Post‐exercise cardiac troponin I release and clearance in normal Standardbred racehorses
Bibliographic record
Abstract
Summary Background There are currently no studies detailing cardiac troponin I ( cTnI ) release in normal horses post‐exercise using an analytically validated assay. These data are essential for selecting appropriate sampling times in equine athletes with suspected myocardial injury. Objective To plot the magnitude and time course of cTnI release after maximal effort, using validated cTnI assays. Study design Descriptive longitudinal study. Methods Five clinically normal Standardbred racehorses in race training were included in the study. Horses were exercised in harness at near‐race intensity. Blood samples were taken immediately pre‐ and post‐exercise and then hourly for 24 h. Samples were analysed using the validated high‐sensitivity cTnI assay and a contemporary sensitivity cTnI assay. Results Mean resting cTnI was 1.33 ± 0.6 s.d. ng/L (range, 0.82–2.33 ng/L) using assay A. All horses were below the detection limit at rest using assay B. Peak elevation occurred 2–6 h post‐exercise with both assays (mean, 4.6 ± 1.7 and 4.0 ± 2 h, respectively). Mean peak increase in cTnI was 11.96 ± 9.41 ng/L (range, 1.72–23.76 ng/L) using assay A. Peak concentrations were detectable in three of the horses using assay B and were between 0.039 and 0.051 μg/L (mean: 0.043 ± 0.006 μg/L). All horses returned to baseline within 24 h. Main limitations A small (n = 5) convenience sample was used as random sampling was not logistically possible. Conclusions All horses experienced an increase in cTnI post‐exercise, with peak occurring 2–6 h post‐exercise. Cardiac troponin I elevation was detected earlier using the high‐sensitivity assay, which may convey a diagnostic advantage. Targeted studies are needed to determine the significance of these increases.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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 | 0.001 |
| 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".