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NOS3 genotype-dependent correlation between blood pressure and physical activity
Tomomi Kimura1, Tetsuji Yokoyama, Yasuhiro Matsumura
1Department of Molecular Epidemiology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan. kimura.epi@mri.tmd.ac.jp
Hypertension (Dallas, Tex. : 1979)
|February 8, 2003
Summary
Genetic variations in endothelial nitric oxide synthase (NOS3) interact with physical activity to influence systolic blood pressure. This finding may improve hypertension management through personalized exercise recommendations.
Area of Science:
- Cardiovascular Physiology
- Human Genetics
- Exercise Science
Background:
- Endothelium-dependent vasodilation, mediated by nitric oxide (NO) from endothelial nitric oxide synthase (NOS3), is crucial for blood pressure regulation.
- Exercise enhances NO release and is recommended for hypertension management, but individual responses vary.
- Genetic factors may explain differential responses to exercise in blood pressure control.
Purpose of the Study:
- To investigate the interaction between NOS3 genetic polymorphisms and physical activity levels on blood pressure.
- To determine if NOS3 genotype influences the effectiveness of physical activity in managing systolic blood pressure and hypertension.
Main Methods:
- Genotyping of 832 healthy Japanese individuals for the NOS3 intron 4 (ecNOS4a/b) polymorphism using polymerase chain reaction.
- Assessment of habitual physical activity levels via semiquantitative interview based on energy expenditure relative to resting metabolic rate.
- Statistical analysis to evaluate the interaction between genotype and physical activity on systolic blood pressure and hypertension prevalence.
Main Results:
- A significant inverse correlation between systolic blood pressure and physical activity was observed only in subjects with the rarer 'a' allele of the NOS3 polymorphism (aa+ba types).
- The NOS3 polymorphism was significantly associated with systolic hypertension prevalence, specifically in individuals with the lowest physical activity levels (OR=2.4).
- A significant interaction effect was detected between NOS3 genotype and physical activity level on systolic blood pressure.
Conclusions:
- A significant interaction exists between NOS3 genotype and physical activity level in modulating systolic blood pressure.
- These findings suggest that genetic predisposition may influence the blood pressure-lowering effects of exercise.
- Understanding this gene-environment interaction could lead to personalized strategies for hypertension prevention and cardiovascular disease risk reduction.