RT Journal Article T1 Muscle mechanical response to exercise with active vs. passive rest A1 Bueno Russo, Rodrigo A1 Velázquez Saornil, Jorge A1 Díaz Ureña, Germán A1 Sánchez Milá, Zacarías A1 Frutos Llanes, Raúl A1 Barragán Casas, José Manuel A1 Rodríguez Sanz, David AB Introductionthe muscular response on the main muscles of the propulsive phase of the upper limb in the crawl swimming style has been evaluated by means of tensiomyography (TMG), which was carried out through three parameters: activation time (Td), contraction time (Tc) and maximum deformation (Dm).The aim of this study is to evaluate the hypothesis of changes produced between lactic resistance training with passive rest and lactic resistance training with active rest.Material and methodsexperimental study with ninety swimmers in the crawl stroke, with a mean age of 20 years. The session with passive recovery and the session with active recovery presented results with significant changes after the development of each of them in the Tc in the three muscles analysed, being in the Pectoralis Major (PM), p = 0.001, in the Latissimus Dorsi (LD), p = 0.01 and in the Tríceps Brachii (TB), p = 0.047.ConclusionAccording to the results it can be deduced that lactic resistance training with passive rest and with active rest do not influence the muscle response if we compare both trainings. Only one of the Tc values changes, while the latissimus dorsi muscle also shows changes in Td. PB Elsevier España, S.L.U. SN 2666-5069 YR 2024 FD 2024-05-01 LK https://hdl.handle.net/20.500.14352/124480 UL https://hdl.handle.net/20.500.14352/124480 LA eng NO Bueno Russo R, Velázquez Saornil J, Díaz Ureña G, Sánchez Milá Z, Frutos-Llanes R, Barragán Casas JM, et al. Muscle mechanical response to exercise with active vs. passive rest. Apunts: Medicina de l’esport. 2024;59(222). DS Docta Complutense RD 18 dic 2025