Abstract
Exercise-specific joint selection can improve skeleton-based correctness classification, but what does that gain establish? We audit 1,057 repetitions from ten REHAB24-6 subjects, separating evaluation aggregation, subset structure, and temporal representation. The manual-subset kNN gain changes from 0.055 for pooled out-of-fold AUROC to 0.020 for equal-weight within-person AUROC; both paired intervals include zero. Among 1,000 dimension-matched random maps, 14 match or exceed the manual pooled result, versus 145 when bilateral structure and trunk inclusion are also matched. RBF-SVM retains a positive within-person gain, whereas logistic regression and a random-convolution comparator have negative point gains under that estimand. Sequence-order and paired-seed controls further qualify the interpretation. This exploratory audit shows why joint-selection claims require explicit estimands and structurally appropriate controls; it does not establish a new algorithm or clinical benefit.
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Publication details
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- Green open access
Cite this article
APA 7
Chen, H., Yu, J., Zhang, Y., & Ye, B. (2026). When Does Exercise-Specific Joint Selection Help? An Audit of Evaluation and Control Design. https://omanscience.com/en/articles/when-does-exercise-specific-joint-selection-help-an-audit-of-evaluation-and-control-design
MLA 9
Chen, Haotian, et al. "When Does Exercise-Specific Joint Selection Help? An Audit of Evaluation and Control Design." https://omanscience.com/en/articles/when-does-exercise-specific-joint-selection-help-an-audit-of-evaluation-and-control-design.
Chicago (author–date)
Chen, Haotian, Jingkun Yu, Yuning Zhang, and Bowen Ye. 2026. "When Does Exercise-Specific Joint Selection Help? An Audit of Evaluation and Control Design." https://omanscience.com/en/articles/when-does-exercise-specific-joint-selection-help-an-audit-of-evaluation-and-control-design.
Harvard
Chen, H., Yu, J., Zhang, Y. and Ye, B. (2026) 'When Does Exercise-Specific Joint Selection Help? An Audit of Evaluation and Control Design', Available at: https://omanscience.com/en/articles/when-does-exercise-specific-joint-selection-help-an-audit-of-evaluation-and-control-design.
Vancouver
Chen H, Yu J, Zhang Y, Ye B. When Does Exercise-Specific Joint Selection Help? An Audit of Evaluation and Control Design. https://omanscience.com/en/articles/when-does-exercise-specific-joint-selection-help-an-audit-of-evaluation-and-control-design
IEEE
H. Chen, J. Yu, Y. Zhang, and B. Ye, "When Does Exercise-Specific Joint Selection Help? An Audit of Evaluation and Control Design," https://omanscience.com/en/articles/when-does-exercise-specific-joint-selection-help-an-audit-of-evaluation-and-control-design.