Optimizing exercise for breast cancer survivors: a randomized controlled trial of daily individualization of high-intensity online concurrent training guided by autonomic modulation - Ana Myriam Lavín-Pérez; Daniel Collado-Mateo; Inés Nieto; Xián Mayo; Carmen Hinojo González; Ana de Juan Ferré; Gary Liguori; Alfonso Jiménez (BMC Sports Science, Medicine and Rehabilitation, 2026)