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This study examined how the composition of 24\u2010h movement behaviors changes during these life transitions. Young adults (<jats:italic>n<\/jats:italic>\u2009=\u2009170, mean age 25.6\u2009years, SD 0.6) from the Special Turku Coronary Risk Factor Intervention Project (STRIP) wore wrist\u2010worn accelerometers for 1\u2009week and completed questionnaire at ages 26 and 31\u2009years. Participants were categorized by relationship status into single (16%), those transitioning from single to partnered (31%), partnered (47%), and separated (7%), and by parenthood status into non\u2010parents (73%), new parents (19%), and parents (8%). Changes in daily movement behaviors, including sleep, sedentary behavior (SED), light physical activity (LPA), and moderate\u2010to\u2010vigorous physical activity (MVPA), were examined using compositional linear mixed models. In general, LPA and MVPA decreased relative to sleep and SED (<jats:italic>p<\/jats:italic>\u2009=\u20090.007). Differences emerged between LPA and MVPA in relationship and parenthood groups (<jats:italic>p<\/jats:italic> for group\u2009\u00d7\u2009time interaction 0.008 and 0.001). Those transitioning to partnership decreased MVPA by 17\u2009min\/day, while partnered and separated individuals showed no notable MVPA change but decreased LPA by 14 and 43\u2009min\/day. Single individuals and non\u2010parents decreased LPA and MVPA in similar proportions. New parents decreased MVPA by 20\u2009min\/day, while parents increased it by 19\u2009min\/day. Becoming first\u2010time parent and starting relationship was associated with decline of MVPA. Our results suggest the importance of considering these life transitions and providing guidance for maintaining physical activity despite changes in life situations.<\/jats:p>","DOI":"10.1111\/sms.14751","type":"journal-article","created":{"date-parts":[[2024,10,29]],"date-time":"2024-10-29T05:02:07Z","timestamp":1730178127000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Changes in 24\u2010h Movement Behaviors During Relationship and Parenthood Transitions: A Compositional Data Analysis"],"prefix":"10.1111","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3520-8069","authenticated-orcid":false,"given":"Kristin","family":"Suorsa","sequence":"first","affiliation":[{"name":"Department of Public Health University of Turku and Turku University Hospital  Turku Finland"},{"name":"Centre for Population Health Research University of Turku and Turku University Hospital  Turku Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Milja","family":"Lindstedt","sequence":"additional","affiliation":[{"name":"Department of Public Health University of Turku and Turku University Hospital  Turku Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Charlotte\u00a0Lund","family":"Rasmussen","sequence":"additional","affiliation":[{"name":"School of Allied Health Curtin University  Perth Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7499-6128","authenticated-orcid":false,"given":"Tuija","family":"Leskinen","sequence":"additional","affiliation":[{"name":"Department of Public Health University of Turku and Turku University Hospital  Turku Finland"},{"name":"Centre for Population Health Research University of Turku and Turku University Hospital  Turku Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jesse","family":"Pasanen","sequence":"additional","affiliation":[{"name":"Department of Public Health University of Turku and Turku University Hospital  Turku Finland"},{"name":"Centre for Population Health Research University of Turku and Turku University Hospital  Turku Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Suvi","family":"Rovio","sequence":"additional","affiliation":[{"name":"Centre for Population Health Research University of Turku and Turku University Hospital  Turku Finland"},{"name":"Research Centre of Applied and Preventive Cardiovascular Medicine University of Turku  Turku Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1722-1729","authenticated-orcid":false,"given":"Olli\u00a0J.","family":"Heinonen","sequence":"additional","affiliation":[{"name":"Paavo Nurmi Centre &amp; 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