Cold-induced vasodilation and heat-induced vasoconstriction in the fingers of germans and japanese staying in germany.
- VernacularTitle:ドイツ人とドイツ滞在日本人の手指における寒冷血管拡張反応と温熱血管収縮反応
- Author:
MASASHI SUGAWARA
;
AKIHIRO TAIMURA
- Publication Type:Journal Article
- Keywords:
cold-induced vasodilation;
heat-induced vasoconstriction;
laser Doppler flowmetry;
finger blood flow
- From:Japanese Journal of Physical Fitness and Sports Medicine
1997;46(2):221-227
- CountryJapan
- Language:Japanese
-
Abstract:
Cold-induced vasodilation (CIVD) and heat-induced vasoconstriction (HIVC) were examined in 8 Germans who were living in the suburban areas of the central Germany and 7 Japanese who were staying in the suburban areas of central Germany for the mean length of 2.7±0.6 years. CIVD were measured during the middle finger immersion in cold water at 0.2°C for 30 minutes. The finger blood flow for HIVC was measured by laser Doppler flowmetry (LDF) in water from 35°C to 43°C every 10 minutes. HIVC represented as the percentage of the LDF volts after immersing as compared with the values before immersing (finger blood flow %, FBF%) . The daily energy intake of the subjects were also investigated.
The mean skin temperature and the resistance index as a value of CIVD were significantly higher in the Germans than Japanese, but the values of the Japanese living in Germany were higher than those of the Japanese living in Japan. The HIVC appeared at 35°C and 38°C and FBF% was the lowest at 40t both in the Germans and the Japanese. The finger skin temperature increased during jmmersion in both groups but was significantly higher in the Germans at 43°C. The decrease in FBF% per minute and the increase in the finger skin temperature per minute at 38°C and 40°C were greater in the Germans. The increase in FBF% per minute was greater in Japanese but the increase in finger temperature per minute were smaller in Japanese at 43°C. The daily protein intake of the Japanese living in Germany was higher than the average intake of the Japanese living in Japan, and their daily protein intake per body weight was approximately equal to that of the Germans.
It is inferred that CIVD is affected by the living circumstances and the state of nutritional intake, and HIVC by the thermal sensation and also by the living circumstances.
