[Relationship between high sodium diet and hypertension and results of intervention in high sodium diet population].

An epidemiologic survey of the morbidity and mortality rates of hypertension and related disease was carried out in a population of 9,570 composed of salt workers and building workers. The survey rate was 96.59%. The age-standardized morbidity rate of hypertension in the salt workers was 27.88%, while that in the building workers was 8.5%. Na concentration and Na/K rate in 8 hrs' nighttime urine in salt workers were significantly higher than in building workers (P less than 0.001). Results of intervention of salt intake at the level of 10 g/person/day in 285 cases of hypertensives for 3 months showed that mean levels of systolic pressure and diastolic pressure decreased by about 3.1 kPa (P less than 0.001) and 1.9 kPa (P less than 0.01) respectively; the mean body weight decreased by about 2.2 kg; Na concentration in 8 hrs' nighttime urine and its Na/K radio significantly decreased (P less than 0.001), while K Concentration increased. The situation of high level of Na and low level of K in human body was obvious on long-term high sodium diet population. Intervention of salt intake had considerable effect of depression of both blood pressure and morbidity rate of hypertension in a population.