The reliability of postural sway measures using the 3SPACE Tracker

Area of Science:

• Biomechanics
• Human Movement Science
• Postural Control

Background:

• Electromagnetic measurement offers a novel approach to quantifying postural sway.
• Previous research has not established the reliability of this method in healthy individuals.
• Understanding postural control is crucial for assessing balance and mobility.

Purpose of the Study:

• To evaluate the reliability of 3D postural sway measures in a normal population.
• To assess the discriminatory ability of these measures across different sensory conditions.
• To validate the use of electromagnetic devices for postural analysis.

Main Methods:

• A repeated measures design was employed to assess reliability within and between sessions.
• An electromagnetic device (3SPACE Tracker) measured pelvic sway (path length, anterior-posterior, medial-lateral, vertical displacements).
• Ten healthy subjects completed postural tasks under six sensory conditions across two separate testing occasions.

Main Results:

• The 3D postural sway measures demonstrated high repeatability within and between testing sessions.
• The technique successfully discriminated between individual subjects and various sensory conditions.
• Sway path length emerged as the most consistent and reliable measure.

Conclusions:

• Three-dimensional postural sway analysis using electromagnetic devices is a reliable method.
• These measures are effective in discriminating between individuals and sensory conditions in a healthy population.
• The findings support the use of this technology for postural control assessment.