The purpose of this study is to find the amount of essential activity for the preservation of health. In sixty six women of age group 20 years (20.5±1.5 years old, 55 students) and 30 years (33.3±2.5 years old, 11 housewives) the health scale, the amount of activity in daily life and aerobic work capacity were measured. The results were as follows.
　1. The two dimensional health scales were formed of Positive scale and Negative scale, that made it score the examination of inquiry to evaluation of health level. These scales were divided into nine evaluations, and were recognized the propriety to evaluation of health level by the distribution of score.
　2. Significant relationship between the Negative scale and, PWC 75% HRmax and VO₂max/weight were obtained. And, the aerobic work capacity in Cc-group was lower than the other groups significantly. It was though that the health level in Cc-group was below the lowest limit.
　3. The relation between the two dimensional health scale and the amount of activity was not obtained. But, it was obtained the tendency that the amount of activity in Aa-group was higher than the other groups.
　4. The total energy consumption/weight in daily life was about 36 kcal/kg/day. The base of calculation of this value was the value in Cc-group of PWC 75% HRmax and the lowest limit value (28ml/kg/min) of VO₂max/weight on women's health level. Therefore, it was concluded that the amount of essential activity in women of 20-30age group was 36kcal/kg/day.

DESCENTE SPORTS SCIENCE Vol.8/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE