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STS capacity was assessed with an instrumented five-times STS test. Free-living STS transitions were monitored in 2-hour intervals over four days using an accelerometer. Associations were examined using Wilcoxon rank-sum test and logistic regression analyses.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      In total, 47% had ADL\/IADL difficulties, 26% reported walking difficulties, and 17% had difficulties negotiating stairs. Participants with any difficulties performed STS transitions at a higher proportion of their STS capacity compared to those without difficulties (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05). Higher relative free-living STS thigh angular velocity was associated with walking and stair negotiation difficulties in both crude (OR 1.23\u20131.53;\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05) and adjusted models (OR 1.20\u20131.40;\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.05), while the association with ADL\/IADL difficulties weakened after adjustment.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Our findings suggest that performing STS transitions at high intensity may reflect emerging mobility difficulties.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s40520-026-03352-0","type":"journal-article","created":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T18:34:54Z","timestamp":1772130894000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Association between relative free-living sit-to-stand transition thigh angular velocities and difficulties in mobility and daily functioning"],"prefix":"10.1007","volume":"38","author":[{"given":"Antti","family":"L\u00f6pp\u00f6nen","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kaisa","family":"Koivunen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Taina","family":"Rantanen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura","family":"Karavirta","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Timo","family":"Rantalainen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,2,26]]},"reference":[{"key":"3352_CR1","doi-asserted-by":"publisher","first-page":"1429","DOI":"10.1111\/j.1532-5415.1996.tb04066.x","volume":"44","author":"JD Williamson","year":"1996","unstructured":"Williamson JD, Fried LP (1996) Characterization of older adults who attribute functional decrements to old age. 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