Large Reductions in Match Play Physical Performance Variables Across a Professional Football Season With Control for Situational and Contextual Variables
Bibliographic record
Abstract
This investigation examined match play physical performance across a professional football season using a multi-camera computerized tracking system. A linear mixed-effects model, controlling for situational and contextual variables, identified decreases in team average total distance (TD): season quarter 1 (Q1) (11047 m) > season quarter 2 (Q2) (10473 m) (P=0.002; ES=Small), season quarter 3 (Q3) (10449 m) (P<0.001; ES=Moderate) and season quarter 4 (Q4) (10385 m) (P<0.001; ES=Moderate); work rate (WR): Q1 (115 m/min) > Q3 (108 m/min) (P<0.001; ES=Moderate), Q4 (107 m/min) (P<0.001; ES=Moderate); Q2 (109 m/min) > Q4 (107 m/min) (P=0.003; ES=Small); high-speed running distance (HSR): Q1 (1051 m) > Q2 (813 m) (P=0.006; ES=Small); number of high-speed runs (NHSR): Q1 (87) > Q2 (65) (P<0.001; ES=Small), Q3 (64) (P=0.002; ES=Small); sprint distance (SD): Q1 (202 m) > Q4 (130 m) (P<0.001; ES=Moderate), Q2 (179 m) > Q3 (165 m) (P=0.035; ES=Small), Q4 (130 m) (P<0.001; ES=Moderate) and number of sprints (NS): Q1 (20.4) > Q3 (10.2) (P<0.001; ES=Moderate), Q4 (8.3) (P<0.001; ES=Large); Q2 (14.9) > Q3 (10.2) (P<0.001; ES=Moderate), Q4 (8.3) (P<0.001; ES=Large). Within-position changes were observed for WR: Q1 (122 m/min) > Q4 (113 m/min) (P=0.002; ES=Large) in central midfielders and for NS: Q1 > Q3 in wide defenders (21.7 vs 10.8) (P=0.044; ES=Large) and central midfielders (18.1 vs 8.3) (P=0.002; ES=Large); Q1 > Q4 in central defenders (13.1 vs 5.3) (P=0.014; ES=Large), wide defenders (21.6 vs 7.1) (P<0.001; ES=Very Large), central midfielders (18.1 vs 8.5) (P=0.005; ES=Large) and wide midfielders (20.8 vs 12.2) (P=0.012; ES=Large); Q2 > Q3 in central midfielders (16.9 vs 8.3) (P=0.002; ES=Large) and Q2 > Q4 in wide defenders (16.3 vs 7.1) (P=0.005; ES=Very Large), central midfielders (16.9 vs 8.5) (P=0.004; ES=Large) and wide midfielders (20.8 vs 12.2) (P=0.007; ES=Large). Match-play physical performance reduced across the competitive season. The most notable reductions were observed in wide defenders, central midfielders and wide midfielders in sprint performance indices.
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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".