Development of postural stability in children with autism spectrum disorder: a cross-sectional study.

The purpose was to investigate the effects of age on postural stability for children with autism spectrum disorder (ASD). Twenty-nine children with mild ASD were assigned into one of the three groups: 6-8 years (U8), 9-11 years (U11) and 12-14 years (U14). Participants stood barefoot with both feet on a force platform and maintained stationary for 15 seconds during eyes-open and eyes-closed conditions. Center of pressure data were collected and variables were calculated, including displacements, total distances, sway areas, and sample entropy. The variables were compared among the three groups using a mixed-model ANOVA. The age group effect was significant for mediolateral center of pressure displacement (p = 0.04) and sway distance (p = 0.02). Post-hoc comparisons revealed that U8 exhibited greater mediolateral displacement and total distance compared to U14, regardless of test conditions. The U14 group exhibited improved mediolateral postural stability compared to U8, whereas no differences were found between U8 and U11 or between U11 and U14. This may suggest that children with ASD could slowly develop postural stability but only demonstrate significant changes over a long period of time. Early intervention programs aimed to improve complexity of postural control could be beneficial.

Age-related gait development in children with autism spectrum disorder.

BACKGROUND: A better understanding of gait development and asymmetries in children with autism spectrum disorder (ASD) may improve the development of treatment programs and thus, patient outcomes. RESEARCH QUESTION: Does age affect walking kinematics and symmetry in children with ASD? METHOD: Twenty-nine children (aged 6-14 years old) with mild ASD (level one) were recruited and assigned to one of the three groups based on their ages: 6-8 years (U8), 9-11 years (U11) and 12-14 years (U14). Walking kinematics were captured using an inertia measurement unit system placed bilaterally on participants' foot, lower leg, upper leg, upper arm, pelvis, and thoracic spine. Joint angles were computed and compared among the age groups. Symmetry angles were used to assess the gait symmetry and were compared among the age groups. RESULTS: Older children exhibited less ankle dorsiflexion and knee flexion angles at heel-strike and greater plantarflexion angles at toe-off compared with younger children. In addition, a decreased pelvis and thorax axial rotation range of motion and increased shoulder flexion/extension range of motion were observed for older children. However, no age-related difference in gait symmetry was observed. SIGNIFICANCE: These findings could suggest that older children with ASD may develop gait kinematics to a more energy-efficient walking pattern.