Abstract
Purpose
In this study, we examined whether the decrease in endothelial function associated with short-term exposure to elevated retrograde shear rate (SR), could be prevented when combined with a concurrent drop in transmural pressure in humans.
Methods
Twenty-five healthy individuals reported to our laboratory on three occasions to complete 30-min experimental conditions, preceded and followed by assessment of endothelial function using flow-mediated dilation (FMD). We used cuff inflation for 30-min to manipulate retrograde SR and transmural pressure in the brachial artery. Subjects underwent, in randomised order: (1) forearm cuff inflation to 60 mmHg (distal cuff; causing increase in retrograde SR), (2) upper arm cuff inflation to 60 mmHg (proximal cuff; causing increase in retrograde SR + decrease in transmural pressure), and (3) no cuff inflation (Control).
Results
The distal and proximal cuff conditions both increased brachial artery retrograde SR (p < 0.001) and oscillatory shear index (p < 0.001). The Control intervention did not alter SR patterns or FMD (p > 0.05). A significant interaction-effect was found for FMD (p < 0.05), with the decrease during distal cuff (from 6.9 ± 2.3% to 6.1 ± 2.5%), being reversed to an increase with proximal cuff (from 6.3 ± 2.0 to 6.9 ± 2.0%). The proximal cuff-related increase in FMD could not be explained by the decrease in antegrade or increase in retrograde shear.
Conclusion
This study suggests that a decrease in transmural pressure may ameliorate the decline in endothelial function that occurs following exposure to elevated retrograde shear in healthy individuals.
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Abbreviations
- ANOVA:
-
One-way analysis of variance
- DBP:
-
Diastolic blood pressure
- FMD:
-
Flow-mediated dilation
- MAP:
-
Mean arterial pressure
- NO:
-
Nitric oxide
- OSI:
-
Oscillatory shear index
- ROI:
-
Regions of interest
- ROS:
-
Reactive oxygen species
- SBP:
-
Systolic blood pressure
- SR:
-
Shear rate
- SRauc :
-
Shear rate area under the curve
- TTP:
-
Time to peak
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Funding
MB is financially supported by a grant from the Fonds de Recherche du Québec–Santé (FRQ-S) and the Cardiometabolic Healthy, Diabetes and Obesity Research Network (CMDO). DG is supported by a NHMRC Principal Research Fellowship (APP1080914).
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Dawson, E.A., Boidin, M., Thompson, R. et al. Impact of proximal and distal cuff inflation on brachial artery endothelial function in healthy individuals. Eur J Appl Physiol 121, 1135–1144 (2021). https://doi.org/10.1007/s00421-021-04605-8
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DOI: https://doi.org/10.1007/s00421-021-04605-8