{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,28]],"date-time":"2026-09-28T17:56:18Z","timestamp":1790618178487,"version":"4.1.0"},"reference-count":47,"publisher":"Wiley","issue":"9","license":[{"start":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T00:00:00Z","timestamp":1790294400000},"content-version":"vor","delay-in-days":24,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"},{"start":{"date-parts":[[2026,9,1]],"date-time":"2026-09-01T00:00:00Z","timestamp":1788220800000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"funder":[{"DOI":"10.13039\/100000054","name":"National Cancer Institute","doi-asserted-by":"publisher","award":["R01 CA242745"],"award-info":[{"award-number":["R01 CA242745"]}],"id":[{"id":"10.13039\/100000054","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Psycho-Oncology"],"published-print":{"date-parts":[[2026,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Objective<\/jats:title>\n                    <jats:p>Theory\u2010based physical activity (PA) interventions improve moderate to vigorous physical activity (MVPA) among breast cancer survivors, yet limited research has examined when psychosocial changes occur during intervention delivery. Understanding temporal changes in theoretical constructs during PA adoption may enhance intervention delivery and outcomes. The purpose of this study is to examine longitudinal changes in self\u2010efficacy, self\u2010regulation and affect (intrapersonal constructs from Social Cognitive Theory) and social support (interpersonal construct) during a 12\u2010week theory\u2010based PA program (webMFT) and their association with participants' active minutes (measured by Fitbit) over 12\u00a0weeks and intervention engagement (receipt of 12 weekly peer coaching calls).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>In a randomized controlled trial with 61 participants, 30 were randomized to receive webMFT (mean age\u00a0=\u00a058.1 [SD\u00a0=\u00a08.55], 1.40\u00a0years post\u2010diagnosis [SD\u00a0=\u00a00.5], 80% Stage 0\u20131 cancer, 80% White) delivered by 10 peer coaches. Only the webMFT participants were assessed; the comparison group (MVPA Tracking) was not included in the analyses. webMFT participants received a Fitbit tracker and weekly PA coaching calls tailored to Fitbit PA data. At baseline, 4, 8 and 12\u00a0weeks, they completed questionnaires assessing multidimensional self\u2010efficacy (task, coping, scheduling), self\u2010regulation skills, affective response and social support for PA. Mixed effects regression models examined changes in constructs and their association with Fitbit active minutes\/week and intervention engagement.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Increases in total self\u2010efficacy, scheduling self\u2010efficacy, positive affect and social support from family and friends were significantly associated with participants' PA over 12\u00a0weeks. There were no significant associations between changes in self\u2010regulation skills, task or coping self\u2010efficacy with PA. Improvements in total self\u2010efficacy, scheduling self\u2010efficacy, self\u2010regulation, affective response and family social support were positively associated with intervention engagement.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Participants' self\u2010efficacy, specifically, for scheduling PA, positive affect and social support for PA adoption and intervention engagement merit future examination.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/pon.70616","type":"journal-article","created":{"date-parts":[[2026,9,25]],"date-time":"2026-09-25T11:59:51Z","timestamp":1790337591000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Making Interventions More Effective: Changes in Theoretical Constructs During Delivery of a Peer\u2010Led Physical Activity Program for Breast Cancer Survivors"],"prefix":"10.1002","volume":"35","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7324-9339","authenticated-orcid":false,"given":"Bernardine M.","family":"Pinto","sequence":"first","affiliation":[{"name":"College of Nursing University of South Carolina  Columbia South Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4383-553X","authenticated-orcid":false,"given":"Madison","family":"Kindred","sequence":"additional","affiliation":[{"name":"Department of Kinesiology Augusta University  Augusta Georgia USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7649-4137","authenticated-orcid":false,"given":"Victoria R.","family":"DeScenza","sequence":"additional","affiliation":[{"name":"University of Connecticut  Storrs Connecticut USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5636-0601","authenticated-orcid":false,"given":"Shira","family":"Dunsiger","sequence":"additional","affiliation":[{"name":"School of Public Health Brown University  Providence Rhode Island 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