scholarly journals Comparison of Muscle Activity Ratio of Upper Trapezius to Serratus Anterior During Shoulder Elevation Between Subjects With and Without Pain Experienced in Upper Trapezius

2014 ◽  
Vol 21 (2) ◽  
pp. 67-73 ◽  
Author(s):  
Sun-Hee Ahn ◽  
Oh-Yun Kwon ◽  
Sung-Dae Choung ◽  
Si-Hyun Kim ◽  
In-Cheol Jeon
Keyword(s):  
Muscle Activity ◽  
Activity Ratio ◽  
Serratus Anterior ◽  
Upper Trapezius ◽  
Shoulder Elevation

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

2000 ◽  
Vol 80 (3) ◽  
pp. 276-291 ◽  
Author(s):  
Paula M Ludewig ◽  
Thomas M Cook
Keyword(s):  
Occupational Exposure ◽  
Muscle Activity ◽  
Load Condition ◽  
Trapezius Muscle ◽  
Electromyographic Activity ◽  
Serratus Anterior Muscle ◽  
Serratus Anterior ◽  
Shoulder Impingement ◽  
Upper Trapezius ◽  
Load Conditions

AbstractBackground 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 hand-held 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.

Serratus Anterior and Upper Trapezius Muscle Activity During Upper-Body Exercises

2014 ◽  
Vol 46 ◽  
pp. 248
Author(s):  
Nicole L. Rogers ◽  
Joaquin Calatayud ◽  
Sebastien Borreani ◽  
Juan C. Colado ◽  
N Travis Triplett ◽  
...  
Keyword(s):  
Muscle Activity ◽  
Trapezius Muscle ◽  
Upper Body ◽  
Serratus Anterior ◽  
Upper Trapezius ◽  
Upper Trapezius Muscle

scholarly journals Scapular Muscle Tests in Subjects With Shoulder Pain and Functional Loss: Reliability and Construct Validity

2005 ◽  
Vol 85 (11) ◽  
pp. 1128-1138 ◽  
Author(s):  
Lori A Michener ◽  
N Douglas Boardman ◽  
Peter E Pidcoe ◽  
Angela M Frith
Keyword(s):  
Construct Validity ◽  
Shoulder Pain ◽  
Muscle Activity ◽  
Trapezius Muscle ◽  
Muscle Performance ◽  
Serratus Anterior ◽  
Functional Loss ◽  
Upper Trapezius ◽  
Lower Trapezius ◽  
Isometric Muscle

Abstract Background and Purpose. Scapular muscle performance evaluated with a handheld dynamometer (HHD) has been investigated only in people without shoulder dysfunction for test-retest reliability of data obtained with a single scapular muscle test. The purpose of this study was to assess the reliability, error, and validity of data obtained with an HHD for 4 scapular muscle tests in subjects with shoulder pain and functional loss. Subjects and Methods. Subjects (N=40) with shoulder pain and functional loss were tested bymeasuring the kilograms applied with an HHD during 3 trials for muscle tests for the lower trapezius, upper trapezius, middle trapezius, and serratus anterior muscles. Concurrently, surface electromyography (sEMG) data were collected for the 4 muscles. The same procedures were performed 24 to 72 hours after the initial testing by the same tester. Muscle tests were performed 3 times, and the results were averaged for data analysis. Results. Intraclass correlation coefficients for intratester reliability of measurements of isometricforce obtained using an HHD ranged from .89 to .96. The standard error of the measure (90% confidenceinterval [CI]) ranged from 1.3 to 2.7 kg; the minimal detectable change (90% CI) ranged from 1.8 to 3.6 kg. Construct validity assessment, done by comparing the amounts of isometric muscle activity (sEMG) for each muscle across the 4 muscle tests, revealed that the muscle activity of the upper trapezius and lower trapezius muscles washighest during their respective tests. Conversely, the isometric muscle activity of the middle trapezius and serratus anterior muscles was not highest during their respective tests. Discussion and Conclusion. In people with shoulder pain and functional loss, the intrarater reliability and error over 1 to 3 days were established using an HHD for measurement of isometric force for the assessment of scapular muscle performance. Error values can be used to make decisions regarding individual patients. Construct validity was established for the lower and upper trapezius muscle tests; therefore, these tests are advocated for use. However, construct validity was not demonstrated for the serratus anterior and middle trapezius muscle tests as performed in this study. Further investigation of these muscle tests is warranted.

