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This study validates a new dynamometer for measuring hip abductor muscle strength. The supine position with allometric normalization offers the most reliable results for assessing isometric strength.

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Area of Science:

  • Biomechanics and Musculoskeletal Health
  • Exercise Physiology and Sports Science

Background:

  • Hip abductor muscles are crucial for pelvic stability and functional movement.
  • Deficits in hip abductor strength can lead to functional impairments.
  • Accurate measurement of isometric hip abductor strength is essential for clinical and research applications.

Purpose of the Study:

  • To determine the validity and reliability of three measurement protocols for isometric hip abductor muscle strength.
  • To evaluate a novel functional electromechanical dynamometer for strength assessment.
  • To compare different data normalization methods for objective strength evaluation.

Main Methods:

  • Isometric strength of hip abductor muscles was measured using a new functional electromechanical dynamometer.
  • Strength was assessed in three positions: side-lying, standing, and supine.
  • Peak force data were normalized using body mass, fat-free mass, and an allometric technique across two sessions.

Main Results:

  • The side-lying position yielded higher peak force (30% and 27% greater than standing and supine, respectively), irrespective of normalization.
  • High correlations (r: 0.72–0.98) were observed between measurement protocols.
  • The supine position with allometric normalization demonstrated superior test-retest reliability (ICC: 0.94, CV: 5.64%).

Conclusions:

  • The functional electromechanical dynamometer is a valid tool for assessing isometric hip abductor strength.
  • All three tested positions are reliable for strength measurement.
  • Supine position with allometric data normalization provides the most reliable outcomes for hip abductor strength assessment.