1987 年 19 巻 3 号 p. 8-19
We have a lot of reports on anti-resistance index of frostbite so far. Those reports have dealt mainlywith response of the finger blood vessel to cold. In this study we investigated response of the toe bloodvessel to cold.
The subjects consisted of two groups ; Group K……10 men, kendo players who play with naked feet ;Group B……11 men, basketball players who play in their shoes. Measurement was taken twice in autumnand in winter.
Skin temperature of the right toe was taken every minute with the multi-point thermister-thermometerfor 5 minutes just before immersing the toe in the cold water, for 30 minutes during immersing, and forl10 minutes after taking up the toe from the water. And the skin temperature was recorded.
From the change of skin temperature of the toe we read 1) TBI (temperature before water immersion),2) MST (mean skin temperature), 3) TFR (temperature at first rise), 4) TTR (time of temperature rise),5) AT (amplitude of temperature), and 6) TAI (temperature after water immersion). Then we calculatedanti-chilblain index according to the three-point and five-point method by Yoshimura and by Nakamura .
The results are summarized as follows.
1. During immersion in the cold water Group K had a high skin temperature of the toe both in autumnand in winter. And furthermore, only Group K showed a high value of MST in winter significantly (p<0.025).
2. There was no significant difference between Group K and Group B in the skin temperature for 5 minutes before immersion both in autumn and in winter. Nor in TBI was significant difference found.But Group K had a tendency only in winter to show a high value of the skin temperature for 10 minutesafter taking up the toe from the water. Group K also showed a high values of TAI significantly (p<0.005).
3. As to TFR and AT, Group K showed a higher value both in autumn and in winter than Group B did. And the both groups had a tendency to show a higher value of TFR and AT in winter than inautumn. On the other hand, though Group K showed TTR earlier both in autumn and in winter, theboth groups had a tendency to show TTR later in winter than in autumn, It is to be noted that responseof the blood vessel to cold was weaker in winter as regards TTR in contrast to other values measured.
4. Group K showed a higher anti-resistance index of frostbite under every calculating method.However significant difference was found only under the three-point (p<0.025) and five-point (p<0.01,p <0.005) method by Nakamura which excluded influence of TBI at the time of calculation. Under everymethod anti-resistance index of frostbite was higher in winter than in autumn.