Relationship between anthropometric and electromyographic variables of the scapular muscles

Méndez-Rebolledo, Guillermo; Guzmán-Muñoz, Eduardo; Concha-Araya, Juan; Aravena-Falcon, Matias; Galvez-Gonzalez, Victor; Rosa, Francisco Berral de la

doi:10.5114/hm.2020.88147

Cited by 2 publications

(3 citation statements)

References 29 publications

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“…The sEMG signals were full-wave rectified and filtered with a 50-Hz low-pass Butterworth filter (fourth-order, zero delay), in accordance with previous recommendations 15,16 . These procedures facilitate the removal of cardiac artifacts from raw sEMG signals, while simultaneously preserving the signal frequency power and the onset latency of the scapular muscles 19,24 …”

Section: Methodsmentioning

confidence: 99%

“…15,16 These procedures facilitate the removal of cardiac artifacts from raw sEMG signals, while simultaneously preserving the signal frequency power and the onset latency of the scapular muscles. 19,24 The average sEMG amplitude was smoothed (root mean square of 100 ms) for each muscle and calculated for each exercise across the three intermediate repetitions of the completed five repetitions. The first and last repetitions were not used to prevent the data being influenced by habituation or fatigue.…”

Section: Data Processingmentioning

confidence: 99%

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A comparative electromyographic study of scapular stabilizing muscles during five main rehabilitation exercises

Mendez-Rebolledo,

Araya-Quintanilla,

Guzmán-Muñoz

et al. 2024

Am J Phys Med Rehabil

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Objective To compare the surface electromyographic (sEMG) amplitude, activation ratio, and onset latency of the main scapular stabilizing muscles between five typical rehabilitative exercises. Design Twenty-seven healthy participants performed five scapular exercises [wall-slide (WS), wall push-up plus, prone horizontal abduction with external rotation (PHABER), external rotation in side-lying (ERSL), and low row] while simultaneously recording sEMG of serratus anterior (SA), middle trapezius (MT), lower trapezius (LT), and upper trapezius (UT). sEMG amplitudes, onset latencies, and activation ratios were calculated. Results PHABER showed an excellent UT/MT (0.43) and UT/LT (0.30) muscle balance with high (> 50% MVIC) MT and LT amplitudes, a low (< 20% MVIC) UT amplitude, and an early activation of the scapular stabilizing muscles (-474.7 to 89.9 ms) relative to UT. ERSL showed excellent UT/SA (0.26), UT/MT (0.32), and UT/LT (0.21) activation ratios; and along with LR and WS, showed early activation of the scapular stabilizing muscles (-378.1 to -26.6 ms). Conclusions PHABER presented optimal scapular neuromuscular control. Although ERSL, low row, and WS did not meet all the criteria associated with optimal scapular neuromuscular control, these exercises could be used in early stages of shoulder rehabilitation because they favor early activation of the scapular stabilizing muscles.

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Section: Methodsmentioning

confidence: 99%

Section: Data Processingmentioning

confidence: 99%

A comparative electromyographic study of scapular stabilizing muscles during five main rehabilitation exercises

Mendez-Rebolledo,

Araya-Quintanilla,

Guzmán-Muñoz

et al. 2024

Am J Phys Med Rehabil

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“…The first one was the long duration of the protocol, given the necessity of searching for a very specific location for the nerve stimulation, together with the recording of 10 stimuli for each intensity to evoke the H reflex (justified given the high variability of the reflex [60]). Such factor could be associated with higher demands and fatigue, which could affect the scapular muscles' motor control [80] and the EMG signals [81], and could also limit the applicability and prevent quick access to the evaluation results. However, previous studies have reported inconsistent effects with decreased, increased or unchanged ratios of Hmax/Mmax after fatigue [82].…”

Section: Limitationsmentioning

confidence: 99%

Differences in Trapezius Muscle H-Reflex between Asymptomatic Subjects and Symptomatic Shoulder Pain Subjects

Melo

Taylor

Ferreira

et al. 2023

Sensors

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In chronic shoulder pain, adaptations in the nervous system such as in motoneuron excitability, could contribute to impairments in scapular muscles, perpetuation and recurrence of pain and reduced improvements during rehabilitation. The present cross-sectional study aims to compare trapezius neural excitability between symptomatic and asymptomatic subjects. In 12 participants with chronic shoulder pain (symptomatic group) and 12 without shoulder pain (asymptomatic group), the H reflex was evoked in all trapezius muscle parts, through C3/4 nerve stimulation, and the M-wave through accessory nerve stimulation. The current intensity to evoke the maximum H reflex, the latency and the maximum peak-to-peak amplitude of both the H reflex and M-wave, as well as the ratio between these two variables, were calculated. The percentage of responses was considered. Overall, M-waves were elicited in most participants, while the H reflex was elicited only in 58–75% or in 42–58% of the asymptomatic and symptomatic participants, respectively. A comparison between groups revealed that the symptomatic group presented a smaller maximum H reflex as a percentage of M-wave from upper trapezius and longer maximal H reflex latency from the lower trapezius (p < 0.05). Subjects with chronic shoulder pain present changes in trapezius H reflex parameters, highlighting the need to consider trapezius neuromuscular control in these individuals’ rehabilitation.

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Relationship between anthropometric and electromyographic variables of the scapular muscles

Abstract: Purpose. To determine the relationship between skinfolds and onset latency of scapular muscles in healthy young adults. Methods. A cross-sectional study was carried out at the biomechanics and Motor

Cited by 2 publications

References 29 publications

A comparative electromyographic study of scapular stabilizing muscles during five main rehabilitation exercises

A comparative electromyographic study of scapular stabilizing muscles during five main rehabilitation exercises

Differences in Trapezius Muscle H-Reflex between Asymptomatic Subjects and Symptomatic Shoulder Pain Subjects

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