Blood pressure as an indicator for health supervision is frequently used in fi eldsfo industrial and community health. Considering the specific factors in daily life of the Japanese, blood pressure in squatting posture with abdominal pressure is specially interested. The present study was made to add some available information as to the behaviour of changes in blood pressure due to postural change for the assessment of health control programme for the Japanese. Seven hundred and f ortyifive adults working at a department-store and belonging to a nursing home were investigated on blood pressure in order to study fluctuation due to postural change from sitting to squatting. Eighty workers from the group of the department-store were also examined for the variation of blood pressure under the condition of abdominal pressure in addition to postural change. Data obtained were classified and analyzed in terms of sex, age, obesity, and maximum and minimum blood pressure by means of regression analysis. The results reached were as follows: 1) In the squatting posture, maximum and minimum blood pressure increased with statistically significant difference in both sexes, as compared with those in the sitting posture. Through regression analysis, the grade of regression was found as high in case of the minimum blood pressure among obese middle- and older-aged persons either in regression coefficient or regression line. 2) Values of blood pressure showed a tendency to increase in the order of sitting, squatting, and squatting with abdominal pressure. 3) Values of blood pressure in squatting posture with abdominal pressure showed a remarkable increase in comparison with blood pressure in sitting posture. A regression analysis revealed that grade of the regression was particularly high in case of obesity group both in regression coefficient and regression line.
