Produção Nacional
Revisado por pares
Longer Concentric Action Increases Muscle Activation and Neuromuscular Fatigue Responses in Protocols Equalized by Repetition Duration
2017; Lippincott Williams & Wilkins; Volume: 33; Issue: 6 Linguagem: Inglês
10.1519/jsc.0000000000002148
ISSN1533-4287
AutoresLucas Túlio de Lacerda, Cinara Gonçalves Costa, Fernando Vítor Lima, Hugo César Martins-Costa, Rodrigo César Ribeiro Diniz, André Gustavo Pereira de Andrade, Gustavo H. C. Peixoto, Michael G. Bemben, Mauro Heleno Chagas,
Tópico(s)Cardiovascular and exercise physiology
ResumoAbstract Lacerda, LT, Costa, CG, Lima, FV, Martins-Costa, HC, Diniz, RCR, Andrade, AGP, Peixoto, GHC, Bemben, MG, and Chagas, MH. Longer concentric action increases muscle activation and neuromuscular fatigue responses in protocols equalized by repetition duration. J Strength Cond Res 33(6): 1629–1639, 2019—The aim of this study was to investigate the impact of protocols equalized by the repetition duration but composed of different concentric (CON) and eccentric (ECC) durations on muscle activation and neuromuscular fatigue. Seventeen males with previous experience in resistance training performed 3 training protocols (A — 2 second CON: 4 second ECC; B — 3 second CON: 3 second ECC; and C — 4 second CON: 2 second ECC) with the Smith machine bench press exercise, all with 3 sets, 6 repetitions, 3 minutes' rest, and 60% of 1RM. The normalized root mean square of the electromyographic signal (EMG RMS ) and mean frequency electromyography (EMG MF ) for pectoralis major and triceps brachii muscles were calculated for second and fifth repetitions in each set. The results showed an EMG MF decrease across the repetitions accompanied by a progressive increase of the EMG RMS across the repetitions for all protocols and muscles. The EMG RMS was higher in protocol C when compared with protocol A and B for pectoralis major. The EMG MF was lower in protocols B and C than in protocol A for pectoralis major throughout the sets and repetitions. A higher EMG RMS and a lower EMG MF were observed in protocols B and C compared with protocol A for triceps brachii, solely in the fifth repetition. In conclusion, training protocols conducted with the same repetition duration, but with different concentric and eccentric durations, produce distinct muscle activation and neuromuscular fatigue responses, in which performing longer concentric durations could be the more appropriate strategy to increase muscle activation and neuromuscular fatigue.
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