Muscle recruitment patterns of the subscapularis, serratus anterior and other shoulder girdle muscles during isokinetic internal and external rotations

2017 ◽  
Vol 36 (9) ◽  
pp. 985-993 ◽  
Author(s):  
Sylvain Gaudet ◽  
Jonathan Tremblay ◽  
Mickael Begon
Keyword(s):  
Shoulder Girdle ◽  
Muscle Recruitment ◽  
Serratus Anterior ◽  
Recruitment Patterns ◽  
Shoulder Girdle Muscles

scholarly journals Role of the kinetic chain in shoulder rehabilitation: does incorporating the trunk and lower limb into shoulder exercise regimes influence shoulder muscle recruitment patterns? Systematic review of electromyography studies

2020 ◽  
Vol 6 (1) ◽  
pp. e000683
Author(s):  
Eleanor Richardson ◽  
Jeremy S Lewis ◽  
Jo Gibson ◽  
Chris Morgan ◽  
Mark Halaki ◽  
...  
Keyword(s):  
Systematic Review ◽  
Lower Limb ◽  
Trapezius Muscle ◽  
Cochrane Central Register ◽  
Muscle Recruitment ◽  
Kinetic Chain ◽  
Serratus Anterior ◽  
Significant Difference ◽  
Recruitment Patterns ◽  
Lower Trapezius

ObjectiveTo investigate the influence of trunk and lower limb motion on electromyography (EMG) muscle activity and recruitment patterns around the shoulder.DesignSystematic review.Data sourcesMEDLINE, CINAHL, PEDro, AMED, PubMed, Cochrane Central Register of Controlled trials, Cochrane Database of Systematic reviews, SportsDiscuss and PROSPERO.Eligibility criteriaStudies investigating both multiregional kinetic chain (KC) shoulder exercises and localised non-kinetic chain (nKC) shoulder exercises in healthy subjects under the same experimental conditions were included in this review.ResultsKC exercises produced greater EMG activation levels in 5 of 11 studies for the lower trapezius. Of the remaining studies, five found no difference between the exercise types and one favoured nKC exercises. KC exercises produced greater EMG activation levels in 5 of 11 studies for the serratus anterior. Of the remaining studies, three reported the opposite and three found no significant difference between the exercise types. nKC exercises produced greater EMG activation in infraspinatus in three of four studies. KC exercises produced the lowest trapezius muscle ratios in all studies. Studies investigating the upper trapezius, middle trapezius, supraspinatus, subscapularis, biceps brachii, latifissimus dorsi, pectoralis major, deltoid, and trapezius and serratus anterior ratios showed inconsistency.ConclusionThis review found evidence that integrating the KC during shoulder rehabilitation may increase axioscapular muscle recruitment, produce lower trapezius muscle ratios and reduce the demands on the rotator cuff. Stepping appears preferable to squatting.PROSPERO registration numberCRD42015032557, 2015.

scholarly journals Analysis of muscle activity during the bench press exercise performed with the pre-activation method on stable and unstable surfaces

Kinesiology ◽  
2017 ◽  
Vol 49 (2) ◽  
pp. 161-168 ◽  
Author(s):  
André Luiz Torres Pirauá ◽  
Natália Barros Beltrão
Keyword(s):  
Repeated Measures ◽  
Bench Press ◽  
Body Height ◽  
Training Session ◽  
Shoulder Girdle ◽  
Activation Method ◽  
Emg Activity ◽  
Triceps Brachii ◽  
Serratus Anterior ◽  
Shoulder Girdle Muscles

This study compared the EMG activity of the upper limb and shoulder girdle muscles in a resistance training session involving the pre-activation method in stable and unstable conditions. Fourteen healthy male volunteers (age 22.5±2.4 years; body height 173.6±7.10 cm; body mass 76.03±9.02 kg) performed under three exercise conditions in a randomized order: a) barbell bench press, b) stable dumbbell fly and barbell bench press, and c) unstable dumbbell fly and barbell bench press. Subjects performed 10 repetitions of stable or unstable dumbbell fly at 30% of 1RM, and barbell bench press was executed at 60% of 1RM until concentric failure. The 1RM test was performed in both exercises and, on the case of dumbbell fly, on both surfaces. EMG-signals from the pectoralis maior (PM), deltoid anterior (DA), triceps brachii (TB) and serratus anterior (SA) were acquired. Two-way ANOVA for repeated measures indicated that the pre-activation method performed in both surfaces raised the EMG activity for all muscles: PM (p≤0.01), DA (p≤0.02), TB (p≤0.02) and SA (p≤0.03), and no differences were observed between stable and unstable conditions (p≥0.228). These results indicate that the execution of a previous exercise increases EMG activity. However, as there was no exclusive increase for primary agonist muscles, this increase cannot be attributed to the pre-activation method, but rather to the completion of two consecutive exercises.

