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Abstract Objectives : Purpose The purpose of this research was to study the characteristics and compare the mean and peak electromyography (EMG) while posing 7 standard poses of Thai national bodybuilding athletes. Methods : A total of 10 Thai national bodybuilding athletes (3 World champions and 7 Asian champions) participated in this study. The EMG signals from Biceps brachii (BB), Triceps brachii (TB), Latissimus dorsi (LD), Pectoralis major (PM), Rectus abdominis (RA) and Rectus femoris (RF) were recorded at the frequency of 2,400 Hz while posing for Front double biceps (FDB), Back double biceps (BDB), Front lat spread (FLS), Back lat spread (BLS), Side chest (SC), Side triceps (ST) and Abdominals and Thighs (AT). EMG data were selected in accordance with Bodybuilding and Fitness Sports Association of Thailand’s referee for the best pose and were analyzed with Qualisys track manager software. the mean and peak EMG values of BB, RA, RF, and TB were highest (~30% MVIC and ~50% MVIC, respectively) during AT, FDB, BDB, and ST poses and were lowest (~15% MVIC and ~20% MVIC, respectively) during PM at SC pose. Interestingly, LD showed the least EMG activity (less than 10%MVIC) dur-ing SC, FLS and BLS poses. There were no difference in EMG activity between BB and LD muscles on both the left and right sides, except for BDB pose. Conclusion : EMG activity and pattern of muscles studied varied during 7 mandatory poses. This finding can be used as a reference to the muscle control during champion bodybuilder’s posing and can be applied to training 7 standard poses for novice bodybuilders.
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