{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T08:07:07Z","timestamp":1788941227326,"version":"build-2803163510"},"reference-count":42,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T00:00:00Z","timestamp":1788912000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T00:00:00Z","timestamp":1788912000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/100014440","name":"Ministerio de Ciencia, Innovaci\u00f3n y Universidades","doi-asserted-by":"publisher","award":["PID2020\u2010118262RB\u2010I00"],"award-info":[{"award-number":["PID2020\u2010118262RB\u2010I00"]}],"id":[{"id":"10.13039\/100014440","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100020230","name":"Consejer\u00eda de Transformaci\u00f3n Econ\u00f3mica, Industria, Conocimiento y Universidades","doi-asserted-by":"publisher","award":["POSTDOC_21_00059"],"award-info":[{"award-number":["POSTDOC_21_00059"]}],"id":[{"id":"10.13039\/100020230","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Physiotherapy Res Intl"],"published-print":{"date-parts":[[2026,10]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Background and Purpose<\/jats:title>\n                    <jats:p>Individuals with Severe Mental Disorders (SMDs) face a high risk of premature mortality and disability due to accelerated neuromuscular decline. Despite the critical need to monitor physical function, the lack of validated, time\u2010efficient tools limits their clinical utility and hinders the integration of objective assessments into routine care. This gap limits the early identification of physical function impairments and the implementation of timely evidence\u2010based interventions. This is the first study to evaluate the criterion validity of the 30\u2010s Chair Stand Test (30s\u2010CST) as a pragmatic indicator of lower\u2010limb muscle strength in adults with SMDs, providing a feasible functional indicator to support routine clinical assessment.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Using a cross\u2010sectional validation design (STROBE), this study was conducted with 91 adults (18\u201365\u00a0years) diagnosed with SMDs. Participants performed the 30s\u2010CST and reference isometric Knee Extension Strength (KES) testing. Statistical analyses included Pearson's correlation (\n                      <jats:italic>r<\/jats:italic>\n                      ), Intraclass Correlation Coefficients (\n                      <jats:italic>ICC<\/jats:italic>\n                      ), and Bland\u2013Altman plots to determine agreement and heteroscedasticity, with sub\u2010analyses by sex, age, and body mass index.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Analysis revealed significant moderate correlation and agreement (\n                      <jats:italic>r<\/jats:italic>\n                      \u00a0=\u00a00.56 [95% CI 0.40\u20130.69]; ICC\u00a0=\u00a00.54 [0.38\u20130.67]; both\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0&lt;\u00a00.001) for the total sample, with stronger results in the female subgroup. The 30s\u2010CST demonstrated precision, with a prediction error lower than the within\u2010subject variability of the reference method. Bland\u2013Altman plots showed acceptable agreement, with narrow limits of agreement (\u22121.79\u20131.80), and analysis indicated homoscedasticity.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Discussion<\/jats:title>\n                    <jats:p>The 30s\u2010CST appears to be a pragmatic and time\u2010efficient screening tool for identifying individuals with reduced lower\u2010limb muscle strength in SMDs. Although limited by the lack of biomechanical specificity between dynamic and isometric methods, the test offers a balance between clinical feasibility and its ability to provide a functional estimate related to lower\u2010limb muscle strength. Integrating this pragmatic screening tool into routine practice may support the assessment of functional performance in resource\u2010constrained settings where more complex strength assessments are not readily available.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/pri.70344","type":"journal-article","created":{"date-parts":[[2026,9,9]],"date-time":"2026-09-09T07:41:41Z","timestamp":1788939701000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Criterion Validity of the 30\u2010Second Chair Stand Test for Lower\u2010Limb Muscle Strength in Adults With Severe Mental Disorders: The PsychiActive Project"],"prefix":"10.1002","volume":"31","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0862-8655","authenticated-orcid":false,"given":"Alvaro","family":"Lopez\u2010Moral","sequence":"first","affiliation":[{"name":"Physical Performance &amp; Sports Research Center (CIRFD), Department of Sports and Computer Science, Section of Physical Education and Sports, Faculty of Sports Sciences Universidad Pablo de Olavide  Seville Spain"},{"name":"Department of Physical Education and Sport Universidad de Sevilla  Seville Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7817-747X","authenticated-orcid":false,"given":"Diego","family":"Munguia\u2010Izquierdo","sequence":"additional","affiliation":[{"name":"Physical Performance &amp; Sports Research Center (CIRFD), Department of Sports and Computer Science, Section of Physical Education and Sports, Faculty of Sports Sciences Universidad Pablo de Olavide  Seville Spain"},{"name":"Research Group in Development Movimiento Humano Universidad de Zaragoza  Zaragoza Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8063-3980","authenticated-orcid":false,"given":"Javier","family":"Bueno\u2010Antequera","sequence":"additional","affiliation":[{"name":"Physical Performance &amp; Sports Research Center (CIRFD), Department of Sports and Computer Science, Section of Physical Education and Sports, Faculty of Sports Sciences Universidad Pablo de Olavide  Seville Spain"},{"name":"Research Group in Development Movimiento Humano Universidad de Zaragoza  Zaragoza Spain"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,9,9]]},"reference":[{"key":"e_1_2_14_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/jcsm.12737"},{"key":"e_1_2_14_3_1","volume-title":"Practical Statistics for Medical Research","author":"Altman D. 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