scholarly journals Survey of isometric scapulothoracic muscles strength in Mazandaran University of Science and Technology athlete’s student

2019 ◽  
Vol 23 (3) ◽  
pp. 112-119
Author(s):  
M. Forghani Ozrudi
Keyword(s):  
Student Athletes ◽  
Rank Order ◽  
Shoulder Girdle ◽  
Correction Method ◽  
Activity Level ◽  
Serratus Anterior ◽  
Shoulder Dysfunction ◽  
Shoulder Girdle Muscles ◽  
Lower Trapezius ◽  
Extremity Motion

Purpose: Shoulder girdle muscles are important for stabilizing the scapula and orienting the glenoid for upper-extremity motion in student athletes. Scapular strength deficits have been linked to shoulder dysfunction. Material: study the data of scapulothoracic musculature in student athletes using a handheld dynamometer. Cohort study. 66 subjects with varying levels of overhead activity. A handheld dynamometer was used to test the upper, middle, and lower trapezius, rhomboids, and serratus anterior. A one way-factor ANOVA was performed for each of the muscles by activity level analyses. 2-factor ANOVA was performed for each of the muscles by activity level and unilateral ratio by activity-level analyses. Post hoc analysis included multiple pairwise comparisons, using the Dunn-Bonferroni correction method. Results: Activity level did not significantly affect the unilateral ratios: Elevation: depression was 2.47:1, upward: downward rotation was 1.23:1, and protraction: retraction was 2.35:1. A rank order from strongest to weakest was established through significant comparisons. Conclusions: The unilateral ratios along with the rank order should be considered when discussing scapula rehabilitation protocols. Assessment of the upper and lower trapezius and serratus anterior muscles and should be part of any shoulder examination.

Dystrophinopathies and Limb-Girdle Muscular Dystrophies

2017 ◽  
Vol 48 (04) ◽  
pp. 262-272 ◽  
Author(s):  
Anna Sarkozy ◽  
Mariacristina Scoto ◽  
Francesco Muntoni ◽  
Joana Domingos
Keyword(s):  
Clinical Trials ◽  
Treatment Options ◽  
Shoulder Girdle ◽  
Muscle Disease ◽  
Standards Of Care ◽  
Muscular Dystrophies ◽  
New Treatment ◽  
Shoulder Girdle Muscles ◽  
Independent Ambulation ◽  
Duchenne's Muscular Dystrophy

AbstractMuscular dystrophies are a heterogeneous group of inherited diseases. The natural history of these disorders along with their management have changed mainly due to a better understanding of their pathophysiology, the evolution of standards of care, and new treatment options. Dystrophinopathies include both Duchenne's and Becker's muscular dystrophies, but in reality they are a spectrum of muscle diseases caused by mutations in the gene that encodes the protein dystrophin. Duchenne's muscular dystrophy is the most common form of inherited muscle disease of childhood. The current standards of care considerably prolong independent ambulation and survival. Several therapeutic options either aiming at substituting/correcting the primary protein defect or limiting the progression of the dystrophic process are currently being explored in clinical trials.Limb-girdle muscular dystrophies (LGMDs) are rare and heterogeneous conditions, characterized by weakness and wasting of the pelvic and shoulder girdle muscles. Originally classified into dominant and recessive, > 30 genetic forms of LGMDs are currently recognized. Further understanding of the pathogenic mechanisms of LGMD will help identifying novel therapeutic approaches that can be tested in clinical trials.

scholarly journals Age-Related, Sport-Specific Adaptions of the Shoulder Girdle in Elite Adolescent Tennis Players

2014 ◽  
Vol 49 (5) ◽  
pp. 647-653 ◽  
Author(s):  
Ann M. Cools ◽  
Tanneke Palmans ◽  
Fredrik R. Johansson
Keyword(s):  
Muscle Strength ◽  
Shoulder Girdle ◽  
Vital Role ◽  
The Body ◽  
Injury Incidence ◽  
Shoulder Injury ◽  
Serratus Anterior ◽  
Cross Sectional ◽  
Tennis Players ◽  
Age Related

