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Postural control strategies differ in normal weight and overweight infants
Danae Dinkel1, Kailey Snyder1, Victoria Molfese2
1School of Health and Kinesiology, College of Education, University of Nebraska at Omaha, 6001 Dodge Street, Omaha, NE 68182, United States.
Insights
Overweight infants exhibit distinct postural control strategies, potentially impacting early motor development. This study highlights differences in sway and entropy compared to normal-weight infants.
Area of Science:
- Pediatric motor development
- Infant biomechanics
- Childhood obesity research
Background:
- Obesity negatively influences children's motor development and postural control.
- Limited research exists on infant weight's impact on gross motor skills, especially postural control during sitting onset.
Purpose of the Study:
- To compare postural control strategies between normal-weight and overweight infants at sitting onset and one month later.
- To identify differences in motor behavior related to infant weight status.
Main Methods:
- Recruited 29 infants (19 normal weight, 10 overweight) and measured weight/length at 3 months.
- Assessed infant center of pressure (COP) using a force platform at sitting onset and one month post-onset.
- Analyzed data using linear (RMS, sway path) and nonlinear (Sample Entropy) measures of postural control.
Main Results:
- Overweight infants showed greater medial-lateral RMS and reduced sway path compared to normal-weight infants.
- Overweight infants increased Sample Entropy from sitting onset to one month later, while normal-weight infants decreased it.
Conclusions:
- Overweight infants adopt altered postural control strategies compared to normal-weight peers.
- These altered strategies may impede early developmental exploration.
- Further longitudinal research is needed to track developmental trajectories.
Background:
Evidence suggests obesity can have a negative influence on a child's motor development and postural control behavior. Little research has examined the impact of infant weight on gross motor behavior, particularly postural control at the onset of sitting.
Objective:
The purpose of this study was to determine whether normal weight and overweight infants differed in their postural control strategies at the onset of sitting and one-month post onset of sitting.
Methods:
29 infants (n=19 normal weight, n=10 overweight) were recruited to participate in this study. Infant's length and weight were measured at 3 months of age (visit 1). Infant's center of pressure (COP) was measured on an AMTI force platform at the onset of sitting (visit 2) and one-month post onset (visit 3). Data were analyzed using linear measures (range and RMS for the anterior/posterior (AP) and medial/lateral (ML) directions, sway path) and nonlinear measures (Sample Entropy in AP and ML directions).
Results:
Overweight infants had significantly greater RMS values in the ML direction at visit 2 and reduced Sway Path values in comparison to normal weight infants at visits 2 and 3. Further, there was a significant difference in Sample Entropy as overweight infants increased Sample Entropy from visit 2 to 3 while normal weight infants decreased Sample Entropy values during this time period.
Conclusions:
These findings suggest that overweight infants adopt a different postural control strategy. This altered strategy may limit exploration early in development. More research is needed to determine if longitudinal differences continue to emerge.
