暑熱曝露後の血清マグネシウム

Sweat loss and changes in serum content of minerals at heat exposures were detected in six male volunteers. They sat once in the sauna chamber of high temperature, and once in that with infrared heaters for 30 min at separate days, respectively. Blood was sampled before, just after, and one hour after heat exposure. Sweat was also sampled. Sweat loss of minerals and changes in serum mineral contents were determined with atomic absorption spectrophotometry. It was shown that maenesium (Mg) was the sole mineral whose content in serum was decreased after heat exposure, and that sweat loss of Mg during heat exposure was not so much as was reported elsewhere. This suggested that heat exposure increased peripheral circulation and some of serum Mg entered into intracellular spaces, as was reported after mild physical exercise

ZINC, IRON AND ELECTROLYTE CONCENTRATIONS IN SWEATS SECRETED BY THERMAL STIMULATION AND BY PHYSICAL EXERCISE

Zinc is an important essential element. The role of this element in human beings has been well established. It is necessary to take required amount form the daily diet. However, we also have recognized that remarkable amount of zinc is excreted through the skin, which often exceeds daily urinary excretion. The present study was undertaken to investigate whether any difference of zinc concentration was found in the sweats between perspired by thermal stimulation and secreted by physical exercise

日本人青年女子におけるマグネシウムの出納

Human magnesium (Mg) requirement was studied using four human balance studies, whose dietary Mg intake levels were between 160 mg/day and 400 mg/day. At the experiment whose dietary Mg intake was 160 mg/day, intake and output of Mg were equibrated, and no obvious body retention of Mg was observed. At other experiments, whose dietary Mg levels were more than 170 mg/day, body retention of Mg were obviously recoenized. It was assumed that minimum requirement for Mg in Japanese young weman was 160 mg/day. Daily urinary Mg excretion levels at each experiment were almost the same among the four experiments. At the 160 mg/day experiment, the urinary Mg excretions of subjects showed marked inverse correlation to the fecal Mg excretions. These suggested that intestinal absorption of Mg played the most important role in Mg metabolism at low dietary Mg level in man