Age-related changes in postural control: rambling and trembling trajectories

Area of Science:

• Biomechanics
• Human motor control
• Developmental pediatrics

Background:

• Postural control is crucial for maintaining balance during upright stance.
• Understanding age-related changes in postural control is vital for child development.
• Rambling and trembling quantify different aspects of postural sway.

Purpose of the Study:

• To identify and quantify the rambling and trembling properties of the postural control system in children aged 4-12 years.
• To investigate age-related differences in postural sway characteristics between children and adults.
• To differentiate the contributions of sensory integration difficulties versus postural noise to sway in young children.

Main Methods:

• Forty-five children (4, 8, 12 years) and 15 adults performed 30-second upright stance trials on a force plate.
• Trials were conducted with and without visual input.
• Center of pressure (COP) data were analyzed for rambling, trembling, sway amplitude, and frequency.

Main Results:

• Center of pressure displacement and rambling trajectories showed age-related increases in sway with age.
• Younger children exhibited larger trembling trajectories compared to older children and adults.
• Body sway was significantly greater in younger children than in older children and adults.

Conclusions:

• Increased body sway in younger children is primarily linked to difficulties in using sensory information for spatial estimation.
• Challenges in integrating sensory feedback, rather than increased noise in the postural control system, explain greater sway in young children.
• Findings highlight the developmental trajectory of sensory-motor integration in maintaining upright stability.