Evaluation of trunk stability in the sitting position using a new device

Area of Science:

• Biomechanics
• Gerontology
• Human Movement Science

Background:

• Assessing trunk stability is crucial for understanding balance and fall risk, particularly in the elderly.
• Existing methods may not isolate trunk control from lower limb contributions.
• Dynamic trunk stability is essential for maintaining posture during daily activities.

Purpose of the Study:

• To evaluate and quantify dynamic trunk stability in seated elderly and young individuals.
• To introduce and validate a novel device for measuring trunk stability.
• To investigate age-related differences in trunk stability using the new device.

Main Methods:

• A new device was developed to incline a seat and track the center of pressure (CoP).
• Measurements included CoP locus, locus length, enveloped area, and locus length per unit area (LNG/AREA).
• Participants included both young and elderly individuals performing seated postural tasks.

Main Results:

• The new device effectively measured trunk stability, isolating it from lower extremity influence.
• Locus length per unit area (LNG/AREA), reflecting spinal proprioceptive reflexes, showed no significant difference between age groups.
• This indicates that the device can quantify dynamic trunk stability independent of lower limb sway.

Conclusions:

• The novel device reliably quantifies dynamic trunk stability in seated individuals.
• The findings suggest that spinal proprioceptive reflexes contributing to trunk stability do not significantly differ between young and elderly adults.
• This technology has potential applications in geriatric care and rehabilitation for assessing balance and fall prevention strategies.