Dynamic electromyographic analysis of the throwing shoulder with glenohumeral instability.

Glousman, Ronald E.; Jobe, Frank W.; Tibone, James E.; Moynes, Diane Radovich; Antonelli, Daniel; Perry, Jacquelin

doi:10.2106/00004623-198870020-00009

Cited by 527 publications

(254 citation statements)

References 0 publications

Supporting

Mentioning

213

Contrasting

Unclassified

Order By: Relevance

“…Decreased activation of this muscle has been suggested to potentially result in abnormal scapular motion and contribute to impingement symptoms. 22,23 During the 31-to 60-degree phase, the decreased serratus anterior muscle activity was consistent with decreased upward rotation in the subjects with shoulder impingement. However, after this phase, despite a continued lower level of activity in the serratus anterior muscle, the upward rotation values equalized between the 2 groups.…”

Section: Discussionmentioning

confidence: 76%

“…10,11 Abnormal scapulohumeral rhythm or decreases in upward rotation of the scapula during humeral elevation have been linked to "imbalances" in force production of the upper and lower portions of the trapezius muscle and the serratus anterior muscle. 17,19,[21][22][23] In particular, based on clinical observation, we anticipated increased activation of the upper trapezius muscle in subjects with symptoms of shoulder impingement. The results of our investigation provided some support for this premise.…”

Section: Discussionmentioning

confidence: 99%

“…Investigations of altered scapulothoracic EMG patterns in patient populations have been nonspecific regarding subject diagnoses or restricted to testing of athletic activities. [22][23][24] Use of 2-dimensional (2-D) radiographic and fluoroscopic techniques has shown abnormal shoulder kinematics in some subjects with impingement during humeral elevation. 25,26 The results of these analyses are difficult to interpret, however, because a variety of diagnoses exist in these patients.…”

mentioning

confidence: 99%

“…16,17,19,30,31 Although previous investigations have provided important contributions, they are often constrained by static analysis, 25,27 2-D analysis, 25,26 varied patient diagnoses, 24,25 a lack of control for exposure to overhead activity between subjects with and without symptoms of impingement, 24 -28 small sample sizes, 22,25,26,28 or other methodologic limitations. [22][23][24]28 The purpose of our study was to provide a 3-D analysis of both glenohumeral and scapulothoracic kinematics and associated scapulothoracic muscle activity in subjects with symptoms of shoulder impingement relative to subjects without shoulder impairment who were matched for occupational exposure to overhead work. In our study, we assessed both kinematic and EMG factors believed to be related to impingement.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Alterations in Shoulder Kinematics and Associated Muscle Activity in People With Symptoms of Shoulder Impingement

2000

View full text Add to dashboard Cite

Background and Purpose. Treatment of patients with impingement symptoms commonly includes exercises intended to restore "normal" movement patterns. Evidence that indicates the existence of abnormal patterns in people with shoulder pain is limited. The purpose of this investigation was to analyze glenohumeral and scapulothoracic kinematics and associated scapulothoracic muscle activity in a group of subjects with symptoms of shoulder impingement relative to a group of subjects without symptoms of shoulder impingement matched for occupational exposure to overhead work. Subjects. Fifty-two subjects were recruited from a population of construction workers with routine exposure to overhead work. Methods. Surface electromyographic data were collected from the upper and lower parts of the trapezius muscle and from the serratus anterior muscle. Electromagnetic sensors simultaneously tracked 3-dimensional motion of the trunk, scapula, and humerus during humeral elevation in the scapular plane in 3 handheld load conditions: (1) no load, (2) 2.3-kg load, and (3) 4.6-kg load. An analysis of variance model was used to test for group and load effects for 3 phases of motion (31°-60°, 61°-90°, and 91°-120°). Results. Relative to the group without impingement, the group with impingement showed decreased scapular upward rotation at the end of the first of the 3 phases of interest, increased anterior tipping at the end of the third phase of interest, and increased scapular medial rotation under the load conditions. At the same time, upper and lower trapezius muscle electromyographic activity increased in the group with impingement as compared with the group without impingement in the final 2 phases, although the upper trapezius muscle changes were apparent only during the 4.6-kg load condition. The serratus anterior muscle demonstrated decreased activity in the group with impingement across all loads and phases. Conclusion and Discussion. Scapular tipping (rotation about a medial to lateral axis) and serratus anterior muscle function are important to consider in the rehabilitation of patients with symptoms of shoulder impingement related to occupational exposure to overhead work. [Ludewig PM, Cook TM. Alterations in shoulder kinematics and associated muscle activity in people with symptoms of shoulder impingement. Phys Ther. 2000;80:276 -291.]

show abstract

Section: Discussionmentioning

confidence: 76%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Alterations in Shoulder Kinematics and Associated Muscle Activity in People With Symptoms of Shoulder Impingement

2000

View full text Add to dashboard Cite

show abstract

“…Weakening of the SA is found in baseball players with shoulder joint instability, workers with impingement syndrome of the shoulder joint, and swimmers with pain in the shoulder joint. Decreases in the EMG activity of SA are associated with abnormal scapula movements [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

The Effects of Changes in Hand Position on the Electromyographic Activities of the Shoulder Stabilizer Muscles during Push-up Plus Exercises on Unstable Surfaces

Lee

Park

2013

J Phys Ther Sci

View full text Add to dashboard Cite

Abstract.[Purpose] The purpose of the present study was to examine the effects of changes in hand position on the electromyographic activities of the shoulder stabilizer muscles during push-up plus exercises (PUPE) on unstable surfaces.[Subjects] The subjects of the present study were normal adults in their 20s (n=15). PUPEs were performed with the hands in the neutral positions (NP), internal rotation positions (IRP), and external rotation positions (ERP) using a sling device for the unstable surface. [Methods] We measured the electromyographic activities of the wrist flexor (WF), the wrist extensor (WE), the biceps brachii (BB), the triceps brachii (TB), the upper trapezius (UT), the lower trapezius (LT), the serratus anterior (SA), and the pectoralis major (PM). The muscle activites were compared and analyzed using electromyography.[Results] When hand position changed, WF activity in NP, and SA activity in ERP, were significantly different from their respective activities in the other positions. [Conclusion] To selectively enhance the electromyographic activity of the SA during PUPE using a sling device as an unstable surface, we consider performance of PUPE in ERP is an effective intervention.

show abstract

AAEM practice topics: Technology assessment: Dynamic electromyography in gait and motion analysis

et al. 1996

View full text Add to dashboard Cite

Dynamic electromyographic analysis of the throwing shoulder with glenohumeral instability.

Cited by 527 publications

References 0 publications

Alterations in Shoulder Kinematics and Associated Muscle Activity in People With Symptoms of Shoulder Impingement

Alterations in Shoulder Kinematics and Associated Muscle Activity in People With Symptoms of Shoulder Impingement

The Effects of Changes in Hand Position on the Electromyographic Activities of the Shoulder Stabilizer Muscles during Push-up Plus Exercises on Unstable Surfaces

AAEM practice topics: Technology assessment: Dynamic electromyography in gait and motion analysis

Contact Info

Product

Resources

About