A comparative study was made on bathing-induced changes in body temperature, blood pressure, pulse rate and tissue blood flow of 12 healthy adults using tap water and artificial CO₂ water at 37°C to clarify the physiological effects of CO₂ at various concentrations of 0, 100, 300, 600, 800 and 1000ppm. There was no change in body temperature during bathing in either water, whereas blood pressure and pulse rate were similarly decreased during bathing, but either of these decreases was not significantly different between tap water and CO₂-water. Therefore, it seemed that the decrease in blood pressure due to vasodilation during bathing would be controlled through some regulatory system like autonomic nerve system not so as to result in too much decrease. But, tissue blood flow was more increased during bathing in CO₂-water than tap water, suggesting that blood circulation in the tissue near skin surface would have been more enhanced by bathing in hot CO₂-water, resulting in a decrease of blood pressure.
Since the increase in tissue blood flow during bathing was dependent on the concentration of CO₂, it seemed that an improvement of tissue circulation and metabolism would have resulted from venous return increase associated to venous dilatation, one of dose-dependent CO₂ effects.

To examine relationship between the family composition and medical expenses for circuration diseases in the elderly people who were 65 or more, we analysed the 1982 and 1983 data of medical expenses of national health insurance in the rural area of Fukuoka Prefecture.
The elderly people were classified into five groups according to whether they were living with their children and whether their spouse was alive.
The results were as follows:
1) In the elderly people who were living with their children, the medical expenses were low among those living with their spouses and high among those living without.
2) In the elderly people who were not living with their children, the medicalexpenses were low among the elderly men with their spouses and high among the eldrly women without.
3) In the elderly people who were living alone, the elderly men and women had low medical expenses in hospital services and ambulatory services.
4) The medical expenses for circulation diseases were more influenced by the presence of spouses than living with their children.

A study was conducted to investigate the cushioning effects of lower extremity functions on shock attenuation during landing on one leg.
Optical methods were used to investigate the cushioning effects of lower extremity functions, since these facilitated the quantitation of kinematic variables such as angle, change in angle, position, displacement and velocity during the landing. The subjects were 5 healthy students ranging in age from 21 to 24 years. Ground reaction force (GRF) was measured with a force platform. The impact force peaks showed vertical force-time averages for 1 subject landing on one leg or two legs for 10 trials each from a height of 10cm.
The peak/body weight of impact force of GRF upon landing was attenuated by the cushioning effects of the lower extremity functions, i. e. bending of the knee and ankle joints, more effectively on two legs than on one.
Supination and pronation of the ankle joint influenced the impact force peaks, and the results of this experiment demonstrated significant difference between the number of discharge bursts of leg muscles upon landing on one leg and those landing on two, the former being higher.

The symptoms of anemia, decreases in the levels of circulating red blood cells (RBC), hemoglobin (Hb) and hematocrit (Ht) lead to decrease endurance performance, and the risk of anemia increases in female endurance athletes. Although Hb is composed of a large amount of amino acids, the relationships between circulating levels of amino acids and RBC, Hb and Ht in female endurance athletes have not been clarified yet. Thus, the purpose of the present study was to investigate the relationship between circulating levels of amino acids and RBC, Hb and Ht in female endurance athletes. Twenty-four female endurance athletes (19.8 ± 0.2 years) participated in this study. We measured circulating levels of RBC, Hb and Ht from blood. Also, we measured circulating levels of amino acids from plasma by use of comprehensive analysis. The levels of circulating RBC, Hb and Ht in all subjects were within the normal range. We found that circulating taurine levels were significantly correlated with RBC (r = 0.48, p < 0.05), Hb (r = 0.44, p < 0.05) and Ht (r = 0.42, p < 0.05) in female endurance athletes. In the present study, we demonstrated that circulating taurine levels were significantly associated with RBC, Hb and Ht in female endurance athletes. These results suggest that circulating taurine levels may be a predictor of anemia and treatment strategy for anemia.