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• W2129690007 abstract "BackgroundDisturbances of heart rate variability (HRV) may represent one pathway by which second-hand smoke (SHS) and air pollutants affect cardiovascular morbidity and mortality. The mechanisms are poorly understood.ObjectivesWe investigated the hypothesis that oxidative stress alters cardiac autonomic control. We studied the association of polymorphisms in oxidant-scavenging glutathione S-transferase (GST) genes and their interactions with SHS and obesity with HRV.MethodsA total of 1,133 nonsmokers > 50 years of age from a population-based Swiss cohort underwent ambulatory 24-hr electrocardiogram monitoring and reported on lifestyle and medical history. We genotyped GSTM1 and GSTT1 gene deletions and a GSTP1 (Ile105Val) single nucleotide polymorphism and analyzed genotype–HRV associations by multiple linear regressions.ResultsHomozygous GSTT1 null genotypes exhibited an average 10% decrease in total power (TP) and low-frequency-domain HRV parameters. All three polymorphisms modified the cross-sectional associations of HRV with SHS and obesity. Homozygous GSTM1 null genotypes with > 2 hr/day of SHS exposure exhibited a 26% lower TP [95% confidence interval (CI), 11 to 39%], versus a reduction of −5% (95% CI, −22 to 17%) in subjects with the gene and the same SHS exposure compared with GSTM1 carriers without SHS exposure. Similarly, obese GSTM1 null genotypes had, on average, a 22% (95% CI, 12 to 31%) lower TP, whereas with the gene present obesity was associated with only a 3% decline (95% CI, −15% to 10%) compared with nonobese GSTM1 carriers.ConclusionsGST deficiency is associated with significant HRV alterations in the general population. Its interaction with SHS and obesity in reducing HRV is consistent with an impact of oxidative stress on the autonomous nervous system." @default.
• W2129690007 created "2016-06-24" @default.
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• W2129690007 date "2008-11-01" @default.
• W2129690007 modified "2023-09-29" @default.
• W2129690007 title "Glutathione <i>S</i> -Transferase Polymorphisms, Passive Smoking, Obesity, and Heart Rate Variability in Nonsmokers" @default.
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• W2129690007 doi "https://doi.org/10.1289/ehp.11402" @default.
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