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Longer Concentric Action Increases Muscle Activation and Neuromuscular Fatigue Responses in Protocols Equalized by Repetition Duration.
J Strength Cond Res. 2019 Jun; 33(6):1629-1639.JS

Abstract

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 (EMGRMS) and mean frequency electromyography (EMGMF) for pectoralis major and triceps brachii muscles were calculated for second and fifth repetitions in each set. The results showed an EMGMF decrease across the repetitions accompanied by a progressive increase of the EMGRMS across the repetitions for all protocols and muscles. The EMGRMS was higher in protocol C when compared with protocol A and B for pectoralis major. The EMGMF was lower in protocols B and C than in protocol A for pectoralis major throughout the sets and repetitions. A higher EMGRMS and a lower EMGMF 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.

Authors+Show Affiliations

Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais. Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais.Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais.Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais.Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais. Pontifical Catholic University of Minas Gerais, Belo Horizonte, Minas Gerais.Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais.Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais.Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais.Department of Health and Exercise Science University of Oklahoma, Norman, Oklahoma.Weight Training Laboratory, School of Physical Education, Physiotherapy and Occupational Therapy, Federal University of Minas Gerais, Belo Horizonte, Minas Gerais.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28737588

Citation

Lacerda, Lucas T., et al. "Longer Concentric Action Increases Muscle Activation and Neuromuscular Fatigue Responses in Protocols Equalized By Repetition Duration." Journal of Strength and Conditioning Research, vol. 33, no. 6, 2019, pp. 1629-1639.
Lacerda LT, Costa CG, Lima FV, et al. Longer Concentric Action Increases Muscle Activation and Neuromuscular Fatigue Responses in Protocols Equalized by Repetition Duration. J Strength Cond Res. 2019;33(6):1629-1639.
Lacerda, L. T., Costa, C. G., Lima, F. V., Martins-Costa, H. C., Diniz, R. C. R., Andrade, A. G. P., Peixoto, G. H. C., Bemben, M. G., & Chagas, M. H. (2019). Longer Concentric Action Increases Muscle Activation and Neuromuscular Fatigue Responses in Protocols Equalized by Repetition Duration. Journal of Strength and Conditioning Research, 33(6), 1629-1639. https://doi.org/10.1519/JSC.0000000000002148
Lacerda LT, et al. Longer Concentric Action Increases Muscle Activation and Neuromuscular Fatigue Responses in Protocols Equalized By Repetition Duration. J Strength Cond Res. 2019;33(6):1629-1639. PubMed PMID: 28737588.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Longer Concentric Action Increases Muscle Activation and Neuromuscular Fatigue Responses in Protocols Equalized by Repetition Duration. AU - Lacerda,Lucas T, AU - Costa,Cinara G, AU - Lima,Fernando V, AU - Martins-Costa,Hugo C, AU - Diniz,Rodrigo C R, AU - Andrade,André G P, AU - Peixoto,Gustavo H C, AU - Bemben,Michael G, AU - Chagas,Mauro H, PY - 2017/7/25/pubmed PY - 2019/8/9/medline PY - 2017/7/25/entrez SP - 1629 EP - 1639 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 33 IS - 6 N2 - 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 (EMGRMS) and mean frequency electromyography (EMGMF) for pectoralis major and triceps brachii muscles were calculated for second and fifth repetitions in each set. The results showed an EMGMF decrease across the repetitions accompanied by a progressive increase of the EMGRMS across the repetitions for all protocols and muscles. The EMGRMS was higher in protocol C when compared with protocol A and B for pectoralis major. The EMGMF was lower in protocols B and C than in protocol A for pectoralis major throughout the sets and repetitions. A higher EMGRMS and a lower EMGMF 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. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/28737588/Longer_Concentric_Action_Increases_Muscle_Activation_and_Neuromuscular_Fatigue_Responses_in_Protocols_Equalized_by_Repetition_Duration_ L2 - http://dx.doi.org/10.1519/JSC.0000000000002148 DB - PRIME DP - Unbound Medicine ER -