scholarly journals A Comparison Study on the Electrical Activity of Arm Abduction Muscles During Shoulder Abduction and Scaption Between Shooting Disciplines

2020 ◽  
Vol 5 (4) ◽  
pp. 250-261
Author(s):  
Safoura Heshmati ◽  
◽  
Hassan Daneshmandi ◽  
Seyyed Hossein Hosseini ◽  
◽  
...  
Keyword(s):  
Electrical Activity ◽  
Surface Electromyography ◽  
Shoulder Joint ◽  
Tensile Force ◽  
Deltoid Muscle ◽  
Shoulder Abduction ◽  
Comparison Study ◽  
Significance Level ◽  
Anterior Deltoid ◽  
Air Rifle

Objective: Considering the positions that the shooter chooses during shooting in different disciplines, it seems that the activity of deltoid and supraspinatus muscles which are common muscles during movement, varies in different disciplines. Therefore, the purpose of the present study was to evaluate and compare the electrical activity of deltoid and supraspinatus muscles between three shooting disciplines. Methods: 24 shooters (8 archers, 8 air pistol shooters, and 8 air rifle shooters) participated in the study. They performed shoulder abduction and scaption at 60 and 90 degrees. The electrical activity of deltoid and supraspinatus muscles was then recorded using surface electromyography. The data were analyzed by using ANOVA and Tukey’s test at the significance level of P<0.05. Results: The activity of anterior deltoid muscle at 60 and 90 degrees of abduction and the activity of middle deltoid and supraspinatus muscles only at 90 degree of abduction was significantly higher in the archery group than in the air pistol group (P<0.05). Conclusion: The higher electrical activity of deltoid and supraspinatus muscles in archery sport may be related to the tensile force of the bow and the greater arm angle at the shoulder joint during this type of shooting compared to air pistol and air rifle shooting.

scholarly journals Surface Electromyographic Analysis of the Suprahyoid Muscles in Infants Based on Lingual Frenulum Attachment during Breastfeeding

2020 ◽  
Vol 17 (3) ◽  
pp. 859
Author(s):  
Ellia Christinne Lima França ◽  
Lucas Carvalho Aragão Albuquerque ◽  
Roberta Lopes de Castro Martinelli ◽  
Ilda Machado Fiuza Gonçalves ◽  
Cejana Baiocchi Souza ◽  
...  
Keyword(s):  
Electrical Activity ◽  
Surface Electromyography ◽  
Reference Value ◽  
Alveolar Ridge ◽  
Term Infants ◽  
Significance Level ◽  
Oral Motor ◽  
Electromyographic Analysis ◽  
Student’S T ◽  
Suprahyoid Muscle

Muscle electrical activity analysis can aid in the identification of oral motor dysfunctions, such as those resulting from an altered lingual frenulum, which consequently impairs feeding. Here, we aim to analyze the suprahyoid muscle electrical activity of infants via surface electromyography, based on lingual frenulum attachment to the sublingual aspect of the tongue and floor of the mouth during breastfeeding. In the present study, we have studied full-term infants of both genders, aged between 1 and 4 months old. The mean muscle activities were recorded in microvolts and converted into percent values of the reference value. Associations between the root mean square and independent variables were tested by one-way analysis of variance and Student’s t-test, with a significance level of 5% and test power of 95%, respectively. We evaluated 235 infants. Lower mean muscle electrical activity was observed with the lingual frenulum attached to apex/lower alveolar ridge, followed by attachment to the middle third/lower alveolar ridge, and between the middle third and apex/lower alveolar ridge. Greater suprahyoid muscle activity was observed with lingual frenulum attachment to the middle third of the tongue/sublingual caruncles, showing a coordination between swallowing, sucking, and breathing. Surface electromyography is effective in diagnosing lingual frenulum alterations, the attachment points of which raises doubt concerning the restriction of tongue mobility. Thus, it is possible to identify oral motor dysfunctions.

scholarly journals Correlation between tongue pressure and electrical activity of the suprahyoid muscles

Revista CEFAC ◽  
2017 ◽  
Vol 19 (6) ◽  
pp. 792-800 ◽  
Author(s):  
Vanessa Santiago dos Reis ◽  
Taynara Gomes de Araújo ◽  
Renata Maria Moreira Moraes Furlan ◽  
Andréa Rodrigues Motta
Keyword(s):  
Electrical Activity ◽  
Surface Electromyography ◽  
Electrical Potential ◽  
Posterior Region ◽  
Tongue Pressure ◽  
Oral Performance ◽  
Posterior Portion ◽  
Significance Level ◽  
Suprahyoid Muscles ◽  
Electrical Potentials

