scholarly journals A Comparison of EMG Activity for the Middle and Lower Trapezius Muscle in the Frontal and Scapular Plane According to Shoulder Abduction Angles

2016 ◽  
Vol 14 (2) ◽  
pp. 131-137 ◽  
Author(s):  
Byung-Kon Kim ◽  
Myoung-Hee Lee
Keyword(s):  
Trapezius Muscle ◽  
Emg Activity ◽  
Shoulder Abduction ◽  
Lower Trapezius ◽  
Scapular Plane

Effect of physical training on function of chronically painful muscles: a randomized controlled trial

2008 ◽  
Vol 105 (6) ◽  
pp. 1796-1801 ◽  
Author(s):  
Lars L. Andersen ◽  
Christoffer H. Andersen ◽  
Mette K. Zebis ◽  
Pernille K. Nielsen ◽  
Karen Søgaard ◽  
...  
Keyword(s):  
Strength Training ◽  
Controlled Trial ◽  
Trapezius Muscle ◽  
Maximal Activity ◽  
Emg Activity ◽  
Shoulder Abduction ◽  
Specific Strength ◽  
Randomized Controlled ◽  
Upper Trapezius ◽  
Trapezius Myalgia

Pain and tenderness of the upper trapezius muscle is frequent in several occupational groups. The objective of this study is to investigate the effect of three contrasting interventions on muscle function and pain in women with trapezius myalgia. A group of employed women ( n = 42) with a clinical diagnosis of trapezius myalgia participated in a 10-wk randomized controlled intervention: specific strength training of the neck/shoulder muscles, general fitness training performed as leg bicycling, or a reference intervention without physical activity. Torque and electromyography (EMG) were recorded during maximal shoulder abductions in an isokinetic dynamometer at −60, 60, 0, and 180°/s. Furthermore, a submaximal reference contraction with only the load of the arms was performed. Significant changes were observed only in the specific strength training group. Pain decreased by 42–49% ( P < 0.01–0.05). Whereas the EMG activity of the unaffected deltoid remained unchanged during the maximal contractions, an increase in EMG amplitude (42–86%; P < 0.001–0.05) and median power frequency (19%; P < 0.001) were observed for the painful trapezius muscle. Correspondingly, torque increased by 18–53% ( P < 0.001–0.05). EMG during the reference contraction decreased significantly for both the trapezius and deltoid muscles ( P < 0.01). In conclusion, specific strength training relieves pain and increases maximal activity specifically of the painful trapezius muscle, leading to increased shoulder abduction strength in women with trapezius myalgia. Furthermore, decreased relative workload may indirectly augment pain reduction.

The Effect of Upper Trapezius Taping on Electromyographic Activity in the Upper and Middle Trapezius Region

1997 ◽  
Vol 6 (4) ◽  
pp. 309-318 ◽  
Author(s):  
Gary E. Morin ◽  
David Tiberio ◽  
Gary Austin
Keyword(s):  
Isometric Contraction ◽  
Trapezius Muscle ◽  
Emg Activity ◽  
Electromyographic Activity ◽  
Upper Trapezius ◽  
Shoulder Muscles ◽  
Lower Trapezius ◽  
The Right ◽  
Relationship Of ◽  
Muscular Imbalance

A characteristic of scapulothoracic dysfunction is the tendency for the upper regions of the trapezius to hypertrophy in relation to its middle and lower portions. This creates a muscular imbalance that can alter scapular position and subsequently the length–tension relationship of the shoulder muscles. Tape was applied over the right upper trapezius to inhibit electrical activity in the muscles of 10 uninjured subjects. EMG activity was recorded in two locations of the upper trapezius and one location in the middle to lower trapezius region while each subject maintained an isometric contraction designed to activate both muscles. With the tape applied, there was a statistically significant reduction in EMG activity of the upper trapezius with a corresponding increase in the middle/lower trapezius. The ability of the tape to alter trapezius activity in this fashion may help correct muscular imbalances in the trapezius muscle.

scholarly journals The Effect of Shoulder Abduction Angle on Trapezius Muscle Activity During Scapular Retraction Exercise

