Scapular Muscular Activity With Shoulder Impingement Syndrome During Lowering of the Arms

Faria, Christina Danielli Coelho de Morais; Teixeira-Salmela, Luci Fuscaldi; Goulart, Fátima; Moraes, Geraldo Fabiano de Souza

doi:10.1097/jsm.0b013e318160c05d

Cited by 31 publications

(46 citation statements)

References 21 publications

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“…Borstad and Ludewig (2002) compared three-dimensional scapular kinematics during elevation and lowering of the arm in subjects with and without SIS, and group differences tended to be magnified in the eccentric phase in this study. Lower coactivation of the middle trapezius/serratus anterior muscles was found in subjects with SIS when compared to controls during lowering of the arm (de Morais Faria et al 2008). …”

Section: Introductionmentioning

confidence: 94%

Muscle performance during isokinetic concentric and eccentric abduction in subjects with subacromial impingement syndrome

et al. 2010

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Peak torque (PT), total work (TW) and acceleration time (AT) were measured during isokinetic concentric and eccentric abduction of the shoulder in subjects with subacromial impingement syndrome (SIS) and healthy subjects. The SIS group consisted of 27 subjects (33.48 +/- 9.94 years) with unilateral SIS and it was divided into two groups: (1) SIS with the dominant involved side, (2) SIS with the nondominant involved side. The control group consisted of 23 healthy subjects (32.26 +/- 9.04 years). PT, TW and AT were measured bilaterally at 60 and 180 degrees /s. No significant interactions were found between group and side (P > 0.05), as well as no significant main effects of group and side (P > 0.05) for all variables during concentric abduction of the shoulder at both tested speeds. During the eccentric contractions, lower TW (P < 0.05) was demonstrated by the nondominant uninvolved side of SIS group at 60 degrees /s, and by the uninvolved sides of the SIS groups at 180 degrees /s compared to the dominant side of the controls. At 180 degrees /s, the nondominant uninvolved side of the SIS group demonstrated slower AT (P < 0.05) compared to the dominant side of the control group, as well as the nondominant involved side of the SIS group compared to the nondominant side of the controls. The results showed no alterations in the measured parameters during concentric and eccentric phases of isokinetic abduction in subjects with SIS when compared to a control group. However, alterations may be observed in the contralateral side during the eccentric phase of abduction in subjects with unilateral conditions of SIS.

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Section: Introductionmentioning

confidence: 94%

Muscle performance during isokinetic concentric and eccentric abduction in subjects with subacromial impingement syndrome

et al. 2010

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“…The number of muscles contributing to movement and the degrees of freedom of motion make the study of motor control at the shoulder extremely difficult. Several authors have described the timing of shoulder muscle activation onset during arm motions [5,22,54], others have reported muscle activation magnitudes [8,31], while some have reported the ratio of activation magnitude for several pairs of synergistic muscles at the shoulder [7,8]. All of these efforts have contributed valuable knowledge of how the neuromuscular system controls motion at the shoulder complex.…”

Section: Introductionmentioning

confidence: 99%

“…If the loaded tissue is unable to manage or adapt, pathology may result. Biomechanical faults may originate through repetitive movement patterns that gradually alter tissue extensibility or from neuromuscular activation alterations secondary to a stimulus such as pain [7,8,32,38]. Neuromuscular alterations are particularly problematic as they can interfere with the complex timing and muscle synergies that are critical to shoulder movement [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Scapular muscle activation and co-activation following a fatigue task

Szucs

Navalgund

Borstad

2009

Med Biol Eng Comput

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Scapular muscles precisely move the scapulothoracic articulation and if fatigued may contribute to pathology. Fatigue of serratus anterior may be a mechanism for shoulder pathology by altering scapula motions and requiring compensation by other shoulder muscles. A total of 28 asymptomatic subjects performed a task to fatigue the serratus anterior, while muscle activity was recorded from three muscles. Mean normalized activation levels and activation ratios were examined before and after the fatigue task during arm elevation and lowering. All muscles demonstrated meaningful declines in the median frequency of the electromyographic signal during the task. Following the task, only the upper trapezius had higher mean activation levels (mean difference 10.79% MVIC), while the serratus anterior/lower trapezius activation ratio was altered (mean difference -0.3). Higher mean upper trapezius activation may be compensatory for fatigue of other shoulder muscles and may reflect fiber type or central control mechanisms. Serratus anterior eccentric endurance training may be beneficial for the prevention of shoulder pathology.

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“…Scapulothoracic muscle weakness is a cause of scapular instability and contributes to secondary subacrominal impingement syndrome 1,4,5) . In athletes or workers who perform repeated overhead movements, shoulder muscle fatigue may result from shoulder pathologies 6 , 7 ) , and muscle imbalance caused by acute muscle fatigue may impede normal muscular activation 8,9) . Several studies have revealed the importance of scapular muscle strength, neuromuscular control and scapular stability for normal shoulder functioning 4,10,11) .…”

Section: Introductionmentioning

confidence: 99%

Activation and Ratio of the Upper Trapezius and Serratus Anterior Muscles during Dynamic and Isometric Exercises on Various Support Surfaces

Yoo

Hwang

2010

J Phys Ther Sci

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Abstract. [Purpose] This study compared the activations of the upper trapezius (UT) and serratus anterior (SA) muscles and the SA/UT activation ratio during dynamic and isometric exercises on various support surfaces.[Subjects] We recruited 12 male subjects, all right-side dominant and with no congenital deformities in the upper extremities and no orthopedic or neurological disorders.[Methods] Push-ups and push-ups plus position maintenance exercises were performed on three different base surfaces: a wobble board, dual wobble boards, and a one-sided wobble board. Electromyography activities of the SA and UT muscles were recorded.[Results] The SA/UT ratio was significantly higher when dynamic exercises were performed using the one-sided wobble board than when they were performed on a normal wobble board or with dual wobble boards. The SA/UT ratio was significantly higher when isometric exercises were performed using a wobble board than when they were performed with a one-sided wobble board.[Conclusion] For clinical applications with a goal of selected SA muscle strengthening, greater benefit is achieved with isometric exercises performed on an unstable support surface and dynamic exercises performed on a stable support surface, as measured by the SA/UT ratio.

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Scapular Muscular Activity With Shoulder Impingement Syndrome During Lowering of the Arms

Cited by 31 publications

References 21 publications

Muscle performance during isokinetic concentric and eccentric abduction in subjects with subacromial impingement syndrome

Muscle performance during isokinetic concentric and eccentric abduction in subjects with subacromial impingement syndrome

Scapular muscle activation and co-activation following a fatigue task

Activation and Ratio of the Upper Trapezius and Serratus Anterior Muscles during Dynamic and Isometric Exercises on Various Support Surfaces

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