Does Eccentric-Only and Concentric-Only Activation Increase Power Output?


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Abstract

PurposeThe aim of study was to evaluate changes in power output and bar velocity in the bench press throw (BPT) following the bench press exercise as a conditioning activity (CA) with concentric only (CONONLY) and eccentric only (ECCONLY) contractions.MethodsThirty-two (n=32) healthy strength-trained men participated in this study (age: 28.4±4.5 years; height: 177±7.6 cm; body mass: 93.5±9.3 kg; BP-1RM: 143.6±17.5 kg). The experiment was performed following a randomized crossover design, where each participant performed 2 sets of 2 repetitions using the bench press exercise as the CA at 90%1RM ECCONLY, 90%1RM CONONLY, 110%1RM ECCONLY or 130%1RM ECCONLY contraction. The BPT was performed to assess changes in peak, mean power (PP; MP) and peak, mean velocity (PV; MV) before and after CA. The differences between analyzed variables before and after the CA were verified using ANOVA with repeated measures. Statistical significance was set at p<0.05.ResultsThere were statistically significant differences between baseline and post-activation value of PP and PV in the BPT (p<0.05) after the CA with ECCONLY contraction at 110%1RM and at 130%1RM as well between baseline and post-activation value of MV in the BPT (p<0.05) after CA with contraction at 110%1RM. There were no significant differences between baseline and post-activation values of PP, MP, PV and MV in the BPT after the CA with CONONLY contraction at 90%1RM and CA with ECCONLY contraction at 90%1RM.ConclusionPartial movement with ECCONLY contraction is effective in short-term power output development, but only when the load used in the CA exceeds 100%1RM.

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