Differences in electromyographic activity of biceps brachii and brachioradialis while performing three variants of curl

PeerJ
Giuseppe MarcolinAntonio Paoli

Abstract

Dumbbell curl (DC) and barbell curl in its two variants, straight (BC) or undulated bar (EZ) are typical exercises to train the elbow flexors. The aim of the study was to verify if the execution of these three variants could induce a selective electromyographic (EMG) activity of the biceps brachii (BB) and brachioradialis (BR). Twelve participants performed one set of ten repetitions at 65% of their 1-RM for each variant of curl. Pre-gelled electrodes were applied with an inter-electrode distance of 24 mm on BB and BR. An electrical goniometer was synchronously recorded with EMG signals to determine the concentric and eccentric phases of each variant of curl. We detected higher activation profile of both BB (P < 0.05) and BR (P < 0.01) during the EZ compared to the DC. Higher levels of activation was found during the concentric phase for only the BR performed with an EZ compared to DC (P < 0.001) and performing BC compared to DC (P < 0.05). The eccentric phase showed a higher activation of the BB muscle in EZ compared to DC (P < 0.01) and in BC compared to DC (P < 0.05). The BR muscle showed a higher activation performing EZ compared to DC (P < 0.01). The EZ variant may be preferred over the DC variant as it enhances BB and BR ...Continue Reading

References

Jan 1, 1991·Journal of Applied Physiology·J D Howard, R M Enoka
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Jul 12, 2002·Biological cybernetics·Dario FarinaRoberto Merletti
Apr 6, 2004·Medicine and Science in Sports and Exercise·William J Kraemer, Nicholas A Ratamess
Oct 3, 2008·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·L MesinA Rainoldi
Apr 24, 2009·Journal of Strength and Conditioning Research·Anderson Souza Oliveira, Mauro Gonçalves
Jun 15, 2010·Journal of Strength and Conditioning Research·Stephen J LuskDaniel M Russell
Dec 4, 2014·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Didier Staudenmann, Wolfgang Taube
Sep 9, 2015·Journal of Strength and Conditioning Research·Cíntia E BottonRonei S Pinto
Oct 22, 2015·Journal of Athletic Training·Giuseppe MarcolinAntonio Paoli

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