Nonlinear, Multicomponent Physical Exercise With Heart Rate Variability-Guided Prescription in Women With Breast Cancer During Treatment: Feasibility and Preliminary Results (ATOPE Study).

"Disclosures The authors completed the ICMJE Form for Disclosure of Potential Conflicts of Interest and reported no conflicts of interest."

"Funding The study is funded by the Fondo de Investigación Sanitaria del Instituto de Salud Carlos III and the Fondos Estructurales de la Unión Europea (FEDER) (PI18/01840). Á.G.S. has received funding for its training with the grant FPU18/03575 by the Spanish Ministry of Education Cultura y Deporte. M.L.G. has received funding for its training with the grant FI19/00230 by the Fondo de Investigación Sanitaria del Instituto de Salud Carlos III. R.G.G. has received funding for its training with the grant FPU20/05674 by the Spanish Ministry of Education Cultura y Deporte. Additional funding is provided by the European Regional Development Fund (ERDF, SOMM17/6107/UGR), “Plan Propio de Investigación 2021” University of Granada (PPJIB2021–13) and the Spanish Ministry of Economy and Competitiveness (Plan Estatal de I + D + I 2013–2016)."

"This was a single-blind, prospective, 2-arm, pretest–posttest feasibility study that is part of a larger randomized controlled trial (ClinicalTrials.gov, NCT03787966). A schematic diagram of the study is presented in . This study adhered to the STROBE guidelines."