We have conducted an experimental study, in the form of both laboratory experiment and field study, with a view to investigating what kinds of injuries the rural people of Tb-hoku District suffer from especially in such places among the mountains as Shinshu, during the coldest season, and to knowing how it may be improved by the introduction of stoves into their family life. As the field we chose Saguchi-buraku, Yachiho-mura, Minami Saku-gun, Nagano Prefecture (a small village 800 meters above the sea). And for the purpose of the experiment we divided the 27 families who were living solely on farming into two groups, one group provided with stoves and the other, the control group, without stoves.a) In the laboratory experiment, the laboratory was kept at 2°-4°C., same as the room temperature in the farm-houses in the coldest season in that district. In this experiment we have obtained the same results as those published in our previous reports on coldness and cold injury, that is, we evidenced such acute cold injuries as the rise of blood pressure, increase of pulse rate, etc., and also such other injuries as the increase of blood sedimentation rate, appearance of blood “sludging” phenomenon of conjunctive bulbi, etc. By staying in the laboratory at 4°C. only for half an hour, the patients with coronal artery sclerosis showed unfavourable changes in ECG findings.b) As mentioned above, we selected 27 families of similar composition, of annual income and of farming scale, from an tig those of Saguchi-buraku who are living solely on farming, and then divided these 27 amilies into two groups, one group provided with stoves (15 families) and the other without them, a control group. Thereupon, all the family members were examined several times, before, during and after the coldest season, as to their physical and mental conditions. It was a matter for regret that the stoves were provided only for two months of the coldest season, but we have succeeded in obtaining some promising results that would corroborate the good effects of stoves on farmers life.1) The results of various physical examinations carried out before and after the coldest season (blood pressure determination, electrocardiogram, phenol red test, blood sedimentation rate, capillary fragility test, gastric juice examination, eye-ground pictures, pressure of arteriae centralis retinae, cold pressure test, blood flow over conjunctiva bulbi, etc.) failed to show satisfactorily convincing difference between the two groups. It may be because the favourable effects on health, which stoves would have produced during the established period, had been blurred once the season was over. However, the fact that the aggravation of eye-ground pictures was definitely less frequent in the subject group than in the control group is considered to be the result worth special mentioning. On the other hand, it was distressing to population, esp. those over 40 years old, who lived in the ordinary stoveless houses during the coldest season.2) Besides, the personal interviews conducted in the midst of the coldest season drew out attention to the marked decrease of neurological symptoms in the subject group. Furthermore, such favourable effect continued to spring time. Another good effect was that the family began to have a happy circle, esp. around the stove.Moreover, in the subject group it has been proved that winter diseases esp. the cases of common cold decreased to less than one third. When we think of the saying “Common cold opens the gate to all diseases.” this fact may also be consideredtobean important good effect.
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