Nonlinear analysis of sitting postural sway indicates developmental delay in infants

Postural Complexity Influences Development in Infants Born Preterm With Brain Injury: Relating Perception-Action Theory to 3 Cases

“…9 Limited early postural complexity has been associated with atypical or delayed development. 16,17 Infants diagnosed with or at risk for cerebral palsy demonstrated more repetitive (less complex) postural sway strategies in the early stages of sitting. 16 Infants born preterm used more repetitive postural sway patterns at an adjusted age (AA; ie, chronological age minus weeks preterm) of 1 to 3 weeks and demonstrated less adaptive postural control strategies while learning to control their head in the midline position and during a reaching task.…”

“…16,17 Infants diagnosed with or at risk for cerebral palsy demonstrated more repetitive (less complex) postural sway strategies in the early stages of sitting. 16 Infants born preterm used more repetitive postural sway patterns at an adjusted age (AA; ie, chronological age minus weeks preterm) of 1 to 3 weeks and demonstrated less adaptive postural control strategies while learning to control their head in the midline position and during a reaching task. 17,18 Evidence on the role of postural complexity in optimal health, early development, and developmental disabilities suggests that alterations in postural complexity may be predictors of disability.…”

“…17,18 Evidence on the role of postural complexity in optimal health, early development, and developmental disabilities suggests that alterations in postural complexity may be predictors of disability. 16,19 A better understanding of the role of postural complexity in the prediction of disability may support the identification of clinically useful tools for predicting motor disability. 20,21 In this case series, we examined the relationship between altered postural complexity and development in infants who were at high risk for motor delay and considered how the findings relate to the perceptionaction theory.…”

Longitudinal changes in muscle activity during infants' treadmill stepping

“…Only through longitudinal work can the changes in behavior at different points in time and their variability be confidently attributed to development, rather than differences among samples selected for the specific study at each age. Infants with motor disabilities generally produce much greater variability in performance around their group means and in their developmental trajectories than do healthy infants (Deffeyes et al 2009;Ulrich and Ulrich 1995;van Haastert et al 2006). Thus closer examination of the underlying control of treadmill stepping, reflected in electromyographic (EMG) activity, across the range of behavioral responses (good steppers and poor steppers) for a randomly selected sample of healthy infants will enhance our understanding of normal variations across infancy.…”

CareToy: Stimulation and Assessment of Preterm Infant’s Activity Using a Novel Sensorized System

“…13,20 COP movement is assessed based on the pressure imprint data, which are sampled with 30 Hz. First, pressure imprint data are pre-processed with bias and superposed noise removal methods.…”