ABSTRACT Objective: to investigate the correlation between the tongue pressure and the electrical activity of the suprahyoid muscles. Methods: a across-sectional, observational and analytical study conducted with 15 men and 22 women. Each participant underwent simultaneous assessment of maximal tongue pressure through the Iowa Oral Performance Instrument (IOPI) and the surface electromyography of the suprahyoid muscles. They were asked to press the tongue against the hard palate in the anterior and posterior region, with and without IOPI. The adopted significance level of the performed analyses was 5%. Results: there was a moderate and significant correlation only between suprahyoid electrical activity and tongue pressure in the posterior region. It was verified that the measured electrical potentials, when using the IOPI, were greater in the tasks of anterior pressure than in the tasks of the posterior one, bilaterally. Without using the IOPI, the electrical potentials were greater in the posterior pressure than in the anterior one, bilaterally. Finally, the values of lingual pressure were compared with the bulb positioned in the anterior and posterior parts, and the anterior tongue pressure was higher. Conclusion: there was a moderate correlation between tongue pressure and electrical potential of the suprahyoid muscles, researched by the surface electromyography, only when performing activities with the posterior portion of the tongue.

NEUROMOTOR COORDINATION OF MULTISEGMENTAL MUSCLE DURING A CHANGE IN MOVEMENT DIRECTION

2006 ◽  
Vol 10 (02) ◽  
pp. 63-74 ◽  
Author(s):  
J. M. M. Brown ◽  
J. Wickham
Keyword(s):  
Shoulder Joint ◽  
Motor Task ◽  
Deltoid Muscle ◽  
Movement Direction ◽  
Shoulder Abduction ◽  
Prime Mover ◽  
Joint Rotation ◽  
Functional Roles ◽  
Inter Trial Interval ◽  
The Right

The aim of this investigation was to determine how the CNS controlled seven segments of the human deltoid muscle during a change in the direction of shoulder joint motion. Specifically, we wished to determine how the prime mover, synergist and antagonist muscle segments of this muscle were manipulated to assume new functional roles as the direction of shoulder motion was rapidly changed from shoulder abduction to shoulder adduction. Seven bipolar surface electrodes (7 mm inter-electrode distance) were placed over the seven segments (D1–D7) of the right deltoid, in seven young (19–24yrs) male subjects, to detect changes in muscle segment activation as the subjects transitioned from a rapid shoulder-abduction to a rapid-adduction force impulse (MT = 1000 ms). For each subject, fifteen trials were recorded at an inter-trial interval of 30 seconds. Comparisons of muscle segment timing and intensity of activation were made across 6 equal time intervals between just before the peak of the abduction force impulse and the subsequent peak of the adduction force impulse. The results of this study have shown that segments of the deltoid were activated during both the shoulder abduction and shoulder adduction motor task. In addition, the pattern of muscle segment activation (timing and intensity), during the transition from shoulder abduction to shoulder adduction, was dependent upon the muscle's moment arm and line of pull in relation to the axis of shoulder joint rotation. Three distinct patterns of neuromotor activation were noted within the segments of the deltoid muscle. During abduction the agonist prime mover and synergist segments (D1–D5) were totally deactivated (< 10% MVC) as they became antagonist segments during adduction. The antagonist segment (D7), during abduction, was deactivated and then reactivated as it became a synergist segment during adduction. Finally segment D6 was shown to have a nearly continuous period of activation. The study has shown that during a transition to a new movement direction, a muscle segment's line of pull and future function in the next phase of the movement appears to determine its period and intensity of activation.

scholarly journals Function, strength, and muscle activation of the shoulder complex in Crossfit practitioners with and without pain: a cross-sectional observational study

2022 ◽  
Vol 17 (1) ◽  
Author(s):  
Elisa Raulino Silva ◽  
Nicola Maffulli ◽  
Filippo Migliorini ◽  
Gilmar Moraes Santos ◽  
Fábio Sprada de Menezes ◽  
...  
Keyword(s):  
Shoulder Pain ◽  
Surface Electromyography ◽  
Shoulder Joint ◽  
Muscle Activation ◽  
National Registry ◽  
Kinetic Chain ◽  
Balance Test ◽  
Cross Sectional ◽  
Significant Difference ◽  
Lower Trapezius