Comparison of Shoulder Protraction Strength and Electromyography Activity of Serratus Anterior and Pectoralis Major in Subjects With or Without a Winged Scapula

2019 ◽  
Vol 28 (3) ◽  
pp. 272-277 ◽  
Author(s):  
Jun-Seok Kim ◽  
Moon-Hwan Kim ◽  
Duk-Hyun Ahn ◽  
Jae-Seop Oh
Keyword(s):  
Muscle Activity ◽  
Cross Sectional Study ◽  
Pectoralis Major ◽  
Serratus Anterior ◽  
Cross Sectional ◽  
Winged Scapula ◽  
Upper Trapezius ◽  
Shoulder Muscles ◽  
Strengthening Exercises ◽  
Anterior Deltoid

Context:A winged scapula (WS) is associated with faulty posture caused by weakness of the serratus anterior (SA), which mainly acts as a scapular stabilizer muscle. It is important to accurately assess and train the SA muscle with a focus on scapula stabilizers during musculoskeletal rehabilitation of individuals with a WS.Objective:The authors examined muscle activity in the SA and pectoralis major (PM), upper trapezius (UT), and anterior deltoid (AD) as well as shoulder protraction strength during isometric shoulder protraction in individuals with and without a WS.Design:Cross-sectional study.Setting:A clinical biomechanics laboratory.Participants:In total, 27 males with no shoulder, neck, or upper-extremity pain participated.Main Outcome Measures:Isometric shoulder protraction strength was collected and surface electromyography used to measure the activity of the SA, PM, UT, and AD muscles and selective SA activity ratio to other shoulder muscles.Results:Electromyography activity of the SA muscle and shoulder protraction strength were significantly lower in individuals with a WS compared with the non-WS group (P < .05). In contrast, PM muscle activity and the PM-to-SA, UT-to-SA, and AD-to-SA ratios were significantly greater in individuals with a WS than in individuals without winging (P < .05).Conclusions:Isometric shoulder protraction for measuring SA strength in individuals with a WS should focus on isolated muscle activity of the SA, and SA strengthening exercises are important for individuals with a WS.

scholarly journals Relative Scapular-Muscle Ratios During Maximal Isokinetic Shoulder-Girdle Strength Performance in Elite Field Hockey Players

2020 ◽  
Vol 55 (3) ◽  
pp. 274-281 ◽  
Author(s):  
Fran Vanderstukken ◽  
Dorien Borms ◽  
Kelly Berckmans ◽  
Valentien Spanhove ◽  
Ann M. Cools
Keyword(s):  
Muscle Activity ◽  
External Rotation ◽  
Shoulder Girdle ◽  
Control Group ◽  
Field Hockey ◽  
Serratus Anterior ◽  
National Team ◽  
Upper Trapezius ◽  
Hockey Players ◽  
Activity Ratios

Context The shoulder joint and girdle are highly loaded during field hockey play. To optimize performance and to better substantiate preventive programs, it is important to gain insight into shoulder-girdle muscle function and balance in this athlete population. Objective To evaluate relative scapular muscle-activity ratios through surface electromyography during maximal isokinetic strength testing in elite male field hockey players compared with nonathletes. Design Cross-sectional study. Setting Institutional laboratory. Patients or Other Participants Twenty-five elite field hockey players from the Belgian National Team and 25 age- and sex-matched nonathletes. Intervention(s) We measured bilateral activity in 4 scapular muscles (upper trapezius [UT], middle trapezius [MT], lower trapezius [LT], and serratus anterior [SA]) during an external-internal rotation and protraction-retraction isokinetic shoulder protocol. Main Outcome Measure(s) Relative scapular muscle-activity ratios, or balance ratios, of the UT : MT, UT : LT, UT : SA, SA : MT, and SA : LT. Results We noted lower ratios bilaterally in the athlete group compared with the control group for the UT : MT, UT : LT, and SA : MT ratios during protraction, retraction, and external rotation, respectively, and unilaterally (dominant side only) for the UT : LT ratio during protraction. No consistent trend was present for established side differences in the studied balance ratios. Conclusions Compared with nonathletes, elite field hockey players had altered intramuscular (within the trapezius) and intermuscular (between the trapezius and SA) balance ratios during maximal shoulder-girdle contractions, with relatively more MT and LT activity. This may reflect a sport-specific adaptation to optimize coordinated activity of the scapulothoracic muscles, meeting the specific demands of field hockey movements and simultaneously better protecting the shoulder against injury. Our results can assist in optimizing high-performance training and in supporting injury-prevention programs, which are key to both successful and long-lasting athletic careers.

