Browsing by Subject "EMG"

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    Comparison of Electromyographic Activity during Barbell Pullover and Straight Arm Pulldown Exercises
    (MDPI, 2022-11-03) Muyor, José M.; López Miñarro, Pedro Ángel; Alacid, Fernando; Expresión Plástica, Musical y Dinámica
    Pullover and straight arm pulldown exercises are commonly used in resistance exercise programs to improve sports performance or in physical activity health programs. This study aimed to evaluate the individual electromyographic (EMG) activity of the pectoralis major (clavicular, sternal, and costal portions), latissimus dorsi, anterior deltoid, triceps brachii, and rectus abdominis muscles in a barbell pullover exercise at a 100% biacromial width and a straight arm pulldown exercise at a 100% and 150% biacromial width and to compare the EMG activity in these selected muscles and exercises. Twenty healthy and physically active adults performed a set of eight repetitions of each exercise against 30% of their body mass. The barbell pullover exercise presented a higher EMG activity (p ≤ 0.01) than the straight arm pulldown exercise in both biacromial widths in all evaluated muscles except for the latissimus dorsi and the triceps brachii. These muscles showed the highest EMG activity in the straight arm pulldown exercise at both biacromial widths. In all of the exercises and muscles evaluated, the concentric phase showed a greater EMG activity than the eccentric phase. In conclusion, the barbell pullover exercise can highlight muscle activity in the pectoralis major (mainly in the sternal and lower portions), triceps brachii, and rectus abdominis muscles. However, the straight arm pulldown exercise at 100% and 150% biacromial widths could be a better exercise to stimulate the latissimus dorsi and triceps brachii muscles. Moreover, all exercises showed significantly greater EMG activity (p < 0.001) in the concentric phase than in the eccentric phase for all the evaluated muscles.
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    Improving spatio-temporal stride parameters, lower limb muscles activity and race walkers’ records after 12-weeks special exercises using rhythmic auditory
    (Universidad de Murcia, Servicio de Publicaciones, 2023) Megahed, Mohamed; Tarek, Zahraa
    This study aims to know the effect of 12-weeks of special exercises using rhythmic auditory to improve spatio-temporal stride parameters (STSP), lower limb muscles activity (LLMA), and 10000m racewalking time (RT). The parameters of STSP are stride length (SL), step cadence (SC), and center-of-mass velocity (CMV). The research sample included twelve racewalkers, and they were divided into two groups (control group and experimental group, six in each). STSP was measured using a Sony camera at a speed of 50 frames/sec for analyzing 25-samples for each racewalker in the 10000m racewalking. LLMA was measured using EMG. In addition, we applied the 10000m test to measure RT. Rhythmic auditory wasused to regulate the step rhythm in seven special exercises and the essential part of the training. The steps rhythm was divided into three levels: the 1st slow auditory rhythm, the 2nd comfortable auditory rhythm, and the 3rd fast auditory rhythm. From our findings, there is a significant difference in the post-test for SC, CMV, LLMA, and RT,favoring the experimental group,where P.04<.05, η2=.732 for SC, P.038<.05, η2=.485 for CMV, P.015<.05, η2=.333 for LLMA, and P.044<.05, η2=.483 for RT. While there is no significant differencein the post-test for SL, where P.264>.05. In addition, there is a significant improvement between groups favoring the experimental group as ROC=1.62,5.76,7.48,33.9, and 7.03% for SL, SC, CMV, LLMA, and RT respectively. Comparisons showed that the post-test achieved greater mprovement with a large effect in STSP, LLMA, and RT compared to the pre-test that achieved a small effect. Therefore, the rhythmic auditoryin the training has a beneficial role in improving spatio-temporal stride parameters, lower limb muscles activity and racewalkers’ records.