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Self-selected vs. Fixed Repetition Duration: Effects on Number of Repetitions and Muscle Activation in Resistance-Trained Men.
Nóbrega, Sanmy Rocha; Barroso, Renato; Ugrinowitsch, Carlos; da Costa, Jean Lucas Fernandes; Alvarez, Ieda Fernanda; Barcelos, Cintia; Libardi, Cleiton Augusto.
Afiliación
  • Nóbrega SR; MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.
  • Barroso R; Faculty of Physical Education, University of Campinas-UNICAMP, Campinas, São Paulo, Brazil.
  • Ugrinowitsch C; School of Physical Education and Sport, University of São Paulo-USP, São Paulo, São Paulo, Brazil.
  • da Costa JLF; MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.
  • Alvarez IF; MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.
  • Barcelos C; MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.
  • Libardi CA; MUSCULAB-Laboratory of Neuromuscular Adaptations to Resistance Training, Department of Physical Education, Federal University of São Carlos-UFSCar, São Carlos, São Paulo, Brazil.
J Strength Cond Res ; 32(9): 2419-2424, 2018 Sep.
Article en En | MEDLINE | ID: mdl-29481458
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.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Músculo Cuádriceps / Fuerza Muscular / Entrenamiento de Fuerza Tipo de estudio: Clinical_trials Límite: Adolescent / Adult / Humans / Male Idioma: En Revista: J Strength Cond Res Asunto de la revista: FISIOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Estados Unidos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Músculo Cuádriceps / Fuerza Muscular / Entrenamiento de Fuerza Tipo de estudio: Clinical_trials Límite: Adolescent / Adult / Humans / Male Idioma: En Revista: J Strength Cond Res Asunto de la revista: FISIOLOGIA Año: 2018 Tipo del documento: Article País de afiliación: Brasil Pais de publicación: Estados Unidos