Wenk C, Kuhnt M, Kunz P, Steiner G
Institut für Nutztierwissenschaften, Gruppe Ernährung, ETH Zentrum, Zürich, Schweiz.
Z Ernahrungswiss. 1993 Dec;32(4):301-7. doi: 10.1007/BF01611168.
An estimation of the electrolytic losses through the skin was evaluated in a run over a distance of 10 km on a 400 m Tartan-trac. Na, K, Ca, and Mg excreted by the skin were collected in standardised clothing and thereafter washed out. The remaining electrolytes on the skin were collected by washing the body with deionized water. In addition, the concentrations of hormones and metabolites in blood before and after the race were ascertained. Mean ambiant temperature and relative humidity amounted to 21 degrees C and 35%, respectively. The mean performance was 40.5 min. and the average body weight loss was 1.45 kg. The only significant changes in the serum concentrations were the increases of free fatty acids and glycerol. This can be explained, together with a slight increase of glucose and a decrease of insulin, by a higher sympathoadrenergic activity. In the mean 20 mg calcium, 5 mg magnesium, 200 mg potassium, and 800 mg sodium were lost by the skin per kg body weight loss. Those amounts compared well with corresponding data found in literature. The described method can be proposed for further experiments.
在400米的柏油跑道上进行10公里跑步的过程中，对经皮肤的电解质流失情况进行了评估。通过穿着标准化服装收集皮肤排出的钠、钾、钙和镁，之后将其冲洗掉。用去离子水冲洗身体来收集皮肤上剩余的电解质。此外，还测定了比赛前后血液中激素和代谢物的浓度。平均环境温度和相对湿度分别为21摄氏度和35%。平均成绩为40.5分钟，平均体重减轻1.45千克。血清浓度中唯一显著的变化是游离脂肪酸和甘油的增加。这可以通过交感肾上腺能活性增强，连同葡萄糖略有增加和胰岛素减少来解释。平均每千克体重减轻，皮肤会流失20毫克钙、5毫克镁、200毫克钾和800毫克钠。这些数值与文献中相应的数据相符。所描述的方法可用于进一步的实验。
