RT Journal Article T1 Acute and delayed effects of a resistance training session leading to muscular failure on mechanical, metabolic, and perceptual responses A1 Párraga Montilla, Juan A A1 García Ramos, Amador A1 Castaño Zambudio, Adrián A1 Capelo Ramírez, Fernando A1 González Hernández, Jorge M A1 Cordero Rodríguez, Yaiza Adela A1 Jiménez Reyes, Pedro A2 National Strength and Conditioning Research, AB Párraga-Montilla, JA, García-Ramos, A, Castaño-Zambudio, A, Capelo-Ramírez, F, González-Hernández, JM, Cordero-Rodríguez, Y, and Jiménez-Reyes, P. Acute and delayed effects of a resistance training session leading to muscular failure on mechanical, metabolic, and perceptual responses. J Strength Cond Res 34(8): 2220-2226, 2020-This study explored the acute and delayed (24 and 48 hours after exercise) effects of a resistance training session leading to muscular failure. Eleven resistance-trained men completed a training session consisting on 3 sets of repetitions to failure during the back-squat exercise performed at the maximum possible speed with a load equivalent to a mean propulsive velocity (MPV) of 1 m·s (≈60% of 1 repetition maximum). A number of mechanical (number of repetitions and starting MPV of the set, MPV achieved against the 1MPV load, countermovement jump [CMJ] height, and handgrip strength), metabolic (lactate, uric acid, and ammonia concentrations), and perceptual (OMNI-RES perceived exertion) variables were measured. The results revealed (a) a decrease of 38.7% in set 2 and 54.7% in set 3 of the number of repetitions performed compared with the first set (p < 0.05), (b) a reduction in the MPV of the repetitions and an increase in lactate concentration and OMNI-RES values with the succession of sets (p < 0.05), (c) comparable decrements in CMJ height after the 3 sets (25-32%), (d) a decrease in CMJ height (p < 0.05; 6.7-7.9%) and in the MPV attained against the 1MPV load (p < 0.05; 13-14%) after 24 and 48 hours of completing the training session, but no significant changes were observed in handgrip strength (p > 0.05; <2%), and (e) uric acid and ammonia concentrations above the basal levels (p < 0.05). The large decrements in mechanical performance together with the high metabolic stress discourage the frequent use of resistance training sessions leading to muscular failure PB National Strength and Conditioning Association SN 1064-8011 YR 2018 FD 2018 LK https://hdl.handle.net/20.500.14352/99389 UL https://hdl.handle.net/20.500.14352/99389 LA eng NO Párraga-Montilla, J. A., García-Ramos, A., Castaño-Zambudio, A., Capelo-Ramírez, F., González-Hernández, J. M., Cordero-Rodríguez, Y., & Jiménez-Reyes, P. (2020). Acute and Delayed Effects of a Resistance Training Session Leading to Muscular Failure on Mechanical, Metabolic, and Perceptual Responses. Journal of strength and conditioning research, 34(8), 2220-2226. https://doi.org/10.1519/JSC.0000000000002712 DS Docta Complutense RD 10 abr 2025