Self-selected vs. fixed repetition duration : effects on number of repetitions and muscle activation in resistance-trained men

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Deutscher übersetzter Titel:Selbst ausgewählte im Vergleich zu fest vorgegebener Wiederholungsdauer : die Auswirkung auf die Anzahl der Wiederholungen und die Muskelaktivierung krafttrainierter Männer
Autor:Nóbrega, Sanmy Rocha; Barroso, Renato; Ugrinowitsch, Carlos; Costa, Jean Lucas Fernandes da; Alvarez, Ieda Fernanda; Barcelos, Cintia; Libardi, Cleiton Augusto
Erschienen in:Journal of strength and conditioning research
Veröffentlicht:32 (2018), 9, S. 2419-2424, Lit.
Format: Literatur (SPOLIT)
Publikationstyp: Zeitschriftenartikel
Medienart: Elektronische Ressource (online) Gedruckte Ressource
Sprache:Englisch
ISSN:1064-8011, 1533-4287
DOI:10.1519/JSC.0000000000002493
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Erfassungsnummer:PU201809006790
Quelle:BISp

Abstract des Autors

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.