Electromyographic analysis of posterior deltoid, posterior rotator cuff and trapezius musculature in different shoulder exercises (original) (raw)
Related papers
The shoulder external rotator muscles and the different portions of the trapezius muscle have never been studied in exclusivity. However, the literature has provided several exercises which have been used in this study. Purpose: To quantify electromyographic activity of the shoulder external rotator muscles and the upper, middle and lower trapezius in seven exercises. Methods: 20 healthy males performed 7 exercises in random order. Surface electromyography was recorded for the posterior deltoid, infraspinatus, teres minor, upper, middle and lower trapezius. Results: The four prone exercises presented the highest levels of EMG activation in the External Rotators Synergy (the average activation of arm external rotator muscles group) and in the Trapezius Synergy (the average activation of the three portions of trapezius). The infraspinatus muscle obtained the highest activation values in exercises 1 (prone horizontal abduction at 90° with full external rotation, thumb up ), 4 (prone external rotation at 90º abduction and elbow at 90º), and 5 (side-lying ER with elbow on the trunk). The highest activation level of the teres minor muscle was found in Exercise 1.
The shoulder external rotator muscles and the different portions of the trapezius muscle have never been studied in exclusivity. However, the literature has provided several exercises which have been used in this study. Purpose: To quantify electromyographic activity of the shoulder external rotator muscles and the upper, middle and lower trapezius in seven exercises. Methods: 20 healthy males performed 7 exercises in random order. Surface electromyography was recorded for the posterior deltoid, infraspinatus, teres minor, upper, middle and lower trapezius. Results: The four prone exercises presented the highest levels of EMG activation in the External Rotators Synergy (the average activation of arm external rotator muscles group) and in the Trapezius Synergy (the average activation of the three portions of trapezius). The infraspinatus muscle obtained the highest activation values in exercises 1 (prone horizontal abduction at 90° with full external rotation, thumb up ), 4 (prone external rotation at 90º abduction and elbow at 90º), and 5 (side-lying ER with elbow on the trunk). The highest activation level of the teres minor muscle was found in Exercise 1.
Journal of Orthopaedic & Sports Physical Therapy, 2004
Study Design: Prospective single-group repeated-measures design. Objectives: To quantify electromyographic (EMG) muscle activity of the infraspinatus, teres minor, supraspinatus, posterior deltoid, and middle deltoid during exercises commonly used to strengthen the shoulder external rotators. Background: Exercises to strengthen the external rotators are commonly prescribed in rehabilitation, but the amount of EMG activity of the infraspinatus, teres minor, supraspinatus, and deltoid during these exercises has not been thoroughly studied to determine which exercises would be most effective to achieve strength gains. Methods and Measures: EMG measured using intramuscular electrodes were analyzed in 10 healthy subjects during 7 shoulder exercises: prone horizontal abduction at 100°of abduction and full external rotation (ER), prone ER at 90°of abduction, standing ER at 90°of abduction, standing ER in the scapular plane (45°abduction, 30°horizontal adduction), standing ER at 0°of abduction, standing ER at 0°of abduction with a towel roll, and sidelying ER at 0°of abduction. The peak percentage of maximal voluntary isometric contraction (MVIC) for each muscle I I Please start my one-year subscription to the JOSPT. I I Please renew my one-year subscription to the JOSPT.
Journal of Strength and Conditioning Research, 2013
Schoenfeld, B, Sonmez, RGT, Kolber, MJ, Contreras, B, Harris, R, and Ozen, S. Effect of hand position on EMG activity of the posterior shoulder musculature during a horizontal abduction exercise. J Strength Cond Res 27(10): 2644-2649, 2013-The reverse fly machine is a popular exercise for strengthening the horizontal shoulder abductors including the posterior deltoid.
Electromyographic analysis: shoulder muscle activity revisited
Archives of orthopaedic and trauma surgery, 2015
Restoring optimal strength and biomechanics of a pathologic shoulder knowledge of activity patterns of healthy glenohumeral muscles is mandatory. Yet, data on normal shoulder muscle activity are not always conclusive. The study was undertaken (a) to evaluate muscle activity patterns in the healthy shoulder using surface and fine-wire electromyography (EMG), and (b) to assess method's suitability in the clinical setting especially regarding painfulness and practicability. Surface and fine-wire EMG was performed on 11 healthy subjects (2f/9m, Ø age 28 years) to assess 14 muscles including rotator cuff muscles during 8 planar standardised shoulder movements (abduction, forward flexion, internal and external rotation in neutral, 45° and 90° abduction). Pain was assessed using the visual analogue scale before testing, after inserting the fine-wire electrodes, after maximal voluntary contraction, before and after exercises, and after electrode removal. The most important finding regar...
