P134 A COMPUTATIONAL INVESTIGATION OF CONFOUNDING FACTORS AFFECTING FLOW MEDIATED DILATION: TOWARDS IMPROVED ENDOTHELIAL FUNCTION ASSESSMENT

2018 ◽  
Vol 24 (C) ◽  
pp. 118
Author(s):  
Weiwei Jin ◽  
Phil Chowienczyk ◽  
Jordi Alastruey
Keyword(s):  
Endothelial Function ◽  
Flow Mediated Dilation ◽  
Confounding Factors ◽  
Computational Investigation ◽  
Factors Affecting ◽  
Function Assessment

Abstract 319: Effects of Muscle Stretching on Flow-Mediated Dilation of Popliteal Artery in Patients With Peripheral Artery Disease

2017 ◽  
Vol 37 (suppl_1) ◽  
Author(s):  
Kazuki Hotta ◽  
Wayne B Batchelor ◽  
James Graven ◽  
Vishal Dahya ◽  
Thomas E Noel ◽  
...  
Keyword(s):  
Endothelial Function ◽  
Popliteal Artery ◽  
Calf Muscle ◽  
Walking Distance ◽  
Flow Mediated Dilation ◽  
Vascular Endothelial ◽  
Vascular Endothelial Function ◽  
Peripheral Artery ◽  
Muscle Stretching ◽  
Artery Disease

Patients with peripheral artery disease (PAD) frequently have walking impairment due to lower extremity claudication. Our preliminary results in a rat model of aging indicate that a program of daily calf muscle stretching improves endothelium-dependent dilation of soleus muscle arterioles and increases soleus muscle blood flow during exercise. However, the effects of muscle stretching on the function of arteries supplying the legs of PAD patients is unknown. We hypothesized that daily calf muscle stretching improves vascular endothelial function and walking distance in PAD patients. To test our hypothesis, a randomized, non-blinded, crossover study was performed. Four weeks of muscle stretching (30 min/d, 5 days/wk) and 4 weeks of sedentary lifestyle (no stretching) were performed in random order. Thirteen patients with PAD participated in this study (71 ± 2 years old; 7 males and 6 females). During the stretching intervention both ankle joints were maintained at 15o of dorsiflexion using ankle dorsiflexion splints to stretch their calf muscles at home. Flow-mediated dilation (FMD; dilation to post-occlusion reactive hyperemia) and nitroglycerin-induced dilation (dilation to sublingual 0.4 mg nitroglycerin) of the popliteal artery were measured after 4 weeks of muscle stretching and after the no stretching period using ultrasound. A six-minute walk test was also performed to obtain walking distance. After 4 weeks of muscle stretching, FMD and 6-minute walking distance significantly improved as compared to the values measured after 4 weeks of no stretching (FMD: 5.2 ± 0.6 % vs. 3.7 ± 0.4 %, P=0.003 stretching vs. no stretching, 6-minute walking distance: 355 ± 32 m vs. 311 ± 31 m, P=0.007, stretching vs. no stretching; mean ± SE). No difference in nitroglycerin-induced dilation was found between groups (10.9 ± 1.4 vs. 9.9 ± 1.1 %, P=0.54, stretching vs. no stretching). Percentage change of walking distance (%change = [(stretching - no stretching) / no stretching] x 100) significantly correlated with the %change of FMD (R 2 =0.65, P=0.03). These results indicate that static calf muscle stretching enhances vascular endothelial function of the popliteal artery, contributing to improvement of walking tolerance in PAD patients.

