空降兵跳伞心理应激对心率变异性的影响

目的观察空降兵跳伞心理应激对心率变异性(HRV)的影响,为评价跳伞心理应激强度提供方法和生理学依据。方法参加跳伞训练的空降兵30名,跳伞当天佩戴飞行员飞行生理参数记录检测仪,连续动态记录跳伞前安静状态下30 min的心电信号,采用与记录检测仪配套的数据分析系统对心率变异性指标进行时域和频域分析,并与跳伞后1个月平时状态下的测量结果对照。结果与对照相比,跳伞前心率变异性时域指标SDNN、RMSSD、HRVI、SDNNindex、SDANN分别降低了32.1%、41.2%、15.0%、14.2%、46.2%,差异有显著性(P0.05);频域指标HF、HFNU、TP分别降低了66.7%、60.1%、25.8%,差异有显著性(P0.05);而LFNU、LF/HF则分别升高了40.3%、335.9%,差异有显著性(P0.01)。结论心率变异性是反映空降兵跳伞心理应激的一个较灵敏指标,可用于评价跳伞应激强度。

EFFECT OF MENTAL STRESS ON HEART RATE VARIABILITY OF THE AIRBORNE FORCES BEFORE A PARACHUTE JUMP

Objective To investigate the effect of mental stress on heart rate variability（HRV） of the airborne soldiers before a parachute jump,so as to provide the way how to use it as an index and to provide physiological evidence for evaluating mental stress.Methods Thirty min RR-interval（RRI） data were collected with pilot physiological parameters recorder from 30 airborne soldiers before the jump.Control measurement was done 1 mo later when the subjects had no known stress factors affecting them.All the RRI data were analyzed by time domain and frequency domain.Results The indices of time domain such as SDNN,RMSSD,HRVI,SDNNindex and SDANN before the jump were reduced by 32.1%,41.2%,15.0%,14.2%,and 46.2% respectively（P〈0.05）;the indices of frequency domain such as HF,HFNU,TP were reduced by 66.7%,60.1%,25.8% respectively（P〈0.05）;whereas LFNU,LF/HF were increased by 40.3%,335.9% respectively（P〈0.01）.Conclusion Heart rate variability could reflect the mental stress of airborne forces,so it may be used as a sensitive index for evaluation of parachute jump-induced mental stress.