Effects of pre-exhaustion on the patterns of muscular activity in the flat bench press.
Pre-exhaustion (PE) has been applied in resistance training to manipulate the order of performing two resistance exercises, a single joint exercise to momentary exhaustion, followed by a multi-joint movement which includes the same muscle group. This method ensures greater recruitment of muscles or muscle groups in the multi-joint exercise to further increase muscle strength and overcome strength plateaus. The purpose of the present study was to investigate muscle activity by electromyography during high-intensity (95% of 1 repetition maximum) bench press (BP), before and after PE of the pectoralis major (PM), anterior deltoid (AD) and triceps brachii (TB) muscles in order to determine the effects of PE of the prime movers. Eight healthy athletes, experienced in resistance training, participated in the study. There were four sessions of the experiment. Session 1 was aimed at determination of one repetition maximum during a flat BP. Session 2, 3 and 4 consisted of performing a BP after PE of the muscles studied by the incline dumbbell fly, front deltoid raise, and lying triceps extension exercise. Peak concentric TB activation following TB PE (mean +/- SD, 147.76 +/- 18.6%) was significantly greater by ANOVA ([eta]2=0.82, F=5.45, p=0.004) compared to peak TB activation (114.77 +/- 19.4%) before TB PE. The statistical analysis for PM and AD did not show any significant differences. Coaches should not expect the usefulness of PE protocol to elicit higher PM or AD activity or fatigue, but they can use it to increase TB activity before high intensity BP exercise.
Copyright (C) 2016 by the National Strength & Conditioning Association.
Autor / Fonte:Go?a? Artur, Maszczyk Adam, Pietraszewski Przemyslaw, Petr Stastny, Tufano James, Zaj?c Adam Journal of Strength and Conditioning Research 2016 November 29