian F.","family":"Coccimiglio","sequence":"additional","affiliation":[{"name":"School of Biomedical Engineering, Faculty of Applied Science University of British Columbia  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8762-0960","authenticated-orcid":false,"given":"Thomas R.","family":"Tripp","sequence":"additional","affiliation":[{"name":"Faculty of Kinesiology University of Calgary  Calgary Alberta Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5449-3352","authenticated-orcid":false,"given":"Jamie F.","family":"Burr","sequence":"additional","affiliation":[{"name":"Department of Human Health and Nutritional Science University of Guelph  Guelph Ontario Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0377-5800","authenticated-orcid":false,"given":"Martin J.","family":"MacInnis","sequence":"additional","affiliation":[{"name":"Faculty of Kinesiology University of Calgary  Calgary Alberta Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3843-6806","authenticated-orcid":false,"given":"Cameron J.","family":"Mitchell","sequence":"additional","affiliation":[{"name":"School of Kinesiology, Faculty of Education The University of British Columbia  Vancouver British Columbia Canada"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,6,4]]},"reference":[{"issue":"1","key":"e_1_2_12_2_1","first-page":"11","article-title":"Relationship Between Repetitions and Selected Percentages of One Repetition Maximum","volume":"1","author":"Hoeger W. 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