Development of prone extension postures in healthy infants

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Published on: August 25, 2014

L Horowitz1, N Sharby

  • 1Department of Physical Therapy, Sargent College of Allied Health Professions, Boston University, MA 02215.

Physical Therapy
|January 1, 1988
PubMed

Insights

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.

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