Directional sensitivity of the cerebral pressure–flow relationship in young healthy individuals trained in endurance and resistance exercise
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Bibliographic record
Abstract
New Findings What is the central question of this study? Does habitual exercise modality affect the directionality of the cerebral pressure–flow relationship? What is the main finding and its importance? These data suggest the hysteresis‐like pattern of dynamic cerebral autoregulation appears present in long‐term sedentary and endurance‐trained individuals, but absent in resistance‐trained individuals. This is the first study to expand knowledge on the directional sensitivity of the cerebral pressure–flow relationship to trained populations. Abstract Evidence suggests the cerebrovasculature may be more efficient at dampening cerebral blood flow (CBF) variations when mean arterial pressure (MAP) transiently increases, compared to when it decreases. Despite divergent MAP and CBF responses to acute endurance and resistance training, the long‐term impact of habitual exercise modality on the directionality of dynamic cerebral autoregulation (dCA) is currently unknown. Thirty‐six young healthy participants (sedentary ( n = 12), endurance‐trained ( n = 12), and resistance‐trained ( n = 12)) undertook a 5‐min repeated squat–stand protocol at two forced MAP oscillation frequencies (0.05 and 0.10 Hz). Middle cerebral artery mean blood velocity (MCAv) and MAP were continuously monitored. We calculated absolute (ΔMCAv T /ΔMAP T ) and relative (%MCAv T /%MAP T ) changes in MCAv and MAP with respect to the transition time intervals of both variables to compute a time‐adjusted ratio in each MAP direction, averaged over the 5‐min repeated squat–stand protocols. At 0.10 Hz repeated squat–stands, ΔMCAv T /ΔMAP T and %MCAv T /%MAP T were lower when MAP increased compared with when MAP decreased for sedentary (ΔMCAv T /ΔMAP T : P = 0.032; %MCAv T /%MAP T : P = 0.040) and endurance‐trained individuals (ΔMCAv T /ΔMAP T : P = 0.012; %MCAv T /%MAP T P = 0.007), but not in the resistance‐trained individuals (ΔMCAv T /ΔMAP T : P = 0.512; %MCAv T /%MAP T P = 0.666). At 0.05 Hz repeated squat–stands, time‐adjusted ratios were similar for all groups (all P > 0.605). These findings suggest exercise training modality does influence the directionality of the cerebral pressure–flow relationship and support the presence of a hysteresis‐like pattern during 0.10 Hz repeated squat–stands in sedentary and endurance‐trained participants, but not in resistance‐trained individuals. In future studies, assessment of elite endurance and resistance training habits may further elucidate modality‐dependent discrepancies on directional dCA measurements.
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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 it