Endurance exercise training attenuates fibrosis and collagen cross‐linking in myocardium of aged F344BNF1 rats
Bibliographic record
Abstract
The objective of the study was to determine if endurance exercise training (ET) could attenuate the age‐related increase in fibrosis and collagen cross‐linking in the myocardium of the heart, which is thought to be a cause of the age‐related decline in diastolic function. Fisher 344 × Brown Norway F1 rats underwent ET from late middle age into senescence. Genes for collagen synthesis and degradation were assessed by polymerase chain reaction. Matrix metalloproteinase (MMP) activity was assessed using EnzChek Gelatinase/Collagenase Assay kit, and collagen cross‐linking was determined indirectly by immunohistochemical staining for advanced glycation end‐products. Tissue inhibitor of matrix metalloproteinase‐1 (TIMP1) gene expression, TIMP and MMP1 protein expression, and MMP activity increased with age but with no ET effect. ET attenuated the age‐related increase in fibrosis and collagen cross‐linking, while increasing survival rate. This could have attenuated the age‐related decline in myocardial compliance and in turn have helped attenuate the decrease in diastolic function generally seen with aging. This work was supported by an operating grant from CIHR (MOP 57808).
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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) | 0.000 | 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".