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目的探讨跨时区飞行生理负荷的一种评价方法。方法采用２４ｈ动态心电图方法检测１６名北京—美洲、北京—澳洲和北京—欧洲航线飞行飞行员的动态心电图及心率变异性（ＨＲＶ）；另外检测１０名国内昼间飞行飞行员的动态心电图及心率变异性（ＨＲＶ）作对照组。检查指标：①ＨＲＶ的低频功率（０．０４～０．１５Ｈｚ，ＬＦ）；②ＨＲＶ的高频功率（０．１５～０．４０Ｈｚ，ＨＦ）；③ＨＲＶ的总频功率（０．０４～０．４０Ｈｚ，ＴＦ）。计算飞行员ＨＲＶ谱成份的夜间调节指数，算法为：谱成份调节指数＝（夜间值－２４ｈ均值）／２４ｈ均值。用两组飞行员调节指数的差值作为自主神经负荷程度的定量估计。结果①对照组飞行员的ＨＦ反映迷走神经活性在２４ｈ中显示明显的昼夜节律，即夜间ＨＦ增高，ＬＦ降低；白天ＨＦ降低，ＬＦ增高。反映交感神经活性在跨时区飞行组，上述谱成份的昼夜节律性明显降低。②对照组飞行员的ＨＦ夜间调节指数为０．３２±０．１１，而跨时区飞行组ＨＦ夜间调节指数为０．０６±０．０２（Ｐ＜０．０５）。对照组ＬＦ夜间调节指数为－０．０２±０．０８，而跨时区飞行组ＬＦ夜间调节指数为－０．０９±０．０４（Ｐ＜０．０５）。结论跨时区飞行使飞行员ＨＲＶ谱成份的昼?
Objective To explore an evaluation method of physiological load in flight across time zones. Methods The dynamic electrocardiogram (ECG) and heart rate variability (HRV) of 16 pilots in Beijing-America, Beijing-Australia and Beijing-Europe routes were measured by 24-hour ambulatory electrocardiogram. In addition, the dynamic electrocardiogram and heart rate variability of 10 domestic day- (HRV) as control group. Check index: ①HRV low frequency power (0.04 ~ 0.15Hz, LF); ②HRV high frequency power (0.15 ~ 0.40Hz, HF); ③HRV total frequency power (0.04 ~ 0.40Hz, TF). Calculate the night adjustment index of pilot’s HRV spectral components, the algorithm is: spectral component adjustment index = (nighttime value -24h average) / 24h average. The difference between two groups of pilot adjustment indices was used as a quantitative estimate of autonomic nerve burden. Results ① In control group, the HF of pilots showed that vagal activity showed obvious circadian rhythm at 24h, that is, the nocturnal increase of HF and decrease of LF, the decrease of HF during day and the increase of LF. Reflecting sympathetic activity In the cross-time zone flight group, the circadian rhythms of the spectral components were significantly reduced. ② In the control group, the pilot’s HF night adjustment index was 0.32 ± 0.11, while the cross-time zone flight group HF night adjustment index was 0.06 ± 0.02 (P <0.05). In the control group, the nighttime regulatory index of LF was -0.02 ± 0.08, while that of the inter-temporal flight group was -0.09 ± 0.04 (P <0.05). Conclusions Cross-time zone flight enables pilots to use HRV spectral components for daytime