2021 ◽  
Author(s):  
Dilara Kara ◽  
Gulcan Harput ◽  
Irem Duzgun
Keyword(s):  
Muscle Activity ◽  
Trapezius Muscle ◽  
Biomechanical Analysis ◽  
Abduction Angle ◽  
Shoulder Abduction ◽  
Maximum Voluntary Isometric Contraction ◽  
Upper Trapezius ◽  
Elastic Resistance ◽  
Asymptomatic Individuals ◽  
Lower Trapezius

Abstract Context: Scapular retraction exercises are often prescribed to enhance scapular stabilization. Objectives: To investigate the upper trapezius (UT), middle trapezius (MT), lower trapezius (LT) activities, and UT/MT and UT/LT ratios during scapular retraction exercise with elastic resistance at different shoulder abduction angles. Design: Descriptive laboratory study. Setting: Biomechanical analysis laboratory. Patients or Other Participants: Thirty-five asymptomatic individuals. Main Outcome Measures: Surface electromyography was used to evaluate UT, MT, and LT activities during the scapular retraction exercise at 0º, 45º, 90º, and 120º shoulder abductions. Results: The mean muscle activity ranged from 15.8%–54.7% maximum voluntary isometric contraction (MVIC) for UT, 30.5%–51.6% MVIC for MT, 21.4%–25.5% MVIC for LT. A significant "muscle×angle" interaction was found (p&lt;0.001). Post hoc analysis revealed that the MT was significantly more activated than UT and LT during both retraction at 0º (p&lt;0.001; p=0.01, respectively) and 120º (p=0.03; p=0.002, respectively). During retraction at 45º and 90º, the LT generated significantly lower activity than the UT (p=0.02; p=0.03, respectively) and MT (p&lt;0.001; p=0.002, respectively). Besides, UT/MT and UT/LT ratios during retraction at 0º were significantly lower than 45º (p=0.03; p=0.001, respectively) and 90º (p&lt;0.001; p&lt;0.001, respectively). Retraction at 90º resulted significantly higher UT/LT ratio than 45º (p=0.004) and 120º (p=0.004). Conclusions: Due to lower UT activity relative to MT, retraction at 0º, 45º, and 120º can be preferred in early shoulder training or rehabilitation. Additionally, retraction at 90º was the most effective exercise in activating entire trapezius muscle parts.

scholarly journals Effects of Intended Scapular Posterior Tilt Motion on Trapezius Muscle Electromyography Activity

2021 ◽  
Vol 18 (17) ◽  
pp. 9147
Author(s):  
Soo-Yong Kim ◽  
Il-Young Yu ◽  
Jae-Seop Oh ◽  
Min-Hyeok Kang
Keyword(s):  
Tilt Angle ◽  
Muscle Activity ◽  
Muscle Activation ◽  
Trapezius Muscle ◽  
Emg Activity ◽  
Upper Trapezius ◽  
Posterior Tilt ◽  
Lower Trapezius ◽  
Trunk Extension ◽  
Asymptomatic Men

The intended scapular motion is a strategy to strengthen the lower trapezius (LT). However, few studies have explored the effects of the intended scapular posterior tilt motion on selective LT activation. Thus, the present study investigated the effect of the intended scapular posterior tilt on the electromyography (EMG) activity of trapezius muscles during prone shoulder horizontal abduction (PSHA). Eighteen asymptomatic men performed three types of PSHA: (1) preferred PSHA, (2) PSHA with the intended scapular posterior tilt, and (3) PSHA with the intended scapular posterior tilt and trunk extension. EMG activity of the upper trapezius (UT), middle trapezius (MT), and LT were measured during PSHAs. Scapular posterior tilt angle, with and without the intended scapular posterior tilt, were measured using inclinometer. The results indicated that LT muscle activity increased when scapular posterior tilt was applied with and without trunk extension (14–16%), compared to the preferred condition, during PSHA (p < 0.05). However, the addition of trunk extension to PSHA with the intended scapular posterior tilt increased the UT muscle activity (28%) and the UT/LT (29%) and UT/MT (31%) ratios (p < 0.05). The scapular posterior tilt angle was higher (15%) when applying the intended scapular posterior tilt (p = 0.020). These findings suggest that the intended scapular posterior tilt may be a useful strategy for selective LT muscle activation.

