Muscle activation during power-oriented resistance training: Continuous vs. cluster set configurations Morales Artacho, Antonio Jesús García Ramos, Amador Pérez Castilla, Alejandro Padial Puche, Paulino Gómez García, Ángel Manuel Peinado Herreros, Antonio Miguel Pérez Córdoba, José Luis Feriche Fernández-Castanys, María Belén countermovement jump power training resistance training muscle fatigue This work was supported by the Spanish Ministry of Science and Education under Grant [FPU 13/04801]; Spanish Ministry of Science and Innovation under Grant (DEP2015-64350-P- MINECO/FEDER). This study is part of a PhD Thesis conducted in the Biomedicine Doctoral Studies of the University of Granada, Spain. This study examined performance and electromyography (EMG) changes during a power training protocol comprising continuous or clustered set configurations. Eighteen active males completed 6 sets of 6 repetitions during the loaded (20% 1 repetition maximum) countermovement jump (CMJ) exercise, continuously (n = 9) or with a 30-second pause every 2 repetitions (cluster; n = 9). Power output, vastus lateralis (VL), vastus medialis (VM), and rectus femoris (RF) EMG were recorded during all CMJs. Relative changes from the first repetition were assessed on the EMG root mean square (RMS), median frequency (Fmed), and a low- to high-frequency ratio index of fatigue (FInsmk). Greater power output decrements were observed during the continuous set configuration (p = 0.001, h2 G , 0.01). Greater RMS increments in VL (6.8 6 11.3 vs. 21.7 6 5.8%) and RF (9.3 6 14.2 vs. 1.9 6 6.9%), but not VM (2.0 6 4.7 vs. 2.6 6 7.3%), were also observed in the continuous compared with the cluster sets (p = 0.033, h2 G = 0.06). Progressive decrements in Fmed and increments in FInsmk were observed across repetitions in both set configurations. In conclusion, although clustering sets between repetitions clearly maintained power output, mixed responses were observed on the examined EMG parameters. 2024-11-04T07:55:29Z 2024-11-04T07:55:29Z 2019-07 journal article Published version: Morales Artacho, Antonio J. et al. Muscle activation during power-oriented resistance training: continuous vs. cluster set configurations. J Strength Cond Res 33(7S): S95–S102, 2019. doi:10.1519/JSC.0000000000002811 https://hdl.handle.net/10481/96571 10.1519/JSC.0000000000002811 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Lippincott