The Effects of Varying Glenohumeral Joint Angle on Acute Volume Load, Muscle Activation, Swelling, and Echo-Intensity on the Biceps Brachii in Resistance-Trained Individuals

Barakat, Christopher; Barroso, Renato; Alvarez, Michael; Rauch, Jacob; Miller, Nicholas; Bou-Sliman, Anton; De Souza, Eduardo O.

doi:10.3390/sports7090204

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The Effects of Varying Glenohumeral Joint Angle on Acute Volume Load, Muscle Activation, Swelling, and Echo-Intensity on the Biceps Brachii in Resistance-Trained Individuals

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Department of Health Science and Human Performance, University of Tampa, Tampa, FL 33606, USA

School of Physical Education, University of Campinas, Campinas 13083-851, Brazil

Author to whom correspondence should be addressed.

Sports 2019, 7(9), 204; https://doi.org/10.3390/sports7090204

Received: 2 August 2019 / Revised: 31 August 2019 / Accepted: 2 September 2019 / Published: 4 September 2019

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Abstract

There is a paucity of data on how manipulating joint angles during isolation exercises may impact overall session muscle activation and volume load in resistance-trained individuals. We investigated the acute effects of varying glenohumeral joint angle on the biceps brachii with a crossover repeated measure design with three different biceps curls. One session served as the positive control (CON), which subjects performed 9 sets of bicep curls with their shoulder in a neutral position. The experimental condition (VAR), varied the glenohumeral joint angle by performing 3 sets in shoulder extension (30°), 3 sets neutral (0°), and 3 sets in flexion (90°). Volume load and muscle activation (EMG) were recorded during the training sessions. Muscle swelling and strain were assessed via muscle thickness and echo-intensity responses at pre, post, 24 h, 48 h, and 72 h. There were no significant differences between conditions for most dependent variables. However, the overall session EMG amplitude was significantly higher (p = 0.0001) in VAR compared to CON condition (95%-CI: 8.4% to 23.3%). Our findings suggest that varying joint angles during resistance training (RT) may enhance total muscle activation without negatively affecting volume load within a training session in resistance-trained individuals. View Full-Text

Keywords: muscle length-tension relationship; bodybuilding; exercise selection; echo-intensity; muscle strain

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Barakat, C.; Barroso, R.; Alvarez, M.; Rauch, J.; Miller, N.; Bou-Sliman, A.; De Souza, E.O. The Effects of Varying Glenohumeral Joint Angle on Acute Volume Load, Muscle Activation, Swelling, and Echo-Intensity on the Biceps Brachii in Resistance-Trained Individuals. Sports 2019, 7, 204. https://doi.org/10.3390/sports7090204

AMA Style

Barakat C, Barroso R, Alvarez M, Rauch J, Miller N, Bou-Sliman A, De Souza EO. The Effects of Varying Glenohumeral Joint Angle on Acute Volume Load, Muscle Activation, Swelling, and Echo-Intensity on the Biceps Brachii in Resistance-Trained Individuals. Sports. 2019; 7(9):204. https://doi.org/10.3390/sports7090204

Chicago/Turabian Style

Barakat, Christopher, Renato Barroso, Michael Alvarez, Jacob Rauch, Nicholas Miller, Anton Bou-Sliman, and Eduardo O. De Souza. 2019. "The Effects of Varying Glenohumeral Joint Angle on Acute Volume Load, Muscle Activation, Swelling, and Echo-Intensity on the Biceps Brachii in Resistance-Trained Individuals" Sports 7, no. 9: 204. https://doi.org/10.3390/sports7090204

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The Effects of Varying Glenohumeral Joint Angle on Acute Volume Load, Muscle Activation, Swelling, and Echo-Intensity on the Biceps Brachii in Resistance-Trained Individuals

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