Context Tennis requires repetitive overhead movements that can lead to upper extremity injury. The scapula and the shoulder play a vital role in injury-free playing. Scapular dysfunction and glenohumeral changes in strength and range of motion (ROM) have been associated with shoulder injury in the overhead athlete. Objective To compare scapular position and strength and shoulder ROM and strength between Swedish elite tennis players of 3 age categories (<14, 14–16, and >16 years). Design Cross-sectional study. Setting Tennis training sports facilities. Patients or Other Participants Fifty-nine adolescent Swedish elite tennis players (ages 10–20 years) selected based on their national ranking. Main Outcome Measure(s) We used a clinical screening protocol with a digital inclinometer and a handheld dynamometer to measure scapular upward rotation at several angles of arm elevation, isometric scapular muscle strength, glenohumeral ROM, and isometric rotator cuff strength. Results Players older than 16 years showed less scapular upward rotation on the dominant side at 90° and 180° (P < .05). Although all absolute scapular muscle strength values increased with age, there was no change in the body-weight–normalized strength of the middle (P = .9) and lower (P = .81) trapezius or serratus anterior (P = .17). Glenohumeral internal-rotation ROM and total ROM tended to decrease, but this finding was not statistically significant (P = .052 and P = .06, respectively). Whereas normalized internal-rotator strength increased from 14 to 16 years to older than 16 years (P = .009), normalized external-rotator and supraspinatus strength remained unchanged. Conclusions Age-related changes in shoulder and scapular strength and ROM were apparent in elite adolescent tennis players. Future authors should examine the association of these adaptations with performance data and injury incidence.

scholarly journals Electromyographic Evaluation of the Shoulder Muscle after a Fatiguing Isokinetic Protocol in Recreational Overhead Athletes

2021 ◽  
Vol 18 (5) ◽  
pp. 2516
Author(s):  
Sebastian Klich ◽  
Adam Kawczyński ◽  
Bogdan Pietraszewski ◽  
Matteo Zago ◽  
Aiguo Chen ◽  
...  
Keyword(s):  
External Rotation ◽  
Shoulder Girdle ◽  
Median Frequency ◽  
Shoulder Injury ◽  
Overhead Athletes ◽  
Upper Trapezius ◽  
Main Effect ◽  
Shoulder Girdle Muscles ◽  
Exercise Induced ◽  
The Right

The goal of our study was to examine the muscle activity of the shoulder girdle after isokinetic fatigue, which may simulate muscle activities commonly occurring during specific sport-related activities in recreational overhead asymptomatic athletes. We hypothesized that exercise-induced fatigue, reported after isokinetic protocols, may cause a decrease in the median frequency (MF) of the upper trapezius (UT), infraspinatus (IS), and deltoid muscles. Twenty-four male overhead volleyball (n = 8), handball (n = 8), and tennis (n = 8) athletes participated in this study. All subjects were without shoulder injury history. The surface electromyography (SEMG) was collected on the right (dominant) side of the shoulder girdle muscles in the following order: UT, IS and anterior (DA), and posterior deltoideus (DP). The fatigue protocol consisted of three sets of 32 maximum isokinetic concentric contractions while performing shoulder internal and external rotation at an isokinetic speed of 120 o/s. The resultant difference in median frequency (ΔMF) values consistently dropped after the fatiguing tasks across all recorded muscles, in terms of the initial MF (MFINI = 65.1 ± 1.1 Hz) and final MF (MFFIN = 57.9 ± 0.9 Hz), and the main effect of time was significant (F(1,22) = 43.15, p < 0.001). MF values decreased mostly for IS (ΔMFIS = −9.9 ± 1.6 Hz) and DP (ΔMFPD = −9.5 ± 1.9 Hz) muscles, while DA and UT showed smaller changes (ΔMFDA = −6.9 ± 1.5 Hz) and (ΔMFUT = −3.2 ± 1.3 Hz). The results of our study show a meaningful contribution in determining increased fatigue of the shoulder girdle muscles during repeated isokinetic internal-external rotation protocols. We have also demonstrated a significant decrease in MF in all examined muscles, especially IS and DA.

FEATURES OF THE DEVELOPMENT OF THE MAIN MUSCLES SHOULDER GIRDLE OF THE AXIAL DEPARTMENT YOUNG SHEEP OF THE QIGAI BREED

2020 ◽  
pp. 56-58
Author(s):  
V.I. KOSILOV ◽  
Keyword(s):  
Growth And Development ◽  
Physiological State ◽  
Shoulder Girdle ◽  
Axial Section ◽  
Shoulder Girdle Muscles

The article presents the results of studying the growth and development of the shoulder girdle muscles of the axial section of young sheep of the qigai breed, depending on the gender and physiological state.

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