Chuckwagon Field Study: High‐Sensitivity Cardiac Troponin‐T Increases with Exercise But Is Not Correlated with the Presence of Arrhythmias During Exercise
Bibliographic record
Abstract
Introduction I n chuckwagon racing, dubbed the “half‐mile of hell”, teams often race multiple consecutive days. Horses are in peak condition, however rare cases of sudden death attributed to cardiovascular failure occur. There are concerns regarding cumulative racing and its impact on the risk of sudden death. The objective was to determine if cumulative exercise affects integrity of the myocardium, assessed by high‐sensitivity troponin‐T ( cTnT ), and if the presence of arrhythmias during race or recovery affects plasma cTnT concentrations. Methods Heart rate and electrical activity were recorded on 148 horses (9 ± 2.7 years) during racing days 1 and 2. 750 plasma samples were analysed (374 pre‐exercise, 376 post‐exercise) comparing cTnT before and after activity (paired t‐test). Associations between consecutive racing days, age and cTnT were analysed ( ANOVA , Pearson Correlation). The relationship between arrhythmias and cTnT was also examined. Results cTnT increased significantly with exercise (pre: 4.52 ng/ L ± 0.17, post: 5.20 ng/ L ± 0.23, P<0.001). However cTnt was not affected by cumulative exercise. A correlation between age and cTnT was found. 4235 arrhythmic events were recorded. No association existed between cTnT (post‐exercise) and the presence of arrhythmias during exercise and recovery. Conclusions This is the first study examining the effect of exercise on high‐sensitivity cTnT in horses and first large‐scale study on chuckwagon horses. Racing increases cTnT , however values remain low, suggesting myocardial damage of little clinical significance. Chuckwagon horses have long careers therefore age and cTnT could be further examined. cTnT was not affected by the presence of arrhythmias during exercise, indicating chuckwagon racing is well tolerated. Ethical Animal Research The study was approved by the Veterinary Sciences Animal Care Committee of the University of Calgary ( AC 120049) and onwer informed consent was obtained. Sources of funding: Clinical Research Fund from the University of Calgary's Faculty of Veterinary Medicine. S ummer Studentships were funded by NSERC . Competing interests: none.
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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) | 0.000 | 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) | 0.001 | 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".