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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
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Does a tackling task effect shoulder joint position sense in rugby players?

Lee Herrington1, Ian Horsley, Lindsey Whitaker

  • 1Directorate of Sport, University of Salford, Manchester M66PU, UK. l.c.herrington@salford.ac.uk

Physical Therapy in Sport : Official Journal of the Association of Chartered Physiotherapists in Sports Medicine
|December 17, 2008
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Summary

A simulated tackling task significantly reduced shoulder joint position sense (JPS) in rugby players, particularly at the end of the range of motion. This impairment in JPS may increase the risk of shoulder injuries in athletes.

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Area of Science:

  • Sports Medicine
  • Biomechanics
  • Motor Control

Background:

  • Shoulder joint position sense (JPS) is crucial for dynamic joint stability.
  • Rugby involves repetitive, high-impact tackling, potentially affecting shoulder proprioception.
  • Understanding JPS changes post-fatigue is vital for injury prevention in contact sports.

Purpose of the Study:

  • To evaluate the impact of a simulated tackling task on shoulder JPS in professional rugby players.
  • To compare JPS at mid-range versus end-of-range shoulder positions.
  • To determine if the tackling task induced angle-specific deficits in JPS.

Main Methods:

  • Repeated measures design in a university human performance laboratory.
  • Twenty-two asymptomatic professional rugby union players participated.
  • Shoulder JPS was measured at 45 and 80 degrees of external rotation before and after a simulated tackling task.

Main Results:

  • Pre-tackling, JPS was poorer at 45 degrees compared to 80 degrees external rotation.
  • Post-tackling, JPS significantly worsened at 80 degrees external rotation.
  • No significant change in JPS was observed at 45 degrees post-tackling.

Conclusions:

  • A fatiguing tackling task significantly impairs shoulder JPS, especially at end-range positions.
  • Reduced JPS may compromise the ability to detect anterior structure stress, increasing injury risk.
  • These sensorimotor deficits following tackling may contribute to glenohumeral joint micro-instability and overuse injuries in rugby.