| （1.Physical Education of PLA，Guangzhou 510500，China；2.Second Military Medical University，Shanghai 200438，China；3.Xi’an Communication Institute of PLA，Xi’an 710706，China） Abstract: The authors tried to reveal the adaptation of the body exercising in a hot and humid environment through an experiment studying the characteristics of changing of blood constituents of the body in a hot and humid envi-ronment, so as to provide corresponding theoretical criteria for training. The authors selected 30 males students with an average age of (21.3±1.1) randomly from a university. The experiment was done in the hot and humid environ-ment training laboratory of Second Military Medical University, where the ambient temperature was controlled to 39 ℃, the relative humidity was 80%. The experiment lasted 9 d, which were divided into a testing stage and a training stage; at the testing stage, a 12 min speed bike test was run 1 d before and after training respectively; before and after the two tests, venous blood was taken from upper limbs (immediately after rectal temperature index was tested); the cycle of the training stage is 7 d, the exercising loads were 15 min of hand free walking on a treadmill, 15 min of resistance free exercising on a model BC4730-52 EVERE speed bike, 15 min of exercising on a model BC8500 EVERE speed bike which was adjusted to 10LEVEL-280WATT/H. The results showed the followings: as compared with the results before the first and second tests, blood urea (BU), lactic acid (La), [K+] and [Ca2+] after the two tests increased significantly (P<0.05), [Cl-] decreased significantly (P<0.05); [Na+] increased significantly (P<0.05) after the second test; after 7 days of heat acclimatization training, as compared with the results before the first test, BU and [Na+] before the second test increased significantly (P<0.05), La concentration decreased signifi-cantly (P<0.05); as compared with the results after the first test, BU, [Na+], [K+] and [Ca2+] after the second test in-creased significantly (P<0.05). The results indicated the followings: after 7 d of intermittent, repeated heat exposure exercising, the body’s protein metabolism and energy supply decreased somewhat; La removing ability was en-hanced; various indexes in blood electrolyte changed to different extents, but they were all in range of normal physiology and the range tolerable to the human body; and the exercising ability and self perception were improved, which indicates that heat acclimatization training is conducive for the body to establish a new dynamic stereotype of thermal reaction.
Key words: sports biochemistry；hot and humid environment；exercising；serum；heat stress；heat acclimatization |
