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This research is,being done to better understand how antioxidants (vitamins C, E and Alpha Lipoic Acid) af,f,ect the heart,and arteries. For this study, we will obtain blood samples to measure oxidative stress markers (substances in the blood that are linked to oxidative stress), cholesterol, insulin and blood glucose (sugar), as well as measure how well the heart and arteries are working following supplementation with the antioxidants.
Our central hypothesis is that acute antioxidant supplementation will improve arterial function at rest and during exercise in African Americans without an impact of age, whereas aging will modify these effects in Caucasians.
The overall goal of this application is to investigate the effect of aging on how acute antioxidant supplementation affects decrements in arterial function observed in African Americans (AA). Additionally, this application will facilitate the applicant's emergence as an independent investigator in integrative clinical physiology. Oxidative stress (OS), contributes to hypertension, diabetes, heart failure, atherosclerosis, sepsis and aging. Increased OS leads to the development of endothelial dysfunction and subsequent development of cardiovascular disease through the inactivation of nitric oxide (NO) by superoxide (O2) and other free radicals. African Americans (AA) have increased OS and inflammation in vivo and in vitro, and have a lower serum concentration of most antioxidants. Endothelial cells of AAs have steady state NO/ O2/ONOO- balance that is close to redox state, which is a characteristic of endothelium impaired function disorders. Endothelium-derived NO is a vasodilator and inhibits monocyte adhesion and platelet activity and therefore is important in the maintenance of vascular homeostasis. These specific differences in OS could be a contributing mechanism to the high prevalence of cardiovascular disease, especially hypertension and heart failure, observed in AA. Aging causes increases in OS, endothelial dysfunction, and decreased arterial compliance, thus increasing the risk of cardiovascular disease. Acute supra-physiological dosages of antioxidants have been shown to transiently restore endothelial function in older adults and patients with coronary artery disease and hypertension by scavenging free radicals.However, it is unknown if acute antioxidant supplementation can diminish differences in vascular function between AA and Caucasians (CA). It is also unknown if acute antioxidant supplementation with known efficacy will differentially affect blood flow in AA vs CA during exercise.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Placebo | Placebo Comparator | Placebo will be ingested in front of laboratory personnel in two doses, separated by 30 minutes to increase absorption, consumed 90 and 60 minutes before the testing protocol. Placebo microcrystalline cellulose capsules will be of similar taste, color and appearance. |
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| Antioxidant | Experimental | Supplementation will be ingested in front of laboratory personnel in two doses, separated by 30 minutes to increase absorption, consumed 90 and 60 minutes before the testing protocol. The first dose will consist of 300 mg of α-lipoic acid, 500 mg of vitamin C, and 200 IU of vitamin E, and the second dose will be 300 mg of α-lipoic acid, 500 mg of vitamin C, and 400 IU. of vitamin E. |
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| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Antioxidant | Dietary Supplement | Comparison of antioxidant supplementation with a placebo. Effects of race and age and race in repsonse to the supplementation will be evaluated. |
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| Measure | Description | Time Frame |
|---|---|---|
| Arterial stiffness | The overall aim of this study is to examine the effects of an acute dose of an antioxidant cocktail on arterial stiffness (measured by ventral pulse wave velocity) in younger and older African Americans in comparison to younger and older Caucasians. | 2 weeks |
| Arm blood flow | A second primary outcome is arm blood flow at rest and during two different intensities of hand grip exercise | 2 weeks |
| Endothelial function | A third primary outcome is endothelial function assessed through brachial artery flow mediated dilation. | 2 weeks |
| Measure | Description | Time Frame |
|---|---|---|
| Blood pressure | Both brachial and central blood pressure will be measured as secondary outcomes. | 2 weeks |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| Bo Fernhall, Ph.D. | University of Illinois at Chicago | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Illinois - Chicago | Chicago | Illinois | 60612 | United States |
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| ID | Term |
|---|---|
| D000975 | Antioxidants |
| D014810 | Vitamin E |
| D001205 | Ascorbic Acid |
| D008063 | Thioctic Acid |
| ID | Term |
|---|---|
| D001685 | Biological Factors |
| D045504 | Molecular Mechanisms of Pharmacological Action |
| D020228 | Pharmacologic Actions |
| D020164 | Chemical Actions and Uses |
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| Placebo | Other | Comparison of antioxidant supplementation with a placebo. Effects of race and age and race in repsonse to the supplementation will be evaluated. |
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| D020011 | Protective Agents |
| D045505 | Physiological Effects of Drugs |
| D020313 | Specialty Uses of Chemicals |
| D001578 | Benzopyrans |
| D011714 | Pyrans |
| D006573 | Heterocyclic Compounds, 1-Ring |
| D006571 | Heterocyclic Compounds |
| D006574 | Heterocyclic Compounds, 2-Ring |
| D000072471 | Heterocyclic Compounds, Fused-Ring |
| D013400 | Sugar Acids |
| D000144 | Acids, Acyclic |
| D002264 | Carboxylic Acids |
| D009930 | Organic Chemicals |
| D006880 | Hydroxy Acids |
| D002241 | Carbohydrates |
| D013876 | Thiophenes |
| D013457 | Sulfur Compounds |
| D003067 | Coenzymes |
| D045762 | Enzymes and Coenzymes |
| D005227 | Fatty Acids |
| D008055 | Lipids |