{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,28]],"date-time":"2026-04-28T04:14:29Z","timestamp":1777349669711,"version":"3.51.4"},"reference-count":64,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2021,9,13]],"date-time":"2021-09-13T00:00:00Z","timestamp":1631491200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001871","name":"Funda\u00e7\u00e3o para a Ci\u00eancia e a Tecnologia","doi-asserted-by":"publisher","award":["UIDP\/04748\/2020."],"award-info":[{"award-number":["UIDP\/04748\/2020."]}],"id":[{"id":"10.13039\/501100001871","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Healthcare"],"abstract":"<jats:p>Background: Breast cancer is the most common malignancy among women worldwide. The treatments may also cause neuromuscular and skeletal disorders; therefore, the aim of this study was to verify the existence of a relationship between heart rate variability and different functional fitness parameters in women survivors of breast cancer. Methods: This cross-sectional study included 25 women survivors of breast cancer, with a mean \u00b1 SD age, height, and body mass of 50.8 \u00b1 8.8 years, 1.6 \u00b1 0.7 m, and 67.1 \u00b1 12.3 kg, respectively. Patients underwent measurements of heart rate variability with time and frequency domain analyses, as well as a \u201c30 s chair-stand test\u201d, \u201c6 min walking test\u201d, \u201ctimed up and go test\u201d, and \u201cball throwing test\u201d. Results: A multiple linear regression analysis showed that from the heart rate variability frequency domain, high frequency explained 21% (R2 = 0.21) of the \u201c30 s chair-stand test\u201d performance. Conclusion: The findings of this study highlight high frequency as a predictor of \u201c30 s chair-stand test\u201d performance, regardless of age and time after diagnosis, suggesting its usefulness as a clinical indicator of functionality in breast cancer survivors. This study presents a straightforward and non-invasive methodology predicting functional fitness in women breast cancer survivors potentially applicable to clinical practice.<\/jats:p>","DOI":"10.3390\/healthcare9091205","type":"journal-article","created":{"date-parts":[[2021,9,13]],"date-time":"2021-09-13T21:37:12Z","timestamp":1631569032000},"page":"1205","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Relationship between Heart Rate Variability and Functional Fitness in Breast Cancer Survivors: A Cross-Sectional Study"],"prefix":"10.3390","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1524-5601","authenticated-orcid":false,"given":"Alexandre D.","family":"Martins","sequence":"first","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"CIEQV\u2014Life Quality Research Centre, Av. Dr. M\u00e1rio Soares No. 110, 2040-413 Rio Maior, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4357-4269","authenticated-orcid":false,"given":"Jo\u00e3o Paulo","family":"Brito","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"CIEQV\u2014Life Quality Research Centre, Av. Dr. M\u00e1rio Soares No. 110, 2040-413 Rio Maior, Portugal"},{"name":"CIDESD\u2014Research Centre in Sport Sciences, Health Sciences and Human Development, 5001-801 Vila Real, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6671-6229","authenticated-orcid":false,"given":"Rafael","family":"Oliveira","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"CIEQV\u2014Life Quality Research Centre, Av. Dr. M\u00e1rio Soares No. 110, 2040-413 Rio Maior, Portugal"},{"name":"CIDESD\u2014Research Centre in Sport Sciences, Health Sciences and Human Development, 5001-801 Vila Real, Portugal"}]},{"given":"Tiago","family":"Costa","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"}]},{"given":"F\u00e1tima","family":"Ramalho","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"CIPER\u2014Interdisciplinary Centre for the Study of Human Performance, Faculty of Human Kinetics (FMH), University of Lisbon, Estr. da Costa, Cruz Quebrada, Oeiras, 1495-751 Lisboa, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7188-8383","authenticated-orcid":false,"given":"Rita","family":"Santos-Rocha","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"CIPER\u2014Interdisciplinary Centre for the Study of Human Performance, Faculty of Human Kinetics (FMH), University of Lisbon, Estr. da Costa, Cruz Quebrada, Oeiras, 1495-751 Lisboa, Portugal"}]},{"given":"Nuno","family":"Pimenta","sequence":"additional","affiliation":[{"name":"Institute of Santar\u00e9m, Sports Science School of Rio Maior\u2013Polytechnic, 2140-413 Rio Maior, Portugal"},{"name":"CIPER\u2014Interdisciplinary Centre for the Study of Human Performance, Faculty of Human Kinetics (FMH), University of Lisbon, Estr. da Costa, Cruz Quebrada, Oeiras, 1495-751 Lisboa, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2021,9,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"360","DOI":"10.1016\/j.ijcard.2016.09.053","article-title":"The relationship between post-operative time and cardiac autonomic modulation in breast cancer survivors","volume":"224","author":"Palma","year":"2016","journal-title":"Int. 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