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Participants were allocated to bodyweight interval training (BWIT\u2009=\u200930) for 24 weeks or to a control group (CG\u2009=\u200930) instructed to maintain their usual physical activities. Frailty status (Fried phenotype), physical-functional performance, cardiohemodynamic responses, and body composition were assessed at baseline and after 12 and 24 weeks. Longitudinal effects were analyzed using linear mixed-effects models and categorical between-group comparisons.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>BWIT was associated with a higher probability of transition to less frail states over 24 weeks (p\u2009&lt;\u20090.001), whereas the control group remained stable. Significant effects were observed in the intervention group (OR\u2009=\u200915.44; p\u2009=\u20090.006) and over time at 12 weeks (OR\u2009=\u20094.96; p\u2009=\u20090.005) and 24 weeks (OR\u2009=\u200915.24; p\u2009&lt;\u20090.001). BWIT improved knee extension strength, five-times sit-to-stand performance, gait speed, and reduced blood pressure parameters (p\u2009&lt;\u20090.001), with no relevant changes in body composition.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>BWIT was effective in modifying frailty status in older adults over 24 weeks and may represent a feasible and accessible strategy for frailty management in primary health care.<\/jats:p>\n                    <jats:p>Trial registration: RBR-23t5jbh (Brazilian Registry of Clinical Trials), registered September 4, 2024, retrospectively registered.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s41999-026-01579-8","type":"journal-article","created":{"date-parts":[[2026,8,12]],"date-time":"2026-08-12T09:32:01Z","timestamp":1786527121000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Effect of bodyweight interval training on frailty status in older adults: a randomized controlled trial"],"prefix":"10.1007","author":[{"ORCID":"https:\/\/orcid.org\/0009-0001-7010-1224","authenticated-orcid":false,"given":"Lucas Marques","family":"Vieira","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3993-8277","authenticated-orcid":false,"given":"Danilo Sales","family":"Bocalini","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7598-3775","authenticated-orcid":false,"given":"Clarcson Pl\u00e1cido Concei\u00e7\u00e3o","family":"dos Santos","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9559-9770","authenticated-orcid":false,"given":"Leandro Brasil","family":"Rego","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8568-3346","authenticated-orcid":false,"given":"Rodrigo","family":"Villar","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8069-2366","authenticated-orcid":false,"given":"Aylton Jos\u00e9 Figueira","family":"J\u00fanior","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-2910-469X","authenticated-orcid":false,"given":"Rodrigo Chaves","family":"da Silva","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0003-8115-8749","authenticated-orcid":false,"given":"Ana Paula","family":"de Souza Lima","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-8670-0946","authenticated-orcid":false,"given":"Ruy Barbosa Martins Calheiros","family":"Netto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-9773-7570","authenticated-orcid":false,"given":"Fel\u00edcio Savioli","family":"Neto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0008-0048-8671","authenticated-orcid":false,"given":"Taina Costa","family":"Nonato","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-8870-5150","authenticated-orcid":false,"given":"Jo\u00e3o Paulo","family":"Pinto","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8358-0260","authenticated-orcid":false,"given":"Francisco Luciano Pontes","family":"J\u00fanior","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2026,8,12]]},"reference":[{"key":"1579_CR1","doi-asserted-by":"publisher","first-page":"125","DOI":"10.1007\/s40520-025-03021-8","volume":"37","author":"V Gianfredi","year":"2025","unstructured":"Gianfredi V, Nucci D, Pennisi F, Maggi S, Veronese N, Soysal P (2025) Aging, longevity, and healthy aging: the public health approach. 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