Abstract Background The shoulder joint is the most commonly injured joint in CrossFit practitioners, because of the high intensity and loads associated with this sport. Despite the large number of clinical cases, there is a shortage of studies that investigate influence of biomechanical aspects of upper limbs' injuries on CrossFit practitioners. This study hypothesized that there would be a difference in function, strength, and muscle activation between Crossfit practitioners with and without shoulder pain. Methods We divided 79 Crossfit practitioners into two groups according to whether they reported pain (n = 29) or no pain (n = 50) in the shoulder during Crossfit training. Muscle function, strength, and activation were assessed using the Disability Arm, Shoulder and Hand function questionnaire, Upper Quarter Y Balance Test and Closed Kinetic Chain Upper Extremity Stability Test shoulder tests, isometric muscle strength assessment by manual dynamometry and muscle activation by surface electromyography and pain report. Results The function based on questionnaire was associated with pain (p = 0.004). We observed a statistically significant difference between the two groups only in the surface electromyography activity of the lower trapezius, and in the variables of shoulder pain and function (p = 0.038). Conclusion Crossfit practitioners with shoulder pain occurring during training showed good function and stability of the shoulder joint, but there was a reduction in the activation of stabilizing muscles, especially the lower trapezius. Trial registration Registro Brasileiro de Ensaios Clinico (Brasilian National Registry) with the ID: RBR-2gycyv.

scholarly journals Treatment of the Open Glenohumeral Joint with the Anterior Deltoid Muscle Flap

2016 ◽  
Vol 4 (10) ◽  
pp. e1068 ◽  
Author(s):  
George D. Xipoleas ◽  
Daniel Woods ◽  
Joseph Batac ◽  
Tommaso Addona
Keyword(s):  
Glenohumeral Joint ◽  
Muscle Flap ◽  
Deltoid Muscle ◽  
Anterior Deltoid

Relationship Between Deltoid and Rotator Cuff Muscles During Dynamic Shoulder Abduction: A Biomechanical Study of Rotator Cuff Tear Progression

2018 ◽  
Vol 46 (8) ◽  
pp. 1919-1926 ◽  
Author(s):  
Felix Dyrna ◽  
Neil S. Kumar ◽  
Elifho Obopilwe ◽  
Bastian Scheiderer ◽  
Brendan Comer ◽  
...  
Keyword(s):  
Rotator Cuff ◽  
Dynamic Testing ◽  
Correlation Coefficients ◽  
Biomechanical Study ◽  
Rotator Cuff Tears ◽  
Shoulder Abduction ◽  
Mean Values ◽  
Critical Shoulder Angle ◽  
Anterior Deltoid ◽  
Shoulder Angle

Background: Previous biomechanical studies regarding deltoid function during glenohumeral abduction have primarily used static testing protocols. Hypotheses: (1) Deltoid forces required for scapular plane abduction increase as simulated rotator cuff tears become larger, and (2) maximal abduction decreases despite increased deltoid forces. Study Design: Controlled laboratory study. Methods: Twelve fresh-frozen cadaveric shoulders with a mean age of 67 years (range, 64-74 years) were used. The supraspinatus and anterior, middle, and posterior deltoid tendons were attached to individual shoulder simulator actuators. Deltoid forces and maximum abduction were recorded for the following tear patterns: intact, isolated subscapularis (SSC), isolated supraspinatus (SSP), anterosuperior (SSP + SSC), posterosuperior (infraspinatus [ISP] + SSP), and massive (SSC + SSP + ISP). Optical triads tracked 3-dimensional motion during dynamic testing. Fluoroscopy and computed tomography were used to measure critical shoulder angle, acromial index, and superior humeral head migration with massive tears. Mean values for maximum glenohumeral abduction and deltoid forces were determined. Linear mixed-effects regression examined changes in motion and forces over time. Pearson product-moment correlation coefficients ( r) among deltoid forces, critical shoulder angles, and acromial indices were calculated. Results: Shoulders with an intact cuff required 193.8 N (95% CI, 125.5 to 262.1) total deltoid force to achieve 79.8° (95% CI, 66.4° to 93.2°) of maximum glenohumeral abduction. Compared with native shoulders, abduction decreased after simulated SSP (–27.2%; 95% CI, –43.3% to –11.1%, P = .04), anterosuperior (–51.5%; 95% CI, –70.2% to –32.8%, P < .01), and massive (–48.4%; 95% CI, –65.2% to –31.5%, P < .01) cuff tears. Increased total deltoid forces were required for simulated anterosuperior (+108.1%; 95% CI, 68.7% to 147.5%, P < .01) and massive (+57.2%; 95% CI, 19.6% to 94.7%, P = .05) cuff tears. Anterior deltoid forces were significantly greater in anterosuperior ( P < .01) and massive ( P = .03) tears. Middle deltoid forces were greater with anterosuperior tears ( P = .03). Posterior deltoid forces were greater with anterosuperior ( P = .02) and posterosuperior ( P = .04) tears. Anterior deltoid force was negatively correlated ( r = −0.89, P = .01) with critical shoulder angle (34.3°; 95% CI, 32.0° to 36.6°). Deltoid forces had no statistical correlation with acromial index (0.55; 95% CI, 0.48 to 0.61). Superior migration was 8.3 mm (95% CI, 5.5 to 11.1 mm) during testing of massive rotator cuff tears. Conclusion: Shoulders with rotator cuff tears require considerable compensatory deltoid function to prevent abduction motion loss. Anterosuperior tears resulted in the largest motion loss despite the greatest increase in deltoid force. Clinical Relevance: Rotator cuff tears place more strain on the deltoid to prevent abduction motion loss. Fatigue or injury to the deltoid may result in a precipitous decline in abduction, regardless of tear size.

