Author : Melisa Erdal
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (138 download)
Book Synopsis Nitric Oxide Dependence Calculations by : Melisa Erdal
Download or read book Nitric Oxide Dependence Calculations written by Melisa Erdal and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Endothelial microvascular function of skin blood vessels is predictive of the cardiovascular disease risk (Holowatz et al., 2008). This study aims to examine differences in nitric oxide- (NO) dependent vasodilation during 39°C and 42°C local heating protocols and determine if the method of calculating NO contribution influences findings. We hypothesized that NO would contribute more to vasodilation when the skin blood flow (SkBF) values are subtracted (traditional) rather than the contribution value calculated from the percent change (relative). In addition, we hypothesized that older subjects would have reduced NO-dependent vasodilation in both protocols and with both methods of analysis. We conducted a cross-sectional study of 31 young (12 male/19 female, 24 (4) years) and 18 older (5 male/13 female, 68 (7.517)) participants. NO-dependent vasodilation was determined by perfusing (intradermal microdialysis) 15 nM N-nitro-l-arginine methyl ester during the heating plateau of the 39°C and 42°C protocols. Red blood cell flux (laser-Doppler flowmetry) was used to calculate cutaneous vascular conductance (CVC; red blood cell flux/mean arterial pressure), and values were represented as a percentage of maximum (%CVCmax) (28 nM sodium nitroprusside + 43°C). We found that when NO contribution is analyzed with the traditional method, NO contribution was lower in the older group than the young group in the 39°C heating protocol (p=0.030) but not in the 42°C protocol (p=0.262). We also found that NO contribution was lower in the 39°C protocol in the older group (p