雷达作业人员昼夜不同作业班次心率和心率变异性的变化

目的 观察雷达作业人员作业过程中心率和心率变异性的昼夜节律变化.方法 以某雷达部队21名男性雷达作业人员为对象,于昼夜不同作业班次（上午班、下午班、小夜班和大夜班）上班前佩带＂飞行员飞行生理参数记录检测仪＂,检测工作过程中动态心电图、心率等指标,分析有关心率变异性参数的变化.此外,将每一作业班次分为4个时段,比较同一班次不同时段平均心率的变化.结果 雷达作业过程中不同班次的平均心率有统计学差异（F=7.287,P＜0.01）,大夜班的平均心率较上午班、下午班、小夜班均明显降低（P＜0.01）;大夜班的标化低频功率较上午班、下午班明显降低（P＜0.05）,而标化高频功率较上午班、下午班显著增加（P＜0.05）.上午班、下午班和小夜班不同时段的平均心率均有统计学差异（F=5.480、3.150、3.850,P＜0.05或P＜0.01）,而且均呈现随着作业时间延长,平均心率逐渐降低的趋势;但大夜班中各时段间的平均心率无统计学差异.结论 生物节律的变化对雷达作业人员的心率和有关心率变异性指标产生明显影响.

Changes of heart rate and heart rate variability on radar operators in different shifts

Objective To investigate the circadian changes of heart rate (HR) and heart rate variability (HRV) on radar operators in day and night shifts. Methods Twenty-one military radar operators were selected as subject. Their HR was gotten from continually electrocardiogram recorded by a biomedical monitoring system in four different working shifts (morning, afternoon, early night and late night) and HRV was analyzed. In addition, each shift was divided into four phases and the average HR of different phases in same shift was compared. Results There was significant difference of average HR among four shifts (F=7. 287, P＜0.01). The average HR in late night was significantly lower than that in other three shifts. Comparing with morning and afternoon shifts, high frequency normalized unit (HFNU) in late night shift was significantly increased (P＜0.05). Low frequency normalized unit (LFNU) in late night shift was significantly decreased comparing with those in morning and afternoon shifts (P＜0. 05). The average HR in different phase of a shift showed significant differences among morning, afternoon and early night shifts (F= 5. 480, 3. 150, 3. 850,P＜0. 05 or P＜0. 01), and gradually decreased with working time. However, there was no significant difference of average HR in different working phase of late night shift. Conclusions Circadian change would significantly influence the HR and some HRV indices of military radar operators.