Applied Tension and Coping with Blood Donation: A Randomized Trial
Bibliographic record
Abstract
BACKGROUND: Despite the ongoing need for blood donation, few people give blood. A common reason is concern about vasovagal symptoms. PURPOSE: The aim of this study was to evaluate the effectiveness of applied tension in reducing vasovagal symptoms during blood donation and the mechanisms of action. METHOD: Two hundred eighty-two young adult blood donors were randomly assigned to conditions involving applied tension during the pre-donation wait period, during the blood draw, both, or no applied tension at all. RESULTS: Applied tension was effective in reducing vasovagal symptoms in blood donors, particularly when practiced during the pre-donation wait period (p < 0.001). People who practiced applied tension during the pre-donation wait period required less treatment for vasovagal reactions than people who did not (8% vs. 16%). CONCLUSIONS: The results of this study suggest that the effects of applied tension on vasovagal symptoms are not mediated entirely by exercise-related changes in blood pressure and heart rate. Rather, it may reduce anxiety or physiological consequences of anxiety. Applied tension is a useful treatment which can help people cope during blood donation and other invasive medical interventions.
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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 | 0.003 | 0.006 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.002 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.003 | 0.003 |
| Insufficient payload (model declined to judge) | 0.011 | 0.001 |
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".