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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

1
Department of Health Science and Human Performance, University of Tampa, Tampa, FL 33606, USA
2
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
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 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.

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