Abstract:
PURPOSE:An elevated systolic blood pressure (SBP) response to a graded maximal exercise stress test (GEST) may be a predictor of endothelial dysfunction and hypertension. We examined relationships among the GEST peak SBP response and indicators of endothelial function. METHODS:Men (n=48, 43.7±1.4 yr) with high BP (145.1±1.5/85.5±1.1 mmHg) completed a GEST. Peak SBP was the highest SBP achieved during the GEST. Blood samples were taken for fasting glucose and insulin, nitric oxide (NO), and DNA. Endothelial nitric oxide synthase (NOS3, rs2070744) -786 T>C genotyping was determined by PCR. NOS3 genotypes were combined using a dominant model [TT (n=24); TC/CC (n=24)]. Brachial artery reactivity (BAR) was determined via ultrasound before, 1 min, and 3 min post occlusion and calculated as % change. Analysis of variance (ANOVA) tested changes in the peak SBP GEST response by NOS3 genotype. Multiple variable regression analyses examined relationships among the GEST peak SBP response and measures of endothelial function. RESULTS:%BAR change at 1 min (r(2)=0.093, p=0.020), glucose (r(2)=0.062, p=0.014), NOS3 -786 T>C (r(2)=0.040, p=0.024), NO (r(2)=0.037, p=0.064), and age (r(2)=0.009, p=0.014) explained 24.1% of the GEST peak SBP response (p=0.043). The GEST peak SBP change from baseline was 11.1±5.0 mmHg higher among those with the NOS3 C allele (92.4 mmHg+3.8) than the NOS3 TT genotype (81.3 mmHg+3.2) (p=0.03). CONCLUSION:Indicators of endothelial function appear to explain a clinically significant portion of the GEST peak SBP response. Further investigation is needed to unravel the mechanisms by which endothelial function influences the GEST peak SBP response.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Olson KM,Augeri AL,Seip RL,Tsongalis GJ,Thompson PD,Pescatello LSdoi
10.1016/j.atherosclerosis.2012.01.027subject
Has Abstractpub_date
2012-05-01 00:00:00pages
202-7issue
1eissn
0021-9150issn
1879-1484pii
S0021-9150(12)00060-3journal_volume
222pub_type
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