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The present study investigated the test\u2013retest reliability and sensitivity (smallest detectable difference: SDD) of selected physical performance tests commonly used in clinical rehabilitation, including tests of habitual and maximal walking speed, walking endurance capacity, handgrip strength (HGS), and lower limb muscle power (Sit\u2010to\u2010Stand (STS), stair climb) in adults with severe obesity meeting the criteria for bariatric surgery. Thirty\u2010two adults (BMI 43.8\u2009\u00b1\u20096.6\u2009kg\/m<jats:sup>2<\/jats:sup>) were enrolled in the study. Participants were assessed in three separate test sessions performed at the same time of day (\u00b12\u2009h) separated by 3 to 7\u2009days. Habitual and maximal walking speed, walking endurance capacity, lower limb muscle power evaluated by stair climb and STS performance, and HGS demonstrated good\u2010to\u2010excellent inter\u2010session reproducibility (ICC: 0.84\u20130.98, CV and SEM: 2.9%\u201311.3%) with individual sensitivity (SDD) ranging from 11.8% to 31.2%. Systematic learning effects from test session 1\u20132 were observed for the STS test and the 3\u2010 and 10\u2010m habitual walk speed tests, manifested by increases of 6%\u20139%, 7%, and 3%, respectively (<jats:italic>p<\/jats:italic>\u2009&lt;\u20090.05). Performing a familiarization session (test 1) fully prevented these learning effects (test 2 vs. 3). A majority of physical function tests showed improved reproducibility and sensitivity after the familiarization session. In conclusion, physical function can be assessed in a reliable manner in adults with severe obesity. Further, familiarization sessions prior to actual testing result in improved test\u2013retest reliability and increased sensitivity.<\/jats:p>","DOI":"10.1111\/sms.70008","type":"journal-article","created":{"date-parts":[[2025,1,4]],"date-time":"2025-01-04T04:02:19Z","timestamp":1735963339000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Inter\u2010Session Reliability of Functional Performance and Muscle Power in Adults With Severe Obesity"],"prefix":"10.1111","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2461-2824","authenticated-orcid":false,"given":"S\u00f8ren","family":"Gam","sequence":"first","affiliation":[{"name":"Department of Diabetes and Endocrinology University Hospital of Southern Denmark  Esbjerg Denmark"},{"name":"Department of Regional Health Research University of Southern Denmark  Odense Denmark"},{"name":"Steno Diabetes Center Odense  Odense 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