Sympathetic Restraint Of Blood Flow During Prolonged Exercise
Bibliographic record
Abstract
Sympathetic nervous system restraint of skeletal muscle blood flow during dynamic exercise has been well documented. However, whether sympathetic restraint of muscle blood flow is constant throughout a prolonged exercise bout has not been established. PURPOSE To investigate the effect of exercise duration on α2-adrenergic-receptor mediated restraint of skeletal muscle blood flow during prolonged constant-load exercise. METHODS Mongrel dogs were instrumented chronically with transit-time flow probes on the external iliac arteries and an indwelling catheter in a branch of the femoral artery. On separate days, a flow-adjusted dose of a selective α2-adrenergic-receptor antagonist (rauwolscine) was infused following 5, 30 and 50 min of treadmill exercise at 3 and 6 mph. Hindlimb blood flow (HBF) and mean arterial pressure (MAP) were monitored continuously. Vascular conductance (VC) was calculated as HBF/MAP. RESULTS During exercise at 3 miles/h, rauwolscine infusion resulted in a greater (p < 0.05) increase in VC following 5 (49±9 %), compared to 30 (23±5 %) and 50 (23±5 %) min of exercise. In contrast, rauwolsince resulted in a similar increase in VC following 5 (19±4 %), 30 (16±5 %) and 50 (15±5 %) min of exercise at 6 miles/h. CONCLUSIONS These results suggest that exercise duration influences0 α2-adrenergic-receptor mediated restraint of muscle blood flow. Futhermore, these results support the concept that exercise sympatholysis may be influenced by both the intensity and duration of exercise. Supported by NHLBI and NSERC, Canada
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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 | 0.000 |
| 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) | 0.001 | 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".