Adaptations to fatigue during a repetitive multiplanar lifting task
Bibliographic record
Abstract
Warehouse workers are often required to perform physically demanding repetitive lifting tasks leading to fatigue. Previous research has primarily focused on constrained lifting tasks when investigating fatigue. The purpose of the current study was to investigate fatigue-based movement adaptations during a multiplanar, ecologically relevant lifting task. Participants (n = 28) lifted, transferred, and lowered a mass continuously for 60 min. Full body kinematics and muscle activity of the lumbar erector spinae, rectus abdominis, external oblique, and anterior deltoids were collected continuously. Results suggest that the load moment arm decreased across the trial (4% decrease), and participants tended to complete movements faster (4% decrease). Further, participants exhibited less variability in thorax-pelvis flexion deviation phase when fatigued (9% decrease). Finally, rectus abdominis activity increased (4%MVIC increase), while anterior deltoid activity decreased over time (2% decrease). These behavioural, coordination-based, and muscular adaptations to fatigue all have potential implications for injury risk in repetitive lifting tasks.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 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) | 0.000 | 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 teacher head, 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".