Document Type : Original research papers
Authors
1
Department of Motor Behavior, Faculty of Physical Education and Sports Sciences,University of Tabriz, Tabriz, Iran
2
Department of Motor Behavior, Faculty of Physical Education and Sports Sciences, University of Tabriz, Tabriz, Iran
10.22098/jast.2025.16154.1385
Abstract
Aim: This study aimed to investigate the electromyographic (EMG) activity of selected shoulder girdle muscles in sitting volleyball players during push-up and chest press exercises, performed with and without TRX suspension training. Methods: Ten sitting volleyball players who met the inclusion criteria voluntarily participated in the study. EMG signals were recorded using an 80-channel USB+2 device (frequency: 1000 Hz) and bipolar surface electrodes. The muscles analyzed included the triceps brachii, biceps brachii, and deltoid on both the right and left sides. Signal processing was conducted using OT Biolab software, employing a band-pass filter of 10–350 Hz, and the root mean square (RMS) of the signals was extracted. The maximum voluntary isometric contraction (MVIC) method was used to normalize the EMG signals. Data were analyzed using SPSS software version 22. Statistical tests included the dependent t-test and repeated measures ANOVA to compare the four experimental conditions. Results: The normalized EMG activity of the right and left triceps and deltoid muscles, as well as the right biceps brachii, was significantly higher during TRX push-ups compared to traditional push-ups (p < 0.05). Similarly, during the chest press with TRX, the normalized EMG activity of the right (p = 0.02) and left (p = 0.002) deltoid muscles and the left biceps brachii (p = 0.025) was significantly greater than the chest press using dumbbells. A significant interaction was observed between the TRX and exercise factors (F = 5.34, p = 0.046, ɳ² = 0.37). Additionally, a significant three-way interaction was found among muscle, TRX, and exercise factors (F = 6.31, p = 0.02, ɳ² = 0.61). Conclusion: TRX exercises elicited significantly higher muscle activation compared to traditional exercises. Furthermore, TRX push-ups promoted more symmetrical muscle activity than traditional push-ups. These findings suggest that TRX exercises are an effective and low-risk alternative for inclusion in training programs for sitting volleyball players.
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