Thirteen healthy, untrained females whose ages varied between 37 and 44 years walked a distance of 26km rapidly on a summer day under extremely increment weather condition. Upon analyzing and reviewing anthropometrical measures, body composition, pulse rates, blood pressure and blood and urine test results, of eight subjects who successfully completed the exercise in 4 hours and 30 minutes, and of five other subjects who ceased exercise after 4 hours completing 20km walking, the followings were found.
1) No significant differences in after exercise effect of heart rates. In the meantime, mean systolic blood pressure of the 26 km-walking group decreased from 131.5 mmHg at early morning fast period to 116.3 mmHg right after exercise, while the value showed no changes in the 20 km-walking group.
2) The degree of increase in free fat acid (FFA) while was quite significant, was greater among 26 km walking group subjects than 20 km group. The changes in FFA recordings were considered to be indicative of active effort exerted for exercise.
3) The amount of triglycelide seemed to decrease more as the time length of exercise was greater, though no correlating trend with exercise intensity.
4) The amount of choresterole was observed not to be affected by exercise of less than 8 hours long.
5) From the urine test result, exercise intensity was suggested to be greater in 26km walking group than 20 km group, while harmful stress was estimated to be stronger in 20 km walking group than 26 km group.
6) The 20 km walking group was more influenced by blood thickening effect, increased LDH value more and showed greater decrease in blood sugar level.
7) Rate of body fat among healthy middle-aged women was expected to be between 25 abd 28 per cent.