Cardio‐postural interactions and aging
Bibliographic record
Abstract
Introduction: Until recently cardiovascular and postural reflexes have been looked at as independent control systems. In this study we propose an interaction between these two systems, particularly in relation to the maintenance of venous return through skeletal muscle pump in conditions of impaired vascular control or increased venous pooling. We investigated this “cardio‐postural” interaction with aging. Methods: Healthy elderly and young subjects were tested in a sit to stand test. Mediolateral centre of pressure (COP) trajectory, as well as non‐invasive heart rate and blood pressure data were collected in two test conditions (eyes open or eyes closed) in randomized order. Data was collected in over a 10 minute period in two equal phases (sitting followed by standing). A power spectral density analysis was performed for mediolateral sway and BP for each subject. Results: Postural sway power was higher in elderly subjects with distinctive low frequency peaks (<0.1 Hz) that matched peaks found in blood pressure. Both COP and BP data had variation in the higher frequency range (0.15–0.25 Hz) that corresponded to respiration. The observed increase, with age, in postural sway in a region corresponding to low frequency blood pressure variation may represent an increase in skeletal muscle pump activity to maintain blood pressure in the elderly due to a reduction in baroreflex with age. Funded by Simon Fraser University .
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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 | 0.000 | 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) | 0.000 | 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".