EFFECT OF FLUID INTAKE ON PLASMA VOLUME, OSMOLALITY DURING SWIMMING TRAINING

1.大强度游泳训练中液体摄入量对血液量、渗透压、体温和运动能力的影响8名大学生游泳运动员在参加本研究前提供了知情同意书。受试者进行了一组20次重复的50米游泳，每次间隔1分钟，在两种液体摄入条件下(随意，不摄入液体)。自由活动条件下的体温差值小于不摄入液体条件下的体温，但两种条件下的体温差异无统计学意义；自由活动条件下的平均游泳时间与不摄入液体条件下的平均游泳时间有显著差异。结论：1.间歇性游泳训练期间的液体摄入可以保持较高的运动成绩并抑制体温，尽管两种液体摄入策略在血浆容量和渗透压变化上没有显著差异。对游泳运动员和陆上训练运动员的热汗反应进行了比较。在26ﾟC和33%Rh的气候室中，通过在热水浴(43ﾟC)中浸泡30分钟来对腿部施加热负荷。游泳运动员的出汗时间明显长于其他运动员，但组间和出汗部位之间无显著差异。两组患者胸腔和腹部的出汗量均明显大于大腿和手臂。各地区游泳运动员的局部出汗量均小于其他运动员，组间差异显著。

1. The effect of fluid intake on plasma volume, osmolality, body temperature and performance during intense swimming training.Eight male college swimmers gave informed consent documents before participating in this study. The subjects did a set of 20 repeated 50 m swims on a 1 minute interval in two fluid intake conditions (ad libitum, no fluid intake). The difference of body temperature at ad libitum conditions was smaller than at no fluid intake condition, but there was no significant differences between both conditions .The mean swimming time was significantly difference between ad libitum and no fluid intake. In conclusion, fluid intake during interval swimming training may keep performance high and suppress body temperature, though there is no significant differences in plasma volume and osmolality changes between two fluid intake strategies.2. The thermal sweating responses in swimmers.Thermal sweating of swimmers and other athletes trained on land were compared. Heat loads were applied to legs by immersion in a hot water bath (43ﾟC) for 30 minutes in a climate chamber at 26ﾟC and 33% rh. The sweat onset time in the swimmers was longer than that in the other athletes, but there were no significant differences between the groups or the sweat regions. The sweat volumes from the chest and abdomen were significantly larger than those from the thigh and arm in both group. For all regions, the local sweat volumes in the swimmers were smaller than those of the other athletes, the differences between groups were significant.