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Identifying the most representative actigraphy variables reflecting standardized hand function assessments for remote
Youngsub Hwang1, Jeong-Yi Kwon2
1Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul, Republic of Korea.
Insights
Magnitude ratio from actigraphy offers objective insights complementing hand function assessments in children with unilateral cerebral palsy. This aids in evaluating interventions and understanding motor function more comprehensively.
Area of Science:
- Pediatric Rehabilitation
- Motor Control and Biomechanics
- Assistive Technology
Background:
- Accurate assessment of physical activity and motor function is vital for children with cerebral palsy (CP).
- Unilateral CP affects motor function, necessitating reliable evaluation methods.
- Standardized in-laboratory assessments and real-world activity monitoring are used to assess function.
Purpose of the Study:
- To investigate the correlation between real-world activity monitoring outcomes and in-laboratory hand function assessments.
- To explore the utility of actigraphy data in children with unilateral cerebral palsy.
- To identify which actigraphy variables best reflect hand function.
Main Methods:
- Actigraphy data collected over 3 days from children (4-12 years) with unilateral CP.
- Hierarchical clustering and Principal Component Analysis (PCA) used to manage high-dimensional actigraphy data.
- Correlation analysis between actigraphy-derived variables and standardized hand function assessments.
Main Results:
- Magnitude ratio variables (ln[affected side/less-affected side]) showed stronger correlations with hand function assessments than activity time/distance.
- Hierarchical clustering identified two clusters, with magnitude ratio variables correlating highly with Melbourne Assessment 2, Pediatric Motor Activity Log, Assisting Hand Assessment, and Manual Ability Classification System.
- Principal Component 2 (magnitude ratio) positively associated with subcategories of standardized measures; Principal Component 1 (activity time/distance) showed limited associations.
Conclusions:
- Actigraphy's magnitude ratio provides objective data complementing in-laboratory hand function assessments in unilateral CP.
- This approach can enhance the evaluation of interventions and understanding of motor function in children with CP.
- Future studies can leverage actigraphy magnitude ratio for more comprehensive functional assessments.
Background:
Accurate assessment of physical activity and motor function in children with cerebral palsy is crucial for determining the effectiveness of interventions. This study aimed to investigate the correlation between real-world activity monitoring outcomes and in-laboratory standardized hand function assessments in children with unilateral cerebral palsy.
Methods:
Actigraphy data were collected over 3 days from children aged 4-12 years with unilateral cerebral palsy before in-laboratory assessments. To tackle the high dimensionality and collinearity of actigraphy variables, we first applied hierarchical clustering using the Pearson correlation coefficient as the distance metric and then performed a principal component analysis (PCA) to reduce the dimensionality of our data.
Results:
Both hierarchical clustering and PCAs revealed a consistent pattern in which magnitude ratio variables (ln[affected side magnitude/less-affected side magnitude]) were more strongly associated with standardized assessments of hand function than with activity time and distance domain variables. Hierarchical clustering analysis identified two distinct clusters of actigraphy variables, with the second cluster primarily consisting of magnitude ratio variables that exhibited the strongest correlation with Melbourne Assessment 2, Pediatric Motor Activity Log, Assisting Hand Assessment, and Manual Ability Classification System level. Principal component 2, primarily representing the magnitude ratio domain, was positively associated with a meaningful portion of subcategories of standardized measures, whereas principal component 1, representing the activity time and distance component, showed limited associations.
Conclusions:
The magnitude ratio of actigraphy can provide additional objective information that complements in-laboratory hand function assessment outcomes in future studies of children with unilateral cerebral palsy. TRIAL REGISTRATION IN CLINICALTRIALS.GOV: NCT04904796 (registered prospectively; date of registration: 23/05/2021).
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