The Efficacy of Modern Technology to Improve Healthy and Injured Shoulder Joint Position Sense

1999 ◽  
Vol 8 (1) ◽  
pp. 10-23 ◽  
Author(s):  
Semyon M. Slobounov ◽  
Shannon T. Poole ◽  
Robert F. Simon ◽  
Elena S. Slobounov ◽  
Jill A. Bush ◽  
...  
Keyword(s):  
Shoulder Joint ◽  
Healthy Subjects ◽  
Position Sense ◽  
Joint Position Sense ◽  
Modern Technology ◽  
Shoulder Abduction ◽  
Joint Position ◽  
Reproduction Task ◽  
Significant Difference ◽  
Visualization Techniques

Assessment and enhancement of joint position sense is an inexact science at best. Anew method of evaluating and improving this sense using motion-tracking technology that incorporates computer visualization graphics was examined. Injured and healthy subjects were evaluated for their abilities to determine shoulder joint position, after abduction, in two tasks. The first was active reproduction of a passively placed angle. The second was visual reproduction of such an angle. A training protocol was added to determine the effectiveness of proprioceptive training in conjunction with 3-D visualization techniques. The primary findings were (a) a significant difference (p= .05) in the level of joint position sense in injured vs. healthy subjects; (b) significantly less accurate reproduction of larger shoulder abduction vs. the smaller movement in the active reproduction task; (c) significantly greater ability to accurately reproduce angles actively vs. visually; and (d) that proprioception training using 3-D visualization techniques significantly increased activeandvisual reproductions of passively placed angles.

scholarly journals Influence of Exercise Order on Electromyographic Activity During Upper Body Resistance Training

2014 ◽  
Vol 44 (1) ◽  
pp. 203-210 ◽  
Author(s):  
Rafael Soncin ◽  
Juliana Pennone ◽  
Thiago M. Guimarães ◽  
Bruno Mezêncio ◽  
Alberto C. Amadio ◽  
...  
Keyword(s):  
Bench Press ◽  
Pectoralis Major ◽  
Upper Body ◽  
Shoulder Abduction ◽  
Electromyographic Activity ◽  
Triceps Brachii ◽  
Maximal Voluntary Isometric Contraction ◽  
Anterior Deltoid ◽  
Muscle Groups ◽  
Long Head

Abstract The purpose of this study was to investigate the effects of exercise order on electromyographic activity in different muscle groups among youth men with experience in strength training. Three sets of 8 RM were performed of each exercise in two sequences order: (a) sequence A: bench press, chest fly, shoulder press, shoulder abduction, close grip bench press and lying triceps extension; (b) sequence B: the opposite order. The electromyographic activity was analyzed in the sternocostal head of the pectoralis major, anterior deltoid, and long head triceps brachii, normalized for maximal voluntary isometric contraction. The muscles activity of the sternocostal head of the pectoralis major, anterior deltoid, and long head triceps brachii showed significant interaction between sequence and exercise. The sternocostal head of the pectoralis major showed considerably higher activity in sequence A (100.13 ± 13.56%) than sequence B (81.47 ± 13.09%) for the chest fly. The anterior deltoid showed significantly higher electromyographic activity in sequence B (86.81 ± 40.43%) than sequence A (66.15 ± 22.02%) for the chest fly, whereas for the lying triceps extension, the electromyographic activity was significantly higher in sequence A (53.89 ± 27.09%) than sequence B (34.32 ± 23.70%). For the long head triceps brachii, only the shoulder press showed differences between sequences (A = 52.43 ± 14.64 vs. B = 38.53 ± 16.26). The present study showed that the exercise order could modify the training results even though there was no alteration in volume and intensity of the exercise. These changes may result in different training adaptations.

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