目的 比较伞降训练时着两型伞兵保障系统的人体应激反应程度. 方法 20名空降兵按随机数字表随机分为两组(每组n=10),分别着A、B型伞兵保障系统进行跳伞和着陆后约30 min的战术演练.动态监测试验日基础状态、跳伞前、跳伞及着陆、战术演练过程中的过载值、心率和体表温度,对试验日基础状态、跳伞前、着陆后等阶段的尿液进行分析,采用自认疲劳分级量表进行跳伞前后的主观疲劳感自评. 结果跳伞不同阶段的载荷值有明显变化.与基础值相比,两组跳伞前,尤其是开始跳伞时、着陆时及演练中的最大心率均显著增加(tA=3.75～19.54,tB=5.66～20.71,P<0.01);跳伞前、后的尿比重降低(tA=4.02、2.77,tB=2.76,P<0.01);着陆后至展开、战术演练等阶段的疲劳评分明显升高(tA=3.34、4.90、2.89,tB=3.90、4.46、2.90,P<0.01).以上指标两组间无明显差异.但B组跳伞中和着陆后的胸部体表温度均明显高于A组(t=3.99、2.94,P<0.05). 结论在伞训期间着两型伞兵保障系统人体的应激反应程度大体相似,但B型的热负荷大于A型,在湿热季节着B型伞兵保障系统的热负荷问题值得进一步观察.“,”Objective To compare the human stress reactions during parachuting training when dressed two kinds of protective system of paratroops. Methods Twenty paratroopers were served as subjects. They were randomly divided into two groups (n= 10) and respectively dressed A and B types of protective systems of paratroops for parachuting training and performing tactical exercise for approximate 30 rain after landing. The G load, heart rate and temperature of chest skin were recorded continuously during the parachuting and tactical exercise after landing. The urine samples of baseline, before parachuting and after landing were analyzed. The subjective fatigue feelings at different stages were evaluated by using Rating of perceived exertion(RPE) scale. Results G load was significantly changed along with the process of parachuting. Compared with the baseline, the maximal heart rates at these stages(before parachuting, just jumping, after landing and tactical exercise) were significantly increased(tA =3.75, 4. 90, 19.54, tB=5.66, 4.46, 20. 71, P<0.01). Compared with the baseline, the specific gravity was decreased before and after parachuting (tA = 4.02, 2.77, tB=2.76). Compared with the baseline the RPE scores were enhanced after landing and performing tactical exercise (tA = 3.34, 4.90, 2.89, tB = 3.90, 4.46, 2.90, P< 0.01). However, there were no significant differences of these indices between two groups. Temperature of chest skin in group B was significantly higher than that in group A during parachuting and after landing(tA = 3.99, 2.94, P< 0.05). Conclusions The stress reactions during parachuting training are grossly similar when dressed two kinds of protective system of paratroops ; but the heat stress in group B is higher than that in group A.