Tsai WC1,2, Liu WY1,3, Lien HY1, Lin YH1,4,5, Yang TF2
1Chang Gung University, School of Physical Therapy and Graduate Institute of Rehabilitation Science, College of Medicine, Taoyuan, Taiwan, 2Taipei Veterans General Hospital, Department of Physical Medicine and Rehabilitation, Taipei, Taiwan, 3Linkou Chang Gung Memorial Hospital, Department of Physical Medicine and Rehabilitation, Linkou, Taoyuan City, Taiwan, 4Chang Gung University, Healthy Aging Research Center, Taoyuan, Taiwan, 5Chiayi Chang Gung Memorial Hospital, Division of Physical Therapy, Department of Physical Medicine and Rehabilitation, Chiayi, Taiwan
Background: Children with movement disorders, such as cerebral palsy (CP), frequently demonstrated poor postural alignment, such as excessive hip adduction in sitting. The effect of changes of postural alignment of hip in the frontal plane, during anticipatory postural adjustments (APAs) are not fully explored.
Purpose: The aim of this study were to explore the effect of APAs in sitting during forward reaching tasks among three different hip frontal positions (hip neutral position, hip abduction vs. hip adduction) in children.
Methods: A cross-sectional controlled laboratory study were used. 6 Children with typical developing used their dominant hand to reach forward in order to push a target as fast as possible under three different hip frontal positions (adduction, neutral, and abduction) by random orders. The APAs were quantified by recording muscle activation using an EMG (MA300-XVI, Motion Lab Systems, Baton Rouge, LA,USA), and COP was recorded using a custom-made (60 cm×60 cm) force plate (Bertec Corporation, Columbus, OH, USA). The descriptive analyses and one-way repeated measures analysis of variance (ANOVA) will be used for statistical analyses.
Results: While sitting in the neutral condition, children first activated hip abductors, and then rectus abdominis, tibialis anterior, hip adductors prior to the initiation of posterior excursion of COP. Children activated lower their tibialis anterior (TA) during the optimal APA time window in the adduction and abduction conditions (p 0.05), compared with those in the neutral condition. In addition, children demonstrated slower onset of abductors during the adduction condition (p 0.05).
Conclusion(s): This finding of this study suggested that children with typically developing altered their APAs with the changes of their frontal postural alignments over the hip. Applied to CP children, this means that poor hip frontal plane alignment could altered their postural adjustments. In order to verify these findings, further studies recording EMG and COP of CP children need to be conducted.
Implications: Children demonstrated tight link between the initiation of focal movement and onset of distal postural muscle in the neutral condition. The results supported notion in clinical assumption the importance of good postural alignments for the optimal APAs.
Keywords: Anticipatory postural adjustments, Hip adduction and abduction, Cerebral palsy
Funding acknowledgements: The preparation of this manuscript was partially supported from the Chang Gung Medical Foundation, Taiwan, ROC (BMRP652 and CMRPD160431)
Purpose: The aim of this study were to explore the effect of APAs in sitting during forward reaching tasks among three different hip frontal positions (hip neutral position, hip abduction vs. hip adduction) in children.
Methods: A cross-sectional controlled laboratory study were used. 6 Children with typical developing used their dominant hand to reach forward in order to push a target as fast as possible under three different hip frontal positions (adduction, neutral, and abduction) by random orders. The APAs were quantified by recording muscle activation using an EMG (MA300-XVI, Motion Lab Systems, Baton Rouge, LA,USA), and COP was recorded using a custom-made (60 cm×60 cm) force plate (Bertec Corporation, Columbus, OH, USA). The descriptive analyses and one-way repeated measures analysis of variance (ANOVA) will be used for statistical analyses.
Results: While sitting in the neutral condition, children first activated hip abductors, and then rectus abdominis, tibialis anterior, hip adductors prior to the initiation of posterior excursion of COP. Children activated lower their tibialis anterior (TA) during the optimal APA time window in the adduction and abduction conditions (p 0.05), compared with those in the neutral condition. In addition, children demonstrated slower onset of abductors during the adduction condition (p 0.05).
Conclusion(s): This finding of this study suggested that children with typically developing altered their APAs with the changes of their frontal postural alignments over the hip. Applied to CP children, this means that poor hip frontal plane alignment could altered their postural adjustments. In order to verify these findings, further studies recording EMG and COP of CP children need to be conducted.
Implications: Children demonstrated tight link between the initiation of focal movement and onset of distal postural muscle in the neutral condition. The results supported notion in clinical assumption the importance of good postural alignments for the optimal APAs.
Keywords: Anticipatory postural adjustments, Hip adduction and abduction, Cerebral palsy
Funding acknowledgements: The preparation of this manuscript was partially supported from the Chang Gung Medical Foundation, Taiwan, ROC (BMRP652 and CMRPD160431)
Topic: Paediatrics
Ethics approval required: Yes
Institution: Chang Gung Medical Foundation Institution
Ethics committee: Chang Gung Medical Foundation Institutional Review Board
Ethics number: 105-6817c
All authors, affiliations and abstracts have been published as submitted.
