What question did this study set out to answer?

This study aims to assess upper limb movement smoothness in children with neurological disorders using objective metrics from markerless motion tracking.

May 24, 2026Journal of NeuroEngineering and RehabilitationOpen Access

Evaluating upper limb movement smoothness metrics derived from markerless 3D motion tracking in children with neurological disorders

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Authors

NHNikolas HesseUniversity Children's Hospital Zurich JLJan LieberUniversity Children's Hospital Zurich HHHubertus J. A. van HedelUniversity Children's Hospital Zurich

Discussion

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Overview

Randomized trial evaluates movement smoothness in children with neurological disorders, suggesting markerless tracking improves clinical assessments.

Key Points

This study aims to assess upper limb movement smoothness in children with neurological disorders using objective metrics from markerless motion tracking.
Thirty-eight children with neurological diagnoses performed reaching tasks while recorded with an RGB-D camera.
Upper limb kinematics were analyzed using SMPLify-KiDS, computing smoothness metrics log dimensionless jerk (LDJ) and spectral arc length (SPARC).
Therapist scores for movement were correlated with quantitative metrics using Spearman's rank correlation and non-parametric tests were applied for analysis.
Moderate to strong correlations were found between smoothness metrics and therapist scores, indicating reliability of the metrics.
Significant differences in metrics were observed across therapist score levels, validating the sensitivity of quantitated evaluations.
LDJ showed a strong correlation with task duration and had closer alignment with therapist scores compared to SPARC.

Cite This Study

Hesse et al. (2026) studied this question.

synapsesocial.com/papers/6a12950b48a0ea166567146e https://doi.org/10.1186/s12984-026-02020-8

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May 24, 2026Journal of NeuroEngineering and RehabilitationOpen Access

Evaluating upper limb movement smoothness metrics derived from markerless 3D motion tracking in children with neurological disorders

View Full Paper

Ask AI

Bookmark

Authors

NHNikolas HesseUniversity Children's Hospital Zurich JLJan LieberUniversity Children's Hospital Zurich HHHubertus J. A. van HedelUniversity Children's Hospital Zurich

Discussion

Member takes

Overview

Randomized trial evaluates movement smoothness in children with neurological disorders, suggesting markerless tracking improves clinical assessments.

Key Points

This study aims to assess upper limb movement smoothness in children with neurological disorders using objective metrics from markerless motion tracking.
Thirty-eight children with neurological diagnoses performed reaching tasks while recorded with an RGB-D camera.
Upper limb kinematics were analyzed using SMPLify-KiDS, computing smoothness metrics log dimensionless jerk (LDJ) and spectral arc length (SPARC).
Therapist scores for movement were correlated with quantitative metrics using Spearman's rank correlation and non-parametric tests were applied for analysis.
Moderate to strong correlations were found between smoothness metrics and therapist scores, indicating reliability of the metrics.
Significant differences in metrics were observed across therapist score levels, validating the sensitivity of quantitated evaluations.
LDJ showed a strong correlation with task duration and had closer alignment with therapist scores compared to SPARC.

Cite This Study

Hesse et al. (2026) studied this question.

synapsesocial.com/papers/6a12950b48a0ea166567146e https://doi.org/10.1186/s12984-026-02020-8

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