Plasma nitrite response and arterial reactivity differentiate vascular health and performance

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Allen, Jason, Miller, Elizabeth M, Schwark, Earl, Robbins, Jennifer L, Duscha, Brian D and Annex, Brian H (2009) Plasma nitrite response and arterial reactivity differentiate vascular health and performance. Nitric Oxide: Biology and Chemistry, 20 (4). pp. 231-237. ISSN 1089-8603

Abstract

NO is crucial for endothelial function and vascular health. Plasma nitrite (NO2−) is the main oxidation product of NO and has been shown to reflect changes in eNOS activity. We hypothesized that plasma NO2− response to physical exercise stress along with physiological endothelial function would be reduced with increasing severity of vascular disease. Subject groups were: (a) risk factors but no vascular disease (RF); (b) Type 2 diabetes with no vascular disease (DM); (c) diagnosed peripheral arterial disease (PAD); and (d) DM + PAD. Venous blood was drawn at rest and 10 min following maximal exercise. Plasma samples were analyzed by reductive chemiluminescence. Brachial diameters were imaged prior to, during and following 5 min of forearm occlusion (BAFMD). There were no differences in resting plasma NO2− or BA diameters between groups. The PAD groups had lower age adjusted BAFMD responses (p ⩽ 0.05). Within group analysis revealed an increase in NO2− in the RF group (+39.3%), no change in the DM (−15.51%), and a decrease in the PAD (−44.20%) and PAD + DM (−39.95%). This was maintained after adjusting for age and VO2peak (p ⩽ 0.05). ΔNO2− and BAFMD were the strongest independent predictors of VO2peak in multivariate linear regression. These findings suggest ΔNO2− discriminates severity of cardiovascular disease risk, is related to endothelial function and predicts exercise capacity.

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Item type Article
URI https://vuir.vu.edu.au/id/eprint/25758
DOI https://doi.org/10.1016/j.niox.2009.01.002
Official URL http://www.sciencedirect.com/science/article/pii/S...
Subjects Historical > FOR Classification > 1101 Medical Biochemistry and Metabolomics
Historical > FOR Classification > 1106 Human Movement and Sports Science
Current > Division/Research > College of Sports and Exercise Science
Keywords endothelium, nitric oxide, plasma nitrite, cardiovascular disease, exercise, VO2peak
Citations in Scopus 53 - View on Scopus
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