The Effect Of A High-fat Meal On Sympathetic Vasoconstrictor Responsiveness In Men And Women
Bibliographic record
Abstract
Consumption of a high-fat (HF) meal has been shown to reduce flow-mediated dilation (FMD) in men, but not women. This decline in FMD may be a result of decreased nitric oxide (NO) bioavailability. NO inhibits sympathetic vasoconstriction and a HF meal may, therefore, heighten sympathetic vasoconstrictor responsiveness. However, the effect of a HF meal on sympathetic vasoconstriction in men and women has not been investigated. PURPOSE: The purpose of this study was to investigate the hypothesis that consumption of a HF meal would heighten sympathetic vasoconstrictor responsiveness in men, but have no effect in women. METHODS: In a randomized cross-over design, young males (n=15) and females (n=15) consumed a HF or an isocaloric low-fat (LF) meal on separate days. Two hours post-meal, subjects underwent a cold pressor test (CPT) and measurement of brachial artery FMD to determine sympathetic vasoconstrictor responsiveness and endothelial function, respectively. Beat-by-beat blood pressure was measured by Finometer and mean arterial pressure (MAP) was calculated. Forearm blood flow (FBF) was measured by Doppler ultrasound at the brachial artery and forearm vascular conductance (FVC) was calculated as FBF/MAP. Sympathetic vasoconstrictor responsiveness was calculated as the percentage decrease in FVC (%∆FVC) in response to CPT. FMD was calculated as the percentage increase in brachial artery diameter from baseline and normalized for cumulative shear rate. RESULTS: Sympathetic vasoconstrictor responsiveness was not different (p>0.05) between meal conditions or between females (LF: -27±14%: HF: -30±15%) and males (LF: -29±23%: HF: -24±16%) in either meal condition. FMD was higher (main effect of sex; p<0.05) in females (LF: 8.1±2.1%: HF: 7.4±1.4%) compared to males (LF: 6.2±1.5%: HF: 5.1±1.1%) and FMD was lower (main effect of meal; p<0.05) in the HF compared to the LF meal condition. No interaction (p>0.05) was observed between meal condition and sex for FMD. FMD normalized for shear rate was not different (p>0.05) between meal conditions or between females and males in either meal condition. CONCLUSION: These data suggest that, despite evidence of a post-prandial decrease in endothelial function, a HF meal does not alter sympathetic vasoconstrictor responsiveness in men or women.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.001 |
| 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".