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Related Experiment Video

Updated: Jul 17, 2026

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Sit-to-stand-and-walk from 120% Knee Height: A Novel Approach to Assess Dynamic Postural Control Independent of Lead-limb

Published on: August 30, 2016

Two steps forward and one back: Learning to walk affects infants' sitting posture.

Li-Chiou Chen¹, Jason S Metcalfe, John J Jeka

¹Department of Kinesiology, University of Maryland, College Park, MD 20742-2611, USA.

Infant Behavior & Development

|February 13, 2007

Summary

Infants

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Area of Science:

Developmental neuroscience
Motor control
Human infant development

Background:

The development of upright posture is crucial for motor milestones.
Sitting is an early postural skill that is later influenced by walking.
Understanding postural development informs our knowledge of sensorimotor integration.

Purpose of the Study:

To investigate the impact of the transition to walking on sitting posture.
To determine if postural control in sitting is disrupted by the emergence of walking.
To explore the sensorimotor re-calibration processes during infant development.

Main Methods:

Longitudinal study of nine infants from sitting onset to 9 months post-walking.
Postural sway was measured using center of pressure (COP) trajectory in a sitting posture.
Infants were tested independently and with a hand-touching support condition.

Main Results:

Postural sway in sitting peaked around the onset of walking, indicating a transient disruption.
Postural sway measures were significantly higher at the walking transition age compared to other ages.
Manual contact attenuated postural sway, but only during this critical transition period.

Conclusions:

The transition to independent walking temporarily disrupts established sitting postural control.
This disruption suggests a re-calibration of the internal model for sensorimotor control of posture.
Infant postural development involves adapting existing skills to accommodate new motor behaviors like walking.