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Home / Equine Research Bank / Exp Brain Res / Trunk postural reactions to the force perturbation intensity...
Experimental brain research2023; doi: 10.1007/s00221-023-06744-0

Trunk postural reactions to the force perturbation intensity and frequency during sitting astride in children with cerebral palsy.

Abstract: The purpose of this study was to examine kinematic and neuromuscular responses of the head and body to pelvis perturbations with different intensities and frequencies during sitting astride in children with CP. Sixteen children with spastic CP (mean age 7.4 ± 2.4 years old) were recruited in this study. A custom designed cable-driven robotic horse was used to apply controlled force perturbations to the pelvis during sitting astride. Each participant was tested in four force intensity conditions (i.e., 10%, 15%, 20%, and 25% of body weight (BW), frequency = 1 Hz), and six force frequency conditions (i.e., 0.5 Hz, 1 Hz, 1.5 Hz, 2 Hz, 2.5 Hz, and 3 Hz, intensity = 20% of BW). Each testing session lasted for one minute with a one-minute rest break inserted between two sessions. Kinematic data of the head, trunk, and legs were recorded using wearable sensors, and EMG signals of neck, trunk, and leg muscles were recorded. Children with CP showed direction-specific trunk and neck muscle activity in response to the pelvis perturbations during sitting astride. Greater EMG activities of trunk and neck muscles were observed for the greater intensities of force perturbations (P < .05). Participants also showed enhanced activation of antagonistic muscles rather than direction-specific trunk and neck muscle activities for the conditions of higher frequency perturbations (P < .05). Children with CP may modulate trunk and neck muscle activities in response to greater changes in intensity of pelvis perturbation during sitting astride. Perturbations with too high frequency may be less effective in inducing direction-specific trunk and neck muscle activities.
© 2023. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
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Publication Date: 2023-11-28 PubMed ID: 38015245PubMed Central: 5303755DOI: 10.1007/s00221-023-06744-0Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

This research focuses on studying the trunk postural reactions in children with cerebral palsy during varying intensity and frequency forces applied to the pelvis during a sitting astride position.

Overview of the Study

  • The study was targeted to analyze the kinematic and neuromuscular responses of the head and body to forces applied to the pelvis during a specific posture (sitting astride) in children with spastic cerebral palsy (CP).
  • The participants of this study were sixteen children with spastic CP with an average age of 7.4 ± 2.4 years old.
  • The research utilized a cable-driven robotic horse specifically designed for this study to apply controlled force perturbations to the pelvis.

Research Methodology

  • Participants were subjected to trials with varying force intensity conditions and frequency conditions. Force intensity conditions were set at 10, 15, 20, and 25% of the child’s body weight at a frequency of 1Hz. Frequency conditions were set at 0.5Hz, 1Hz, 1.5Hz, 2Hz, 2.5Hz, and 3Hz, with an intensity of 20% of child’s body weight.
  • Each testing session lasted for one minute and was interspersed with a one-minute rest break between two sessions.
  • Data on the kinematics of the head, trunk, and legs were recorded using wearable sensors, while electromyographical (EMG) signals of muscles in the neck, trunk, and legs were also recorded.

Findings of the Study

  • The study found that the participants exhibited direction-specific trunk and neck muscle activity in response to the varying pelvis perturbations during the sitting astride position.
  • Greater EMG activities of the trunk and neck muscles were noted when greater intensity force perturbations were applied.
  • For higher frequency force perturbations, the participants showed increased activation of antagonistic muscles as opposed to exhibiting direction-specific trunk and neck muscle activities.

Implications of the Study

  • The findings of the study suggest that children with CP can modulate trunk and neck muscle activities in reaction to greater changes in the intensity of force perturbations applied to the pelvis during sitting astride.
  • The study implies that perturbations with excessively high frequency may not be effective enough in inducing direction-specific trunk and neck muscle activities.

Cite This Article

APA
Yan S, Park SH, Dee W, Keefer R, Rojas AM, Rymer WZ, Wu M. (2023). Trunk postural reactions to the force perturbation intensity and frequency during sitting astride in children with cerebral palsy. Exp Brain Res. https://doi.org/10.1007/s00221-023-06744-0

Publication

Experimental brain research
ISSN: 1432-1106
NlmUniqueID: 0043312
Country: Germany
Language: English

Researcher Affiliations

Yan, Shijun
  • Legs and Walking Lab, Shirley Ryan AbilityLab, 355 E. Erie Street, 23Rd Floor, Chicago, IL, 60611, USA.
  • Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL, USA.
Park, Seoung Hoon
  • Legs and Walking Lab, Shirley Ryan AbilityLab, 355 E. Erie Street, 23Rd Floor, Chicago, IL, 60611, USA.
  • Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL, USA.
  • Department of Health and Human Performance, Department of Communication Sciences and Disorders, Department of Clinical Sciences, University of Houston, Houston, TX, USA.
Dee, Weena
  • Legs and Walking Lab, Shirley Ryan AbilityLab, 355 E. Erie Street, 23Rd Floor, Chicago, IL, 60611, USA.
Keefer, Renee
  • Legs and Walking Lab, Shirley Ryan AbilityLab, 355 E. Erie Street, 23Rd Floor, Chicago, IL, 60611, USA.
Rojas, Ana-Marie
  • Legs and Walking Lab, Shirley Ryan AbilityLab, 355 E. Erie Street, 23Rd Floor, Chicago, IL, 60611, USA.
  • Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL, USA.
Rymer, William Zev
  • Legs and Walking Lab, Shirley Ryan AbilityLab, 355 E. Erie Street, 23Rd Floor, Chicago, IL, 60611, USA.
  • Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL, USA.
Wu, Ming
  • Legs and Walking Lab, Shirley Ryan AbilityLab, 355 E. Erie Street, 23Rd Floor, Chicago, IL, 60611, USA. w-ming@northwestern.edu.
  • Department of Physical Medicine and Rehabilitation, Northwestern University, Chicago, IL, USA. w-ming@northwestern.edu.
  • Department of Biomedical Engineering, University of Illinois at Chicago, Chicago, IL, USA. w-ming@northwestern.edu.

Grant Funding

  • R01 NS115487 / NINDS NIH HHS
  • R01NS115487 / NINDS NIH HHS

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