Alterations of scapular kinematics and associated muscle activation specific to symptomatic dyskinesis type after conscious control

2016 ◽  
Vol 26 ◽  
pp. 97-103 ◽  
Author(s):  
Hsiang-Ling Ou ◽  
Tsun-Shun Huang ◽  
Yu-Ting Chen ◽  
Wen-Yin Chen ◽  
Yu-Li Chang ◽  
...  
Keyword(s):  
Muscle Activation ◽  
Scapular Kinematics ◽  
Conscious Control

scholarly journals Shoulder External Rotation Fatigue and Scapular Muscle Activation and Kinematics in Overhead Athletes

2011 ◽  
Vol 46 (4) ◽  
pp. 349-357 ◽  
Author(s):  
Mithun Joshi ◽  
Charles A. Thigpen ◽  
Kevin Bunn ◽  
Spero G. Karas ◽  
Darin A. Padua
Keyword(s):  
Muscle Fatigue ◽  
Muscle Activation ◽  
External Rotation ◽  
Shoulder Injuries ◽  
Serratus Anterior ◽  
Overhead Athletes ◽  
Scapular Kinematics ◽  
Fatigue Protocol ◽  
Upper Trapezius ◽  
Lower Trapezius

Context: Glenohumeral external rotation (GH ER) muscle fatigue might contribute to shoulder injuries in overhead athletes. Few researchers have examined the effect of such fatigue on scapular kinematics and muscle activation during a functional movement pattern. Objective: To examine the effects of GH ER muscle fatigue on upper trapezius, lower trapezius, serratus anterior, and infraspinatus muscle activation and to examine scapular kinematics during a diagonal movement task in overhead athletes. Setting: Human performance research laboratory. Design: Descriptive laboratory study. Patients or Other Participants: Our study included 25 overhead athletes (15 men, 10 women; age = 20 ± 2 years, height = 180 ± 11 cm, mass = 80 ± 11 kg) without a history of shoulder pain on the dominant side. Intervention(s): We tested the healthy, dominant shoulder through a diagonal movement task before and after a fatiguing exercise involving low-resistance, high-repetition, prone GH ER from 0° to 75° with the shoulder in 90° of abduction. Main Outcome Measure(s): Surface electromyography was used to measure muscle activity for the upper trapezius, lower trapezius, serratus anterior, and infraspinatus. An electromyographic motion analysis system was used to assess 3-dimensional scapular kinematics. Repeated-measures analyses of variance (phase × condition) were used to test for differences. Results: We found a decrease in ascending-phase and descending-phase lower trapezius activity (F1,25 = 5.098, P = .03) and an increase in descending-phase infraspinatus activity (F1,25 = 5.534, P = .03) after the fatigue protocol. We also found an increase in scapular upward rotation (F1,24 = 3.7, P = .04) postfatigue. Conclusions: The GH ER muscle fatigue protocol used in this study caused decreased lower trapezius and increased infraspinatus activation concurrent with increased scapular upward rotation range of motion during the functional task. This highlights the interdependence of scapular and glenohumeral force couples. Fatigue-induced alterations in the lower trapezius might predispose the infraspinatus to injury through chronically increased activation.

Effects of Kinesiology Taping on Scapular Reposition Accuracy, Kinematics, and Muscle Activity in Athletes With Shoulder Impingement Syndrome: A Randomized Controlled Study

2018 ◽  
Vol 27 (6) ◽  
pp. 560-569 ◽  
Author(s):  
Yi-Fen Shih ◽  
Ya-Fang Lee ◽  
Wen-Yin Chen
Keyword(s):  
Muscle Activation ◽  
Position Sense ◽  
Joint Position Sense ◽  
Controlled Study ◽  
Shoulder Impingement ◽  
Scapular Kinematics ◽  
Randomized Controlled ◽  
Upper Trapezius ◽  
Posterior Tilt ◽  
Lower Trapezius

Context:Scapular proprioception is a key concern in managing shoulder impingement syndrome (SIS). However, no study has examined the effect of elastic taping on scapular proprioception performance.Objective:To investigate the immediate effect of kinesiology taping (KT) on scapular reposition accuracy, kinematics, and muscle activation in individuals with SIS.Design:Randomized controlled study.Setting:Musculoskeletal laboratory, National Yang-Ming University, Taiwan.Participants:Thirty overhead athletes with SIS.Interventions:KT or placebo taping over the upper and lower trapezius muscles.Main Outcome Measures:The primary outcome measures were scapular joint position sense, measured as the reposition errors, in the direction of scapular elevation and protraction. The secondary outcomes were scapular kinematics and muscle activity of the upper trapezius, lower trapezius, and serratus anterior during arm elevation in the scapular plane (scaption).Results:Compared with placebo taping, KT significantly decreased the reposition errors of upward/downward rotation (P = .04) and anterior/posterior tilt (P = .04) during scapular protraction. KT also improved scapular kinematics (significant group by taping effect for posterior tilt,P = .03) during scaption. Kinesiology and placebo tapings had a similar effect on upper trapezius muscle activation (significant taping effect,P = .003) during scaption.Conclusions:Our study identified the positive effects of KT on scapular joint position sense and movement control. Future studies with a longer period of follow-up and clinical measurement might help to clarify the clinical effect and mechanisms of elastic taping in individuals with SIS.

