Migration, blood pressure pattern, and hypertension: the Yi Migrant Study

Area of Science:

• Environmental Health
• Epidemiology
• Genetics and Gene-Environment Interaction

Background:

• Rural-urban migration offers a unique model to study environmental and genetic influences on blood pressure.
• The Yi people in China, residing in a remote mountainous region, were chosen to investigate these effects.

Purpose of the Study:

• To examine the impact of migration on blood pressure trends and hypertension prevalence in the Yi population.
• To compare blood pressure patterns between rural Yi farmers, urban Yi migrants, and urban Han residents.

Main Methods:

• A cross-sectional study involving 14,505 individuals aged 15-89 years in southwestern China in 1989.
• Blood pressure measurements were taken for Yi farmers, urban Yi migrants, and urban Han residents.
• Statistical analysis considered age, body mass index, heart rate, smoking, and alcohol consumption.

Main Results:

• Yi farmer men exhibited the lowest mean blood pressure, slowest age-related increase, and lowest hypertension prevalence.
• Yi migrant men and Han men showed higher blood pressure levels, steeper age-related increases, and greater hypertension prevalence.
• Among women, Yi farmer women had lower age-related blood pressure rise and hypertension prevalence compared to Yi migrant and Han women, despite higher initial systolic pressure.

Conclusions:

• Migration has a significant effect on the age-related rise in blood pressure and the prevalence of hypertension.
• Environmental factors associated with migration play a crucial role, independent of age, BMI, heart rate, smoking, and alcohol use.
• These findings highlight the substantial impact of environmental changes accompanying migration on cardiovascular health.