يکشنبه 25 آذر 1397
به سایت مجله پزشکی دانشگاه علوم پزشکی و خدمات بهداشتی و درمانی تبریز خوش آمدید
   ديسمبر 16, 2018
   
   
     
  تعداد اعضاء : 3193 نفر
  بازدیدهای امروز :424 بار
  تعداد کل بازدیدها : 276761 بار
   
Volume: 40
Year: 2018
Month: 9
Subject Others
Title Electromyographical activity of different sections of deltoid and supraspinatus muscles during dynamic abduction of upper limb in various speeds and loading in healthy adolescent subjects
Authors Soghra Abbasi; Nader Farahpou; Farid Bahrpeima;
Abstract Background: Understanding of shoulder muscles function in various dynamic tasks is effective to understand the underlying mechanism of the shoulder injuries in sport activities. The aim of this study was to identify the electrical activity of deltoid and supraspinatus muscles during the fast and slow shoulder abduction with and without an external load in healthy adolescent subjects. Methods: In 16 females (20-28 years old), using a surface EMG system (MA-300), the activity of deltoid (anterior, medial, and posterior portions), and supraspinatus muscles within 90º of shoulder abduction in slow (22.5 º /s) and fast (45 º /s) movements that were repeated with and without a dumbbell (equal to 5% of body mass) were registration. Repeated Measure ANOVA was used with SPSS-22 for statistics analysis having p≤0.05. Results: In slow without load abduction, the intensity of the activity of anterior, medial, and posterior deltoid and supraspinatus Muscles were %18.22±1.92, %50.55±1.97, %50.60±17.50 and %39.49±3.78, microvolt respectively. In with and without load conditions, the posterior and middle deltoid muscles displayed significantly greater activity than the other muscles. Load factor significantly increased the muscle activity by1.19 times (P=0.0001). However, loading effect was greater in posterior deltoid than in other muscles. Speed factor displayed similar effect in all muscles. Conclusion: The cause of the higher activity of posterior deltoid than anterior deltoid could be specified by the mechanism of external rotation of the humerus during shoulder abduction. The strengthening of posterior deltoid should be noteworthy in rehabilitation shoulder exercises.
Keywords: Electromyography, Shoulder joint, Abduction, Deltoid, Supraspinatus
Download Download
 
     
     
 
ISSN 1608-5671 (Print)  

ISSN 2008-160X (Online)  
 
     
     
 

ضريب تأثير (IF) مجله پزشکی دانشگاه علوم پزشکی تبریز  در  پايگاه  استنادي علوم جهان اسلام (ISC)  

هیأت اجرایی

بانک ها و نمایه نامه ها