The Effect of an Isometric Strength Training Protocol on Valgus Angle During a Drop-Jump Landing in Elite Female Volleyball Players
Bibliographic record
Abstract
The purposes of this study were to a) strengthen the gluteal and hamstring muscles of 14 elite female volleyball players via a six week isometric strength training program to b) determine changes in peak knee valgus angle, c) determine any changes in tibial acceleration, and d) determine changes in vertical ground reaction forces at peak valgus angle during a drop-jump landing task. Significant strength increases were seen in hip extension (20.5%), abduction (27.5%), and knee flexion (23.5%) in the training group. No significant group changes were observed for knee valgus angle, tibial acceleration, or ground reaction forces. Notable significant individual changes were found for knee valgus angle, knee flexion angle, peak vertical ground reaction forces, and tibial accelerations. A trend of decreased knee flexion in the training group was also observed. Isometric strength training increases strength, and could potentially decrease knee valgus in certain individuals.
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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 | 0.000 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
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".