与血压一样,人体心率的24h分布特征也受自主神经的影响,临床已开始应用心率昼夜规律的变化评估自主神经功能。[定义]人体全天心率的分布存在明显的昼夜规律性:勺型和非勺型等多种形式。正常时,人体夜间的平均心率比同天白天平均心率值下降10%～20%,而晨醒后心率增快。当夜间平均心率比白天下降≥10%时,这种心率分布称为正常的勺型心率(图1A),而下 As with blood pressure, the distribution of human heart rate 24h also affected by autonomic nervous system, the clinical application of heart rate has begun to evaluate changes in autonomic nervous function. [Definition] The distribution of human heart rate throughout the day there is a clear day and night regularity: spoon-shaped and non-spoon-shaped and other forms. Normal, the average nighttime human heart rate than the same daytime average heart rate decreased by 10% to 20%, and heart rate after morning wake up faster. This heart rate profile is referred to as normal spoon-type heart rate (Fig. 1A) when the average nighttime heart rate drops more than 10% during the day, whereas lower