Electromyographic Analysis of the Shoulder Girdle Musculature During External Rotation Exercises
Orthopaedic Journal of Sports Medicine, 2015
Background: Implementation of overhead activity, a key component of many professional sports, requires an effective and balanced activation of the shoulder girdle muscles, particularly during forceful external rotation (ER) motions. Purpose: To identify activation strategies of 16 shoulder girdle muscles/muscle segments during common shoulder ER exercises. Study Design: Descriptive laboratory study. Method: Thirty healthy subjects were included in this study, and 16 shoulder girdle muscles/muscle segments were investigated (surface electrode: anterior, middle, and posterior deltoid; upper, middle, and lower trapezius; serratus anterior; teres major; upper and lower latissimus dorsi; and upper and lower pectoralis major; fine wire electrodes: supraspinatus, infraspinatus, subscapularis, and rhomboid major) using a telemetric electromyography (EMG) system. Five ER exercises (standing ER at 0 and 90 of abduction, with underarm towel roll, prone ER at 90 of abduction, side-lying ER with underarm towel) were studied. Exercise EMG amplitudes were normalized to EMG at maximum ER force in a standard position. Univariate analysis of variance and post hoc analysis applied on EMG activity of each muscle were used to assess the main effect of the exercise condition. Results: Muscular activity differed significantly among the ER exercises (P < .05 to P < .001). The greatest activation for anterior and middle deltoid, supraspinatus, upper trapezius, and serratus anterior occurred during standing ER at 90 of abduction; for posterior deltoid, middle trapezius, and rhomboid during side-lying ER with underarm towel; for lower trapezius, upper and lower latissimus dorsi, subscapularis, and teres major during prone ER at 90 of abduction; and for the clavicular and sternal part of the pectoralis major during standing ER with underarm towel. Conclusion: Key glenohumeral and scapular muscles can be optimally activated during specific ER exercises, particularly in positions that stimulate athletic overhead motions. Clinical Relevance: These results enable sports medicine professionals to target specific muscles during shoulder rehabilitation protocols while minimizing the effect of others, providing a foundation for optimal evidence-based exercise prescription. They also provide information for tailored muscle training and injury prevention in overhead sports.
2021
Background and objectives: One particularly vulnerable location for increased injury is the shoulder girdle. The shoulder girdle musculature provides the upper extremity with both mobility and stability. Due to the large amount of range of motion the shoulder is predisposed to overuse injuries. In the clinical setting and in the rehabilitation literature, functional activities and exercises are commonly categorized as having weight bearing or non weight bearing characteristics. Another frequently used method of classifying movements and exercises is based on open or closed kinetic chain. The purpose of study was to compare the effects of open kinetic chain versus close kinetic chain exercises on muscle recruitment of the shoulder in healthy individuals. Method: 55 normal individuals with age ranging from 18 38 year old, who fulfilled the inclusion and exclusion criteria, were recruited by using random sampling method. EMG activity was recorded first in close kinetic chain exercise f...
Acta of Bioengineering and Biomechanics
Purpose: The purpose of the study was the assessment of the effect of cervical spine rotation on the activity of the upper (UT) and lower (LT) trapezius and serratus anterior (SA) muscles during selected shoulder movements. Methods: The investigation included 33 healthy individuals (mean age ± SD: 22 ± 1.73 years). Bioelectrical activity of the right (R) and left (L) UT, LT, SA muscles was assessed during the following movements: elevation, flexion, abduction in the scapular and right coronal planes of the dominant (right) arm accompanied by three cervical spine positions (neutral, right rotation, left rotation). Results: RLT EMG activity was higher during right shoulder abduction with right spine rotation vs. that registered during abduction without cervical spine rotation (p < 0.001). RUT EMG activity during right shoulder abduction was higher when abduction was associated with left cervical spine rotation (p < 0.01) and lower during right shoulder flexing with right cervica...
Electromyographical comparison of four common shoulder exercises in unstable and stable shoulders
Rehabilitation research and practice, 2012
This study examines if electromyographic (EMG) amplitude differences exist between patients with shoulder instability and healthy controls performing scaption, prone horizontal abduction, prone external rotation, and push-up plus shoulder rehabilitation exercises. Thirty nine subjects were categorized by a single orthopedic surgeon as having multidirectional instability (n = 10), anterior instability (n = 9), generalized laxity (n = 10), or a healthy shoulder (n = 10). Indwelling and surface electrodes were utilized to measure EMG activity (reported as a % of maximum voluntary isometric contraction (MVIC)) in various shoulder muscles during 4 common shoulder exercises. The exercises studied effectively activated the primary musculature targeted in each exercise equally among all groups. The serratus anterior generated high activity (50-80% MVIC) during a push-up plus, while the infraspinatus and teres major generated moderate-to-high activity (30-80% MVIC) during both the prone hori...