scholarly journals Theraband applications for improved wall slide exercise

2021 ◽  
Author(s):  
Özgün Uysal ◽  
A. Sinan Akoğlu ◽  
Dilara Kara ◽  
A. Çağatay Sezik ◽  
Mahmut Çalık ◽  
...  
Keyword(s):  
Upper Extremity ◽  
Surface Emg ◽  
Emg Activity ◽  
Shoulder Abduction ◽  
Moderate Activity ◽  
Serratus Anterior ◽  
Shoulder Muscles ◽  
Lower Trapezius ◽  
University Laboratory ◽  
Low Activity

Context: The wall slide exercise is commonly used in clinic and research settings. Theraband positioning variations for hip exercises are investigated and used, but theraband positioning variations for upper extremity wall slide exercise, though not commonly used, are not investigated. Objective: To investigate the effect of different theraband positions (elbow and wrist) on scapular and shoulder muscles' activation in wall slide exercises and compare them to the regular wall slide exercise for the upper limbs. Study Design: Descriptive Laboratory Study. Setting: University Laboratory Patients or Other Participants: 20 participants with healthy shoulders Interventions: Participants performed regular and two different variations of wall slide exercises (theraband at wrist and theraband at elbow) in randomized order. Main Outcome Measures: Surface EMG activity of the trapezius muscles (upper [UT], middle [MT], and lower trapezius [LT]), infraspinatus (IS), middle deltoid (MD), and serratus anterior (SA). Results: Regular wall slide exercise elicited low activity in MD and moderate activity in SA muscles (32% MVIC), while theraband at wrist and elbow variations elicited low activity in MT, LT, IS, and MD muscles and moderate activity in SA muscles (46% and 34% MVICs, respectively). UT activation was absent to minimal (0–15% MVIC) in all wall slide exercise variations. Theraband at wrist produced lower UT/MT, UT/LT, and UT/SA levels. Conclusion: In shoulder rehabilitation, clinicians desiring to activate scapular stabilization muscles should consider using theraband at wrist variation; clinicians desiring to achieve more shoulder abduction activation and less scapular stabilization should consider theraband at elbow variation of upper extremity wall slide exercise.

scholarly journals Motion Analytics of Trapezius Muscle Activity in an 18-Year-Old Female with Extended Upper Brachial Plexus Birth Palsy

2021 ◽  
Vol 16 (01) ◽  
pp. e51-e55
Author(s):  
Jasmine J. Lin ◽  
Gromit Y.Y. Chan ◽  
Cláudio T. Silva ◽  
Luis G. Nonato ◽  
Preeti Raghavan ◽  
...  
Keyword(s):  
Brachial Plexus ◽  
Upper Extremity ◽  
Muscle Activity ◽  
Visual Analytics ◽  
Three Dimensional ◽  
Trapezius Muscle ◽  
Shoulder Abduction ◽  
Upper Trapezius ◽  
Brachial Plexus Birth Palsy ◽  
Birth Palsy

Abstract Background The trapezius muscle is often utilized as a muscle or nerve donor for repairing shoulder function in those with brachial plexus birth palsy (BPBP). To evaluate the native role of the trapezius in the affected limb, we demonstrate use of the Motion Browser, a novel visual analytics system to assess an adolescent with BPBP. Method An 18-year-old female with extended upper trunk (C5–6–7) BPBP underwent bilateral upper extremity three-dimensional motion analysis with Motion Browser. Surface electromyography (EMG) from eight muscles in each limb which was recorded during six upper extremity movements, distinguishing between upper trapezius (UT) and lower trapezius (LT). The Motion Browser calculated active range of motion (AROM), compiled the EMG data into measures of muscle activity, and displayed the results in charts. Results All movements, excluding shoulder abduction, had similar AROM in affected and unaffected limbs. In the unaffected limb, LT was more active in proximal movements of shoulder abduction, and shoulder external and internal rotations. In the affected limb, LT was more active in distal movements of forearm pronation and supination; UT was more active in shoulder abduction. Conclusion In this female with BPBP, Motion Browser demonstrated that the native LT in the affected limb contributed to distal movements. Her results suggest that sacrificing her trapezius as a muscle or nerve donor may affect her distal functionality. Clinicians should exercise caution when considering nerve transfers in children with BPBP and consider individualized assessment of functionality before pursuing surgery.

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