目的 探讨正常新生儿心率变异性（HRV）的特点。方法 应用Compas XM Holter分析系统对35例正常足月新生儿进行HRV时域分析。结果 新生儿出生后1～7d与8～28d HRV指标无差异（P＞0.05）。24h正常RR间期标准差（SDNN）、心率变异性指数（HRVI）与24h平均心率（AHR）、最慢心率（MiHR）呈中度负相关（r值分别为-0.44，-0.43，-0.51，-0.56，P﹤.05）。结论 HRV是反映新生儿心脏自主神经功能较稳定的指标，结果可供新生儿HRV研究参考。

Objective To study characteristics of heart rate variability (HRV) in the normal newborns. Methods Compas XM Holter system was used to analyze the time domain of HRV in 35 normal newborns. Results There was no difference in the parameters of HRV and heart rate indexes of newborns in the early period (1～7 d) and later period (8～28 d). There was moderate negative correlation between the standard deviation of all normal RR (SDNN) and the heart rate varibility index (HRVI) and average heart rate and minimum heart rate ( r :-0.44,-0.43,-0.51,-0.56, respectively P<0.05).Conclusions HRV parameters are stable indexes that reflect the function of the cardiac autonomic nervous system. The results may be referred to in the study of newborns' HRV.