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Measuring Eccentric Strength of the Shoulder External Rotators Using a Handheld Dynamometer: Reliability and

Fredrik R Johansson1,2,3, Eva Skillgate2,3, Mattis L Lapauw1

  • 1Department of Rehabilitation Sciences and Physiotherapy, Faculty of Medicine and Health Sciences, Ghent University Hospital, Belgium;

Journal of Athletic Training
|May 15, 2015
PubMed
Summary

This study demonstrates that a handheld dynamometer (HHD) offers reliable and valid measurements for eccentric shoulder strength, crucial for injury prevention and rehabilitation protocols.

Keywords:
eccentric testinginjury preventionrehabilitationupper extremity

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Area of Science:

  • Biomechanics
  • Sports Medicine
  • Physical Therapy

Background:

  • Shoulder strength assessment is vital for clinical evaluation.
  • Eccentric strength measurements are particularly important for injury prevention and return-to-play decisions.

Purpose of the Study:

  • To evaluate the reliability and validity of a standardized eccentric strength measurement protocol for glenohumeral external rotators.

Main Methods:

  • A descriptive laboratory study involving 25 healthy participants.
  • Eccentric strength was measured using a handheld dynamometer (HHD) and isokinetic testing.
  • Intratester and intertester reliability and validity against isokinetic data were assessed.

Main Results:

  • Excellent intratester reliability (ICC 0.858-0.879) and good intertester reliability (ICC 0.714) were found for HHD measurements.
  • Good validity was demonstrated with high correlations (r=0.70-0.78) between HHD and isokinetic data.
  • The protocol showed strong reliability and validity for eccentric rotator cuff strength assessment.

Conclusions:

  • A standardized eccentric rotator cuff strength test using an HHD is reliable and valid for clinical use.
  • This method supports informed decisions regarding injury prevention and rehabilitation.
  • The HHD provides a practical tool for assessing eccentric shoulder strength in clinical settings.