Abstract 530: Impact of a Single Mixed Mediterranean-Type Meal Compared with a High-Saturated Fat Meal on Postprandial Endothelial Function and Metabolic Markers

2012 ◽  
Vol 32 (suppl_1) ◽  
Author(s):  
Sebastien Lacroix ◽  
Christine Des Rosiers ◽  
Mathieu Gayda ◽  
Anil Nigam
Keyword(s):  
Endothelial Dysfunction ◽  
Endothelial Function ◽  
Saturated Fat ◽  
Random Order ◽  
Flow Mediated Dilation ◽  
Omega 3 ◽  
Metabolic Markers ◽  
Endothelial Impairment ◽  
Artery Flow ◽  
Fat Meal

Background: Endothelial dysfunction is considered a precursor of atherosclerosis and is an independent predictor of cardiovascular events. A high-saturated fat meal (HFM) has been shown to induce postprandial endothelial dysfunction. However, no studies have evaluated the acute endothelial effect of a single mixed Mediterranean-type meal (MMM). Our objective was to evaluate postprandial endothelial and metabolic function in response to a MMM in comparison to an isocaloric HFM. Methods: In this ongoing crossover study, 26 of 28 healthy non-smoking males have completed the research protocol. In random order on two separate days during a 1-week interval, subjects were fed two isocaloric meals after an overnight fast. The MMM (885 kcal) consisted of fresh salmon, almonds and vegetables baked in olive oil providing 51% of total calories from fat (7.87g SFA and 2.29g of omega-3, 2:1 DHA:EPA). The HFM consisted of a McDonald’s sausage, egg and cheese McMuffin and three hashbrowns (858 kcal) providing 58% of total energy from fat (14.78g SFA and no omega-3). Endothelial function was evaluated by measuring brachial artery flow-mediated dilation (%FMD) at baseline and at two (T2) and four (T4) hours postprandial. Results: Mean postprandial %FMD tends to be less impaired following the MMM than the HFM (variation at T4 -0.15±3.6% vs -2.83±3.3% respectively, p<0.1). Postprandial variations of TG and TG/HDL at T4 were also less severe with the MMM than the HFM (p≤0.05) and did not correlate to %FMD variations. When subdividing the population on the basis of the median fasting TG levels (0.90 mmol/L), the HFM led to significant endothelial impairment in the subjects with higher-TG while it had no effect in the low-TG group. Conclusion: Our data suggest that a single MMM exerts less of a deleterious effect on postprandial endothelial function and metabolic markers than does a HFM. A single MMM could thus be less atherogenic than a HFM. Moreover, subjects with higher fasting TG levels (avg. 1.54±0.59 mmol/L, well bellow hypertriglyceridemia threshold) could be at higher risk of endothelial injury following a single HFM. Data on all 28 subjects will be available in April 2012.

scholarly journals Acute Endothelial Benefits of Fat Restriction over Carbohydrate Restriction in Type 2 Diabetes Mellitus: Beyond Carbs and Fats

Nutrients ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1859 ◽  
Author(s):  
Renate Barbosa-Yañez ◽  
Ulrike Dambeck ◽  
Linna Li ◽  
Jürgen Machann ◽  
Stefan Kabisch ◽  
...  
Keyword(s):  
Type 2 Diabetes ◽  
Adipose Tissue ◽  
Endothelial Function ◽  
Body Fat ◽  
Protein Intake ◽  
Diet Group ◽  
Flow Mediated Dilation ◽  
Reduced Body ◽  
Diabetes Patients

Background: Cardiovascular diseases (CVD) are the major cause of mortality in type 2 diabetes patients (T2DM). The causes are embedded in a complex interplay between excess body fat, insulin resistance and serum lipid anomalies. Endothelial homeostasis is strongly affected by this pathogenic network. Even though metabolic changes and weight loss improve vascular endothelial function, the effect of different dietary approaches is still uncertain for type 2 diabetes patients. Objective: We aimed to compare the acute effects of a hypocaloric very low carbohydrate (VLC) diet versus a hypocaloric low fat (LF) diet on flow mediated dilation (FMD), intrahepatic lipid (IHL) accumulation and visceral adipose tissue as independent risk factors of CVD in T2DM patients. Design: 36 T2DM patients (age 63 ± 8 years, 60% females) were randomly assigned to the VLC diet (4–10% of total energy intake (E)) or to the LF diet (<30% E) for 3 weeks. Endothelial function was assessed by the flow mediated dilation (FMD) method. Adipose tissue depots and IHL were determined by magnetic resonance. Results: Both dietary strategies reduced body weight, body fat content and IHL. Unexpectedly, the LF group experienced significantly greater enhancement of FMD, compared to the VLC group. The FMD showed a positive correlation with protein intake and fat intake in the LF group, while it revealed a negative correlation with protein intake in the VLC diet group. Conclusions: Reduction of total and hepatic adiposity was shown to be successful using either the VLC or LF hypocaloric diets, however, improvements in FMD may be related to the interplay of fat and protein intake.

