Reliability, validity and normal ranges of the Zur Balance Scale for detecting mild postural control differences:...

Area of Science:

• Neuroscience
• Biomechanics
• Gerontology

Background:

• Postural stability relies on integrated vestibular, somatosensory, and visual systems.
• Existing clinical tests often neglect head movements, a key vestibular function, or require specialized equipment.
• A need exists for an accessible test evaluating these systems using head movements.

Purpose of the Study:

• To validate the Zur Balance Scale (ZBS) for assessing postural stability.
• To determine the inter- and intra-examiner reliability of the ZBS.
• To establish normal performance values for the ZBS in adults aged 29-70 and introduce a modified kinetic version (mZBS).

Main Methods:

• The study involved 251 healthy participants aged 29-70 years.
• Inter- and intra-tester reliability was assessed (n=65).
• Validity was compared against the modified clinical test of sensory interaction and balance (mCTSIB) (n=44), using kinetic measurements on a force plate.

Main Results:

• The ZBS demonstrated high inter- and intra-examiner reliability (ICC > 0.8).
• Normal ZBS scores showed a negative correlation with age, with older adults scoring lower.
• Kinetic parameters of the ZBS correlated positively with mCTSIB scores.

Conclusions:

• The Zur Balance Scale is a valid and reliable tool for postural stability assessment.
• It effectively measures postural control, including subtle differences, and incorporates essential head movements.
• Kinetic analysis allows for a modified, shorter version (mZBS), enhancing clinical applicability.