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Acquirement of stability and mobility in infant gait
Naoko Yaguramaki1, Tasuku Kimura
1Graduate School of Science, University of Tokyo, Tokyo, Japan. naoy@fk9.so-net.ne.jp
Insights
Infant gait development shows significant improvements in walking stability and joint mobility within months of first steps. Lateral stability emerges as the primary driver, preceding refined mobility in developing infants.
Area of Science:
- Developmental biology
- Biomechanics
- Pediatrics
Background:
- Gait development in infants is a complex process involving motor control and biomechanical changes.
- Understanding the sequence and contributing factors to early walking is crucial for identifying developmental milestones.
Purpose of the Study:
- To investigate the developmental trajectory of gait stability and mobility in infants.
- To determine the relative importance of lateral stability versus joint mobility in early walking.
Main Methods:
- Longitudinal and cross-sectional study design.
- Analysis of 35 infants aged 7-70 months.
- Estimation of walking stability via mediolateral body segment motion and mobility via joint angular displacement.
Main Results:
- Significant decreases in shoulder, hip, knee, and ankle motion observed post-onset of walking.
- Distal segments showed the earliest and most significant motion reduction.
- Trunk-thigh and thigh-shank angles exhibited significant changes up to 9 months post-walking onset.
Conclusions:
- Lateral stability is a critical early component of infant gait development, preceding the refinement of mobility.
- Gait development progresses from proximal to distal segments, with initial stability gains being paramount.
Abstract:
We examined gait development in a longitudinal and cross-sectional study in 35 infants, age range 7-70 months. We estimated walking stability from mediolateral motion of body segments and mobility from the angular displacement of joints. Motion at the shoulder, hip, knee and ankle decreased significantly over several months after the onset of walking and thereafter changed gradually. The remarkable decrease began distally. The trunk-thigh and thigh-shank angles changed significantly until 9 months after the onset of walking. These results indicate that lateral stability, which develops earlier than mobility, is the most important factor in gait development in infants.