scholarly journals Clinical Factors Related to Improved Scapular Control After a Scapular Conscious Control Program in Symptomatic Overhead Athletes: Secondary Analysis of a Randomized Controlled Trial

2020 ◽  
Vol 8 (11) ◽  
pp. 232596712096460
Author(s):  
Tsun-Shun Huang ◽  
Wan-Yu Du ◽  
Jiu-Jenq Lin
Keyword(s):  
Muscle Activation ◽  
Control Program ◽  
Stepwise Logistic Regression ◽  
Posterior Displacement ◽  
Overhead Athletes ◽  
Upper Trapezius ◽  
Inferior Angle ◽  
Arm Elevation ◽  
Potential Factors ◽  
Conscious Control

Background: Predictive variables associated with the effects of a scapular conscious control program should be identified and used to guide rehabilitation programs. Purpose: To determine whether potential factors are associated with the success of scapular muscle balance with an early control program in patients with subacromial pain and scapular dyskinesis. Study Design: Case-control study; Level of evidence, 3. Methods: A total of 38 amateur overhead athletes with subacromial pain and medial border prominence were recruited. They performed progressive conscious control of scapular orientation during 45° and 90° of arm elevation. Stepwise logistic regression and receiver operating characteristic curve were used to determine the optimal cutoff point of related factors for success or failure of the program. Potential factors including pain level during activity, pain duration, anterior/posterior shoulder flexibility, forward shoulder posture, posterior displacement of root of spine and inferior angle, scapular kinematics, and muscle activation before conscious control program were recorded as independent variables. Successful control defined as decreases of the upper trapezius/serratus anterior ratio in 2 consecutive trials of the 90° program or failure in the program was used as a dependent variable. Results: Having a posterior displacement of the inferior angle of the scapula of ≤16.4 mm and scapular posterior tipping during arm elevation of ≤3.3° (collected before the control program) were associated with the success of the program ( R 2 = 0.286; P < .05). Additionally, participants with each or both variables present at baseline had probabilities of success of 78% and 95%, respectively. Conclusion: The value of scapular posterior displacement and posterior tilt should be considered before early scapular control program. Other factors related to the success of the program should be found due to the limited variance explained in the regression model.

scholarly journals Swimming Practice and Scapular Kinematics, Scapulothoracic Muscle Activity, and the Pressure-Pain Threshold in Young Swimmers

2018 ◽  
Vol 53 (11) ◽  
pp. 1056-1062
Author(s):  
Fernanda A. P. Habechian ◽  
Ana Letícia Lozana ◽  
Ann M. Cools ◽  
Paula R. Camargo
Keyword(s):  
Upper Extremity ◽  
Analysis Of Variance ◽  
Muscle Activity ◽  
Pain Sensitivity ◽  
Muscle Activation ◽  
Pain Threshold ◽  
Pressure Pain Threshold ◽  
Scapular Kinematics ◽  
Upper Trapezius ◽  
Competitive Swimmers

Context Whereas alterations in scapular kinematics, scapulothoracic muscle activity, and pain sensitivity have been described in adult swimmers, no researchers have examined these outcomes in young swimmers. Objectives To compare scapular kinematics, scapulothoracic muscle activation, and the pressure-pain threshold (PPT) of the shoulder muscles among young nonpractitioners (those who were not involved in sports involving the upper limbs), amateur swimmers, and competitive swimmers. Design Cross-sectional study. Setting Laboratory. Patients or Other Participants A total of 90 individuals (age = 11.63 ± 0.61 years) in 3 groups: nonpractitioners, amateur swimmers, and competitive swimmers. Intervention(s) Scapular kinematics and activity of the upper trapezius, lower trapezius, and serratus anterior (SA) were measured during upper extremity elevation in the scapular plane. The PPT was assessed in the upper trapezius, infraspinatus, supraspinatus, middle deltoid, and tibialis anterior. Main Outcome Measure(s) Scapular kinematics, scapulothoracic muscle activation, and PPT. We conducted a 2-way mixed-model analysis of variance and a 1-way analysis of variance for scapular rotation and PPT, respectively. A Kruskal-Wallis test was used to assess muscle activity. The α level was set at .05. Results Competitive swimmers presented more internal rotation at 90° (P = .03) and 120° (P = .047) and more anterior tilt at 90° (P = .03) than nonpractitioners. Amateur swimmers demonstrated more anterior tilt at 90° (P = .004) and 120° (P = .005) than nonpractitioners. Competitive swimmers had greater SA activation in the intervals from 60° to 90° (P = .02) and 90° to 120° (P = .01) than amateur swimmers. They also displayed more SA activation in the interval from 90° to 120° than nonpractitioners (P = .04). No differences were found in any of the muscles for the PPT (P &gt; .05). Conclusions Young competitive swimmers presented alterations in scapular kinematics and scapulothoracic muscle activation during upper extremity elevation that may be due to sport practice. Mechanical pain sensitivity was not altered in young swimmers.

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