Validation of a portable force plate for in-field measurements of balance and postural sway
Bibliographic record
Abstract
Objective: To determine how balance outcomes measured using a portable force platform (FP4, Biometrics Inc) compare to balance measurements from an in-floor mounted force plate (6090-15, Bertec Corp). Methods: Twenty adult volunteers stood on the measurement platform for two trials, 10min apart, to measure bi-pedal medial-lateral and anterior-posterior balance with eyes opened and closed. We measured root mean square, range, and mean velocity of variability of center of pressure from each force plate. Pearson correlation was used to determine relationships between force plate outcomes. Intraclass correlation coefficients (ICC) were used to determine measurement reliability. Differences between eyes open and closed outcomes from each device were determined using t-tests. Results: Correlations between portable and in-floor force plate outcomes ranged from 0.73 to 0.98. ICC values ranged from 0.07 to 0.54. Differences between eyes open and closed outcomes were observed in the anterior-posterior directions on both devices.
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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 | 0.006 | 0.011 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".