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Related Concept Videos

Muscles of the Shoulder01:23

Muscles of the Shoulder

The muscles surrounding the shoulder girdle, including the clavicle and scapula, primarily stabilize the scapula. This stable base allows other muscles to move the humerus effectively. Scapular movements often mirror those of the humerus and extend its range of motion. For instance, raising the arm above the head would not be feasible without simultaneous upward rotation of the scapula.
Anterior Thoracic Muscles
The anterior thoracic muscles include the serratus anterior, subclavius, and...

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Electromyographic analysis in patients with multidirectional shoulder instability during pull, forward punch,

Arpád Illyés1, Rita M Kiss

  • 1Orthopaedic Department, Semmelweis University, Karolina út 27., 1113, Budapest, Hungary.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|September 6, 2006
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Summary

Patients with multidirectional shoulder instability exhibit altered muscle activity patterns during arm movements. The body compensates by engaging rotator cuff muscles more while reducing deltoid, biceps, and pectoralis major activity.

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Area of Science:

  • Biomechanics
  • Musculoskeletal System

Background:

  • Multidirectional shoulder instability (MDI) affects dynamic stabilizer function and shoulder muscle activation patterns.
  • Understanding these altered patterns is crucial for developing effective rehabilitation strategies.

Purpose of the Study:

  • To compare surface electromyography (sEMG) muscle activity in patients with MDI versus healthy controls.
  • To analyze differences during specific arm movements: pull, forward punch, elevation, and overhead throw.

Main Methods:

  • Fifteen patients with MDI and fifteen healthy controls participated.
  • sEMG data were collected from eight shoulder muscles during four distinct arm movements.
  • Muscle electrical activity was quantified as % Maximum Voluntary Electrical Activity (MVE%) and analyzed for timing differences.

Main Results:

  • Patients with MDI demonstrated significantly different muscle activation patterns compared to controls.
  • Increased rotator cuff muscle activity and decreased deltoid, biceps brachii, and pectoralis major activity were observed in MDI patients.
  • Time-domain analysis revealed significantly longer time differences between normalized voluntary electrical activity peaks in MDI patients.

Conclusions:

  • The study suggests that the body attempts to stabilize the glenohumeral joint in MDI by altering muscle recruitment strategies.
  • These findings highlight the complex neuromuscular adaptations occurring in individuals with multidirectional shoulder instability.