Dynamic changes of blood pressure in construction workers moved from plain to high-altitude areas

Objective To investigate the dynamic changes of blood pressure in construction workers who moved from plain to high-altitude areas.Methods Through the design of a special questionaire and training of designated researchers,blood pressure of construction workers who moved from plain to the high-altitude areas was measured during the period.The time points of the measurement were day 0(in plain),and 3,7,15,30 and 60 days after moving to high-altitude areas respectively.Results Significant changes in blood pressure were observed in period.Compared with the blood pressure in plain,the blood pressure was significantly increased on day 3(P0.01) and day 7(P0.05),then gradually decreased to the level close to the plain on day 30.The blood pressure on day 60 was again higher than that in plain and on day 30.The incidence of high-altitude hypertension was 20.2%(202/1 000).The incidence of high-altitude hypertension in workers exposed to high-altitude plateau was significantly higher than that in local workers(P0.01),and the prevalence rate of high-altitude hypertension increased with the increase of the altitude.Conclusion High-altitude hypertension occurs in people who work in high-altitude areas in the sub-acclimatization period and the incidence increases with increased altitude.