Machine learning model for predicting shear forces at the body-seat interface in wheelchair users: A novel approach
Bibliographic record
Abstract
Among the mechanical factors contributing to pressure injuries, shear forces at the body-seat interface play a critical role. This study introduces a novel machine learning approach to predict these forces, using data from pressure mapping systems and a multi-adjustable experimental seat. A supervised learning model was trained on measurements collected from individuals without disabilities and later evaluated on both this group and a cohort of wheelchair users. The selected model - a Random Forest Regression - relied on six input features: a calculated variable, backrest force, feet normal force, seat pan force, backrest area, and the location of the backrest center of pressure. It demonstrated promising accuracy, with an average error below 20% for individuals without disabilities and for wheelchair users whose shear forces were within a similar range. However, performance declined for wheelchair users exhibiting significantly lower shear forces. To improve generalizability, future work will expand the dataset to include participants with more diverse anthropometric characteristics and a broader range of seated postures.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".