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This study aimed to explore related kinematic domains in older adults with and without disability.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      A cross\u2010sectional study including adults aged 60\u2009years or older, with (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200925) and without disability (\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200935). Comparisons between groups included task time, centre of mass (CoM) acceleration, postural sway and principal component (PC) scores for each task. Principal component models (PCMs) included lower limb and trunk tridimensional joint ranges of motion, angular velocity range, CoM displacement and velocity along each Sit\u2010TS (flexion, momentum transfer, extension and stabilisation) and Stand\u2010TS (initiation, flexion, momentum transfer and extension) phases.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Older adults with functional disability exhibited increased Sit\u2010TS peak antero\u2010posterior CoM acceleration (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u2009.02). The Sit\u2010TS and Stand\u2010TS PCMs included nine PCs each. In Sit\u2010TS, the first three explained half the variance: PC1 captured transverse hip and knee stabilisation kinematics, PC2 described trunk and hip frontal and transverse control during flexion, and PC3 represented sagittal knee and ankle control during momentum transfer and extension. In Stand\u2010TS, variance was more distributed (PC1 describing frontal hip and knee flexion velocity, PC2 sagittal trunk and hip extension velocity, and PC3 vertical CoM velocity at extension). Significant group differences emerged in PC4 (transverse knee and frontal hip kinematics) and PC9 (sagittal and frontal trunk angular velocity ranges during momentum transfer).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Both transitions revealed distinct joint and trunk control demands. Principal components involving transverse knee, frontal hip and trunk angular velocities distinguished disability groups, with Stand\u2010TS showing greater discriminative power.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1111\/ajag.70089","type":"journal-article","created":{"date-parts":[[2025,9,2]],"date-time":"2025-09-02T12:36:40Z","timestamp":1756816600000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Sit\u2010to\u2010stand and stand\u2010to\u2010sit kinematics in older adults with and without functional disability: A principal component analysis"],"prefix":"10.1111","volume":"44","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0123-4960","authenticated-orcid":false,"given":"Juliana","family":"Moreira","sequence":"first","affiliation":[{"name":"CIR, E2S, Polytechnic of Porto  Porto Portugal"},{"name":"Research Center in Physical Activity, Health and Leisure, Faculty of Sports University of Porto  Porto Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bruno","family":"Cunha","sequence":"additional","affiliation":[{"name":"CINTESIS@Rise, CINTESIS.UPT Portucalense University  Porto Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jos\u00e9","family":"F\u00e9lix","sequence":"additional","affiliation":[{"name":"Department of Physiotherapy, Institute of Health of the North \u2013 Escola Superior de Sa\u00fade do Vale do Ave (ESSVA) Cooperativa de Ensino Superior Polit\u00e9cnico e Universit\u00e1rio (CESPU)  Vila Nova de Famalic\u00e3o Portugal"},{"name":"Department of Medical Sciences University of Aveiro  Aveiro Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rubim","family":"Santos","sequence":"additional","affiliation":[{"name":"CIR, E2S, Polytechnic of Porto  Porto Portugal"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9528-1463","authenticated-orcid":false,"given":"Andreia S. 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