Flow-mediated dilation does/does not reflect nitric oxide-mediated endothelial function

2005 ◽  
Vol 99 (4) ◽  
pp. 1621-1621 ◽  
Author(s):  
Clare E. Austin
Keyword(s):  
Nitric Oxide ◽  
Endothelial Function ◽  
Flow Mediated Dilation ◽  
September Issue

This letter is in response to the Point:Counterpoint series “Flow-mediated dilation does/does not reflect nitric oxide-mediated endothelial function” that appeared in the September issue (vol. 99: 1233–1238, 2005; doi:10.1152/japplphysiol.00601.2005; http://jap.physiology.org/content/vol99/issue3/2005 ).

scholarly journals The Effect of Cilostazol on Endothelial Function as Assessed by Flow-Mediated Dilation in Patients with Coronary Artery Disease

2016 ◽  
Vol 23 (10) ◽  
pp. 1168-1177 ◽  
Author(s):  
Hiroyoshi Mori ◽  
Atsuo Maeda ◽  
Kohei Wakabayashi ◽  
Tokutada Sato ◽  
Masahiro Sasai ◽  
...  
Keyword(s):  
Coronary Artery Disease ◽  
Coronary Artery ◽  
Endothelial Function ◽  
Flow Mediated Dilation ◽  
Artery Disease

Isometric handgrip training does not improve flow-mediated dilation in subjects with normal blood pressure

2007 ◽  
Vol 112 (7) ◽  
pp. 403-409 ◽  
Author(s):  
Cheri L. Mcgowan ◽  
Andrew S. Levy ◽  
Neil Mccartney ◽  
Maureen J. Macdonald
Keyword(s):  
Blood Pressure ◽  
Endothelial Function ◽  
Internal Control ◽  
Repeated Measures ◽  
Flow Mediated Dilation ◽  
Normal Blood Pressure ◽  
Isometric Handgrip ◽  
Repeated Measures Design ◽  
Artery Flow ◽  
Maximal Effort

Isometric HG (handgrip) training lowers resting arterial BP (blood pressure), yet the mechanisms are elusive. In the present study, we investigated improved systemic endothelial function as a mechanism of arterial BP modification following isometric HG training in normotensive individuals. This study employed a within-subject repeated measures design primarily to assess improvements in BA FMD (brachial artery flow-mediated dilation; an index of endothelium-dependent vasodilation), with the non-exercising limb acting as an internal control. Eleven subjects performed four 2-min unilateral isometric HG contractions at 30% of maximal effort, three times per week for 8 weeks. Pre-, mid- and post-training resting ABP and BA FMD (exercised arm and non-exercised arm) were measured via automated brachial oscillometry and ultrasound respectively. BA FMD (normalized to the peak shear rate experienced in response to the reactive hyperaemic stimulus) remained unchanged [exercised arm, 0.029±0.003 to 0.026±0.003 to 0.029±0.004%/s−1 (pre- to mid- to post-training respectively); non-exercised arm, 0.023±0.003 to 0.023±0.003 to 0.024±0.003%/s−1 (pre- to mid- to post-training respectively); P=0.22]. In conclusion, improved systemic endothelial function is unlikely to be responsible for lowering arterial BP in this population.

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