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Self-selected vs. Fixed Repetition Duration: Effects on Number of Repetitions and Muscle Activation in Resistance-Trained Men.
J Strength Cond Res. 2018 Sep; 32(9):2419-2424.JS

Abstract

Nóbrega, SR, Barroso, R, Ugrinowitsch, C, da Costa, JLF, Alvarez, IF, Barcelos, C, and Libardi, CA. Self-selected vs. fixed repetition duration: effects on number of repetitions and muscle activation in resistance-trained men. J Strength Cond Res 32(9): 2419-2424, 2018-The aim of this study was to compare the effects of self-selected and fixed repetition duration (RD) on resistance exercise (RE) volume, muscle activation, and time under tension (TUT) per repetition and per session. Twelve resistance-trained men participated in the study. A randomized cross-over design was used and each participant performed 2 high-intensity RE protocols in a balanced order: (a) 3 sets of RE with self-selected RD (SELF); and (b) 3 sets of RE with fixed RD (2-second concentric and 2-second eccentric [FIX]). Muscle activation was assessed through surface electromyography (EMG) of the vastus lateralis and vastus medialis throughout RE sessions. Overall, RE volume was significantly greater for SELF (p = 0.01), whereas TUT per repetition was significantly greater for FIX (p = 0.0001). No significant differences between protocols were detected for TUT per session. Between-protocol comparisons revealed significantly greater EMG amplitude for SELF compared with FIX at S1 (p = 0.01), S2 (p = 0.03), and S3 (p = 0.03). Both SELF and FIX protocols produced significant increases in EMG amplitude from 25 to 100% (p < 0.001) of set completion. Between-protocol comparisons revealed significantly greater EMG amplitude for SELF compared with FIX at 75% (p = 0.03) and 100% (p = 0.01). In conclusion, self-selected RD resulted in greater volume and muscle activation compared with fixed RD in an RE session.

Authors+Show Affiliations

MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.Faculty of Physical Education, University of Campinas-UNICAMP, Campinas, São Paulo, Brazil.School of Physical Education and Sport, University of São Paulo-USP, São Paulo, São Paulo, Brazil.MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.

Pub Type(s)

Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

29481458

Citation

Nóbrega, Sanmy Rocha, et al. "Self-selected Vs. Fixed Repetition Duration: Effects On Number of Repetitions and Muscle Activation in Resistance-Trained Men." Journal of Strength and Conditioning Research, vol. 32, no. 9, 2018, pp. 2419-2424.
Nóbrega SR, Barroso R, Ugrinowitsch C, et al. Self-selected vs. Fixed Repetition Duration: Effects on Number of Repetitions and Muscle Activation in Resistance-Trained Men. J Strength Cond Res. 2018;32(9):2419-2424.
Nóbrega, S. R., Barroso, R., Ugrinowitsch, C., da Costa, J. L. F., Alvarez, I. F., Barcelos, C., & Libardi, C. A. (2018). Self-selected vs. Fixed Repetition Duration: Effects on Number of Repetitions and Muscle Activation in Resistance-Trained Men. Journal of Strength and Conditioning Research, 32(9), 2419-2424. https://doi.org/10.1519/JSC.0000000000002493
Nóbrega SR, et al. Self-selected Vs. Fixed Repetition Duration: Effects On Number of Repetitions and Muscle Activation in Resistance-Trained Men. J Strength Cond Res. 2018;32(9):2419-2424. PubMed PMID: 29481458.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Self-selected vs. Fixed Repetition Duration: Effects on Number of Repetitions and Muscle Activation in Resistance-Trained Men. AU - Nóbrega,Sanmy Rocha, AU - Barroso,Renato, AU - Ugrinowitsch,Carlos, AU - da Costa,Jean Lucas Fernandes, AU - Alvarez,Ieda Fernanda, AU - Barcelos,Cintia, AU - Libardi,Cleiton Augusto, PY - 2018/2/27/pubmed PY - 2018/11/6/medline PY - 2018/2/27/entrez SP - 2419 EP - 2424 JF - Journal of strength and conditioning research JO - J Strength Cond Res VL - 32 IS - 9 N2 - Nóbrega, SR, Barroso, R, Ugrinowitsch, C, da Costa, JLF, Alvarez, IF, Barcelos, C, and Libardi, CA. Self-selected vs. fixed repetition duration: effects on number of repetitions and muscle activation in resistance-trained men. J Strength Cond Res 32(9): 2419-2424, 2018-The aim of this study was to compare the effects of self-selected and fixed repetition duration (RD) on resistance exercise (RE) volume, muscle activation, and time under tension (TUT) per repetition and per session. Twelve resistance-trained men participated in the study. A randomized cross-over design was used and each participant performed 2 high-intensity RE protocols in a balanced order: (a) 3 sets of RE with self-selected RD (SELF); and (b) 3 sets of RE with fixed RD (2-second concentric and 2-second eccentric [FIX]). Muscle activation was assessed through surface electromyography (EMG) of the vastus lateralis and vastus medialis throughout RE sessions. Overall, RE volume was significantly greater for SELF (p = 0.01), whereas TUT per repetition was significantly greater for FIX (p = 0.0001). No significant differences between protocols were detected for TUT per session. Between-protocol comparisons revealed significantly greater EMG amplitude for SELF compared with FIX at S1 (p = 0.01), S2 (p = 0.03), and S3 (p = 0.03). Both SELF and FIX protocols produced significant increases in EMG amplitude from 25 to 100% (p < 0.001) of set completion. Between-protocol comparisons revealed significantly greater EMG amplitude for SELF compared with FIX at 75% (p = 0.03) and 100% (p = 0.01). In conclusion, self-selected RD resulted in greater volume and muscle activation compared with fixed RD in an RE session. SN - 1533-4287 UR - https://www.unboundmedicine.com/medline/citation/29481458/Self_selected_vs__Fixed_Repetition_Duration:_Effects_on_Number_of_Repetitions_and_Muscle_Activation_in_Resistance_Trained_Men_ L2 - http://dx.doi.org/10.1519/JSC.0000000000002493 DB - PRIME DP - Unbound Medicine ER -