scholarly journals Comparison of Activity in Scapular Stabilizing Muscles during Knee Push-Up Plus and Modified Vojta’s 3-Point Support Exercises

Healthcare ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 1636
Author(s):  
Hyoungwon Lim
Keyword(s):  
Muscle Activity ◽  
Surface Emg ◽  
Emg Activity ◽  
Shoulder Injury ◽  
Serratus Anterior ◽  
Point Support ◽  
Upper Trapezius ◽  
The Difference ◽  
Lower Trapezius ◽  
Push Up

Selective serratus anterior (SA) strengthening without compensatory movement of the shoulder stabilizers is essential for shoulder stability and functional movement without causing shoulder injury and dysfunction. The purpose of this study was to compare electromyographic (EMG) activity between the SA, upper trapezius (UT), lower trapezius (LT), and pectoralis major (PM) during the knee push-up plus (KPUP) and modified Vojta’s 3-point support (MV3PS) exercises. Scapular stabilizer muscle activity (UT, LT, SA, and PM) was investigated during the KPUP and MV3PS exercises in 40 healthy adults (19 males, 21 females) using surface EMG. Muscle activity of the SA was significantly higher during the MV3PS exercise than during the KPUP (p < 0.05). However, muscle activity in the PM was significantly lower during the MV3PS exercise (p < 0.05). In addition, the LT and UT showed less muscle activity during the MV3PS exercise, although the difference was not statistically significant (p > 0.05). These findings suggest that the MV3PS exercise better activates the SA than KPUP.

scholarly journals Incorporation of the Kinetic Chain Into Shoulder-Elevation Exercises: Does It Affect Scapular Muscle Activity?

2020 ◽  
Vol 55 (4) ◽  
pp. 343-349
Author(s):  
Dorien Borms ◽  
Annelies Maenhout ◽  
Ann M Cools
Keyword(s):  
Lower Limb ◽  
Muscle Activity ◽  
Mean Difference ◽  
Hand Position ◽  
Electromyographic Activity ◽  
Kinetic Chain ◽  
Serratus Anterior ◽  
Single Plane ◽  
Rehabilitation Exercises ◽  
Shoulder Elevation

Context Scapular rehabilitation exercises should focus on selective activation of weaker muscles and minimal activation of hyperactive muscles. For rehabilitation of overhead athletes, single-plane open chain exercises below 90° of shoulder elevation are often recommended. Moreover, incorporating the kinetic chain in shoulder rehabilitation exercises is advised and has been suggested to influence scapular muscle activity levels. Objective To study the influence of kinetic chain incorporation during 5 variations of a shoulder-elevation exercise on scapular muscle activity. Design Cross-sectional study. Setting University laboratory. Patients or Other Participants Thirty-one asymptomatic participants (15 men, 16 women). Main Outcome Measure(s) The electromyographic activity of the upper (UT), middle (MT), and lower (LT) trapezius, and serratus anterior was determined during 5 variations of bilateral elevation with external rotation: (1) open-hand position (reference exercise), (2) closed-hand position, (3) dynamic bipedal squat, (4) static unipedal squat, and (5) dynamic unipedal squat on the contralateral leg. All data were normalized as a percentage of maximal voluntary isometric contraction (MVIC). Results A closed-hand position (exercise 2) instead of an open-hand position (exercise 1) resulted in lower MT (mean difference = 3.44% MVIC) and LT (mean difference = 7.76% MVIC) activity. Incorporating the lower limb (exercises 3–5) increased UT activity when compared with exercise 1 (mean differences = 3.67, 2.68, 5.02% MVIC, respectively), which in general resulted in increased UT : MT ratios. Additionally, LT activity decreased when a dynamic unipedal squat was added (mean difference: 4.90% MVIC). For the serratus anterior, the greatest activity occurred during elevation in a static unipedal squat position (exercise 4, 22.90% MVIC). Conclusions Incorporating the kinetic chain during shoulder-elevation exercises influenced scapular muscle activity and ratios. In particular, incorporating the lower limb resulted in more UT activity, whereas the open-hand position increased MT and LT activity.

Sign in / Sign up

Export Citation Format

Share Document