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目的:探讨吸入液氧对高原人体运动心力储备的影响。方法:在海拔3700m和5400m高原,分别对10名健康青年携1.5m3单兵液氧灌吸氧(吸氧组,4L/min)速跑,其中海拔3700m进行400m和1600m,海拔5400m进行200m,并与携罐不吸氧(常氧组)时比较。速跑前后采用心力监护仪采集和记录心动周期和心力信息,把完成规定运动量运动后第一心音(S1)幅值对安静时S1幅值增加的相应倍数评估心肌收缩能力储备指数(CCRI);利用舒张期和收缩期时限数据计算舒张期/收缩期比值(D/S比)。结果:速跑运动后较运动前HR、S1均增高,差别有非常显著性(P<0.01);常氧组D/S增高,差别有显著性(P<0.05)。吸氧组运动后较常氧组CCRI、S1增高,差别有显著性(P<0.05或P<0.01)。结论:高原低氧环境下运动机体心脏储备主要是心肌收缩能力储备而不是心率储备。吸入液氧可增强机体心力储备能力,为进入高原途中卫勤保障及高原边防巡逻等带来有利的安全保障。
Objective: To investigate the effect of inhaled oxygen on the cardiopulmonary reserve in high altitude. Methods: Ten healthy youngsters were enrolled in this study. Ten healthy youngsters were enrolled in the study. The altitude of 3700m and 5400m were respectively 400m and 1600m, elevation of 5400m and height of 4m / And compared with carrying cans without oxygen (normoxia group). Before and after speed running, the heart monitor was used to collect and record the heart cycle and heart rate information, and the myocardial contractility reserve index (CCRI) was evaluated by multiplying the amplitude of the first heart sound (S1) The diastolic / systolic ratio (D / S ratio) was calculated using the diastolic and systolic time frames. Results: Compared with pre-exercise HR and S1, the difference was significant (P <0.01). The D / S in normoxia group was significantly higher (P <0.05). Compared with the normoxia group, CCRI and S1 in the oxygen inhalation group increased after exercise, the difference was significant (P <0.05 or P <0.01). CONCLUSION: Cardiac reserve is mainly myocardial contractile reserve rather than heart rate reserve in the plateau hypoxic environment. Inhaled liquid oxygen can enhance the body’s ability to reserve the heart, to enter the plateau way health services and plateau border patrols and other favorable safety and security.