Abstract
This is the first experiment to investigate the effect of heat and cold stress on glutathione metabolism in human erythrocytes. We immersed men at three different water temperatures for 10 min. At 39°C, no remarkable changes were observed. Levels of glutathione (GSH) decreased from 2.44 (0.14) to 1.80 (0.10) μmol·ml red blood cells−1 [μmol·ml RBC−1; mean (SEM);P<0.0005] and those of lipid peroxides increased from 1.87 (0.03) to 2.06 (0.04) nmol · ml RBC−1 (P<0.01) after the immersion at 42°C. In contrast, levels of GSH increased from 2.46 (0.17) to 2.91 (0.17) μmol · ml RBC−1 (P<0.05) and those of lipid peroxides did not change after the immersion at 25°C. The activities of glutathione peroxidase decreased from 35.90 (1.83) to 34.33 (1.66) IU · g Hb−1 (P < 0.01) after the immersion at 42°C; however, these activities did not change after the immersion at 25°C. The activities of glutathione reductase (both active and inactive forms) showed no changes at any temperatures. These changes indicate that heat stress causes oxidative stress in the human body; however, cold stress is thought to augment the activity of the antioxidative defence system. It is suggested that body exposure to hot environmental conditions should not be recommended for patients suffering from a damaged antioxidative defence system.
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Ohtsuka, Y., Yabunaka, N., Fujisawa, H. et al. Effect of thermal stress on glutathione metabolism in human erythrocytes. Europ. J. Appl. Physiol. 68, 87–91 (1994). https://doi.org/10.1007/BF00599247
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DOI: https://doi.org/10.1007/BF00599247