Changes and significance of physiological indexes in 24-hour marine survival training at sea
Objective To explore the changes of physiological indexes in 24-hour marine survival training,and to provide a reference for exploring health protection methods for marine survival training.Methods Sixteen soldiers well-trained in aviation lifesaving were selected from an Air Force base.They were divided into the morning group(9:00)and the afternoon group(18:00)according to the time of skydiving into the water.Body composition,blood pressure,and urine routines were measured before and after 24-hour marine survival training.The physiological changes of diet,water intake,urine outputs,body temperature,and heart rate were recorded.Results After marine survival training,weight,FFM,muscle mass,tobal body water,tobal body water ratio and BMI of the sixteen soldiers decreased(t=5.555～18.944,all P＜0.001)while body fat ratio(t=3.330,P=0.005),systolic blood pressure and diastolic blood pressure(t=5.393,3.706,P＜0.001,=0.002)increased.The changes of urine were abnormal in four subjects.There were no statistically significant differences in body composition,blood pressure,urine pH or urine specific gravity between the morning and afternoon groups before and after training(P＞0.05).During the marine survival training,the lowest dietary intake was 36.5 g while the highest was 292.0 g.Two of the subjects drank no water,the highest water intake was 500 ml among the rest.The urine outputs ranged from 500 to 3 000 ml.Rash and skin pruritus were found in eleven subjects.The average axillary body temperature of the morning group was higher than that of the afternoon group totally in the water.The average heart rate of the morning group was lower than that of the afternoon group.There was statistically significant difference between the morning and afternoon groups in axillary temperature and heart rate that changed with the length of time in the water(F=18.456,29.114,P=0.005,0.001).Conclusion During the 24 hours of marine survival training,body temperature and heart rate were relatively stable.After training,the subjects lost weight,total body water decreased,and skin discomfort was common,which can provide a reference for aeromedical support for marine survival training.
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