Browsing by Subject "Electromyography"

Now showing 1 - 5 of 5
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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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    Effect of different cranio-cervical positions on abdominal and back muscles activities from different postures: A cross-section study
    (Universidad de Murcia. Servicio de Publicaciones, 2024) Mohamed Saleh, Amir; Mohamed Badaway, Hassan; Mahgoub Mostafa, Mohamed Serag Eldein; Hesham Abouelenein, Mohamed
    The aim of this study was to investigate whether changing cranio-cervical postures is associated with changes in abdominal and back muscle activities during bridging and plank positions, and to present the importance of cranio-cervical posture control during trunk stabilization exercises. This was a cross-sectional study that included thirty patients (21 men and 9 women), aged between 18 and 30 years, with no history of previous spinal surgery, other severe musculoskeletal disorders, or neurological disorders, selected from Cairo University's Faculty of Physical Therapy. Every patient was requested to adopt a bridging and a plank position. Surface Electromyography (EMG) was used to assess muscular activation patterns by measuring muscle activity amplitudes. EMG signals of rectus abdominus and lumbar erector spinae in different cranio-cervical postures (extension 25°, neutral, and flexion 25°) were compared. The cranio-cervical posture was controlled utilizing a cervical range of motion device (CROM). Cranio-cervical posture was found to significantly influence trunk muscle activities (p=0.001), with cranio-cervical flexion yielding the highest activity in the rectus abdominus in both bridging (p=0.001) and plank positions (p=0.001), while cranio-cervical extension yielded the highest activity in the lumbar erector spinae in both bridging (p=0.001) and plank positions (p=0.017). Cranio-cervical flexion increased rectus abdominus muscle activity during the bridging and plank positions, while cranio-cervical extension improved lumbar erector spinae muscle activity during the bridging and plank positions. Consideration of cranio-cervical posture is suggested when carrying out trunk stabilization exercises.
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    Fall risk detection mechanism in the elderly, based on electromyographic signals, through the use of artificial intelligence
    (Universidad de Murcia, Servicio de Publicaciones, 2023) Arias-Poblete, Leónidas; Álvarez‐Arangua, Sebastián; Jerez-Mayorga, Daniel; Chamorro, Claudio; Ferrero‐Hernández, Paloma; Ferrari, Gerson; Farías‐Valenzuela, Claudio
    Introduction: The tests used to classify older adults at risk of falls are questioned in literature. Tools from the field of artificial intelligence are an alternative to classify older adults more precisely. Objective: To identify the risk of falls in the elderly through electromyographic signals of the lower limb, using tools from the field of artificial intelligence. Methods: A descriptive study design was used. The unit of analysis was made up of 32 older adults (16 with and 16 without risk of falls). The electrical activity of the lower limb muscles was recorded during the functional walking gesture. The cycles obtained were divided into training and validation sets, and then from the amplitude variable, select attributes using the Weka software. Finally, the Support Vector Machines (SVM) classifier was implemented. Results: A classifier of two classes (elderly adults with and without risk of falls) based on SVM was built, whose performance was: Kappa index 0.97 (almost perfect agreement strength), sensitivity 97%, specificity 100%. Conclusions: The SVM artificial intelligence technique applied to the analysis of lower limb electromyographic signals during walking can be considered a precision tool of diagnostic, monitoring and follow-up for older adults with and without risk of falls.
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    La fotobiomodulación puede aumentar la tolerancia al ejercicio y la activación de los músculos del antebrazo en hombres sanos: un estudio cruzado, aleatorizado y controlado con placebo
    (Universidad de Murcia: servicio de publicaciones, 2025) Zago, Julio; Santos, Francisco Valdez; Vieira, Paulo, J.C; Rondinel, Tatiana; Diefenthaeler, Fernando; Machado, Sergio; Aprigliano, Vicente; Silva, Weder Alves; Inacio, Pedro Augusto; Sá Filho, Alberto; Chiappa, Gaspar R.; Sin departamento asociado
    Despite the positive effects of photobiomodulation (PBM) on muscle behavior, its effects on exercise tolerance and reactive hyperemia (RH) are poorly understood. Objective: assess the acute effects of PBM with 904 and 660, nm wavelengths irradiated at the forearm flexor muscles on exercise tolerance through the analysis of RH and muscle activation. This preliminary, double-blind, placebo-controlled crossover trial was performed with 11 healthy participants. We randomly applied PBM 904nm, PBM 660nm, and placebo at six different points at the dominant flexor muscle area. The placebo group received the stimulation at the same points with a turned-off device. RH was assessed by measuring forearm blood flow which was calculated using the peak blood flow after the 5-min occlusion with the technique of venous occlusion plethysmography. Electromyography was assessed through surface electrodes on three flexor forearm muscles. The root mean square (RMS) and median frequency (MDF) were plotted at 25, 50, 75, and 100% of the limit of tolerance (Tlim). PBM 660 irradiation significantly increased RH when compared to PBM 904 and placebo. Furthermore, PBM 660 and 904 increased RMS and reduced MDF when compared to placebo. PBM 660 irradiation was superior to 904 and placebo in the increase of RH but the application of both irradiations was similar in the activation of forearm muscles in healthy men. Trial registration: www.ensaiosclinicos.gov.br RBR-7yspdx
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    The combination of different ergonomic supports during dental procedures reduces the muscle activity of the neck and shoulder
    (MDPI, 2019-08-15) García Vidal, José Antonio; López Nicolás, Manuel; Sánchez Sobrado, Ana C.; Escolar Reina, María P.; Medina Mirapeix, Francesc; Bernabeu Mora, Roberto; Fisioterapia
    Ergonomic supports have become popular for the prevention of musculoskeletal disorders. This study sought to evaluate the efficacy of different ergonomic supports and their combination to reduce muscle activity of the neck and shoulder muscles. A one-way repeated measures design was used to evaluate 36 practicing dentists while they performed three posterior composite restoration procedures on a phantom head. Portable surface electromyography (sEMG) recordings were used to measure the muscle activity of three muscles (Upper Trapezius, Lateral Deltoid and Anterior Deltoid) in the dominant upper extremity, with and without the use of different ergonomic supports (ergonomic stool, magnification lenses and both) during the performance of these tasks. A repeated measures analysis of variance was used. The muscle activity of all muscles differed significantly across the four ergonomic conditions during the three tasks. The use of ergonomic supports such as magnification lenses, the ergonomic stool, or the combination of both, is effective for decreasing the muscle activity of the three muscles during the three tasks, when compared to standard practice. In addition, the decrease of muscle activity was higher using magnification lenses when compared to the ergonomic stool. Furthermore, the greatest decrease was found with the combination of both supports