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J Athl Train. 2005 Jun;40(2):104-110.

Isokinetic Scapular Muscle Performance in Overhead Athletes With and Without Impingement Symptoms.

Author information

1
University Hospital, Ghent, Belgium.

Abstract

CONTEXT:

Overhead activities such as throwing, tennis, or volleyball place athletes at considerable risk for overuse injuries. A relationship between scapulothoracic muscle imbalance and shoulder pain has been suggested.

OBJECTIVE:

To compare the isokinetic muscle performance of the scapular muscles between overhead athletes with impingement symptoms and uninjured overhead athletes and to identify strength deficits in the patient population.

DESIGN:

A repeated-measures analysis of variance with 1 within-subjects factor (side) and 1 between-subjects factor (group) was used to compare strength values and agonist:antagonist ratios across sides and across groups.

SETTING:

University laboratory.

PATIENTS OR OTHER PARTICIPANTS:

Thirty overhead athletes with chronic shoulder impingement symptoms and 30 overhead athletes without a history of shoulder pain.

INTERVENTION(S):

A linear protraction-retraction movement in the scapular plane at 2 velocities (12.2 cm/s and 36.6 cm/s).

MAIN OUTCOME MEASURE(S):

Isokinetic strength values and protraction:retraction ratios for both velocities.

RESULTS:

Overhead athletes with impingement symptoms showed decreased force output:body weight at both velocities in the protractor muscles on the injured side compared with the uninjured side (-13.7% at slow velocity, -15.5% at high velocity) and compared with the control group at high velocity (-20.7%). On both sides, the patient group had significantly lower protraction:retraction ratios than the control group, measured at slow velocity (nondominant = -11%, dominant = -13.7%).

CONCLUSIONS:

Overhead athletes with impingement symptoms demonstrated strength deficits and muscular imbalance in the scapular muscles compared with uninjured athletes.

PMID:
15970956
PMCID:
PMC1150223

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