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Development of prone extension postures in healthy infants
1Department of Physical Therapy, Sargent College of Allied Health Professions, Boston University, MA 02215.
Physical Therapy
|January 1, 1988
Summary
Infant motor development shows a distinct sequence for prone extension: head, then lower limbs, then upper limbs. Upper limb extension isn't needed for later prone postures, suggesting varied motor control strategies.
Area of Science:
- Pediatric Physical Therapy
- Infant Motor Development
- Neurodevelopmental Pediatrics
Background:
- Understanding typical infant motor development is crucial for identifying deviations and planning interventions.
- The prone extension posture is a key milestone in assessing gross motor skills in infants.
- Existing research has not fully elucidated the specific sequence of limb extension within the prone extension posture.
Purpose of the Study:
- To investigate the developmental sequence of head, upper extremity, and lower extremity extension in the prone extension posture.
- To identify variations in this developmental sequence among healthy infants.
- To compare the prone extension posture sequence with the development of prone-on-elbows and prone-on-hands postures.
Main Methods:
- Longitudinal observation of 16 healthy, full-term infants from 8 to 28 weeks of age.
- Systematic recording of the emergence and sequence of head, upper extremity, and lower extremity extension in the prone position.
- Comparative analysis with the onset of prone-on-elbows and prone-on-hands postures.
Main Results:
- The typical sequence observed was head extension, followed by lower extremity extension, and then upper extremity extension.
- Upper extremity extension in the prone extension posture was not found to be a prerequisite for developing prone-on-elbows or prone-on-hands postures.
- Significant individual variations in the timing and presence of specific components of the prone extension posture were noted.
Conclusions:
- Infant motor development in the prone extension posture follows a predictable cephalocaudal and proximal-to-distal sequence for head and lower extremities, but upper extremity development may follow different strategies.
- The findings suggest distinct developmental pathways for motor control in different body segments.
- This research provides valuable data for pediatric physical therapists in assessing and intervening in infant motor development, particularly concerning gross motor skills.