Individual variation of heart rate variability in Japanese population.

在站立和仰卧两种体位条件下，对75名日本健康男性受试者（年龄范围：20-61岁）的心率变异性（HRV）频谱分量进行了重复测量（4-8次测量，平均值：6次测量）。分析低频（LF）和高频（HF）分量和平均心率（HR），并特别参考个体变化，将其分为个体间（interV）和个体内（intraV）两种类型。计算了v间和v内的贡献率百分比和变异系数。站立和仰卧位对HR的贡献分别为15.8%和12.9%。站立时HF和LF的v内率分别为31.5%和26.5%，而仰卧位时HF和LF的v内率分别为27.8%和35.5%。并计算了interV （interCV）和intraV （intraCV）的系数。站立时HR、HF、LF的intervs分别为14.9、41.4、48.4%，仰卧位时HR、HF、LF的intervs分别为16.2、42.9、44.2%。站立时HR、HF、LF的intracv分别为5.0、19.7%、21.2%，仰卧位时分别为4.7、20.1%、23.0%。我们还计算了对数变换后的HRV指数的interV和intrv。对数变换显著降低了这两个变量：interCV和intraCV分别为14- 16%和6-7%。虽然室间变异相当大，但HRV的室内变异可以忽略不计。HRV指数随年龄的增长而下降，但HR保持不变。决定系数（r^2）为14-34%。对于对数变换的HRV指数，确定系数为9-15%，表明观察到的间隔的14-34%（原始）或9-15%（对数）可能是由于年龄的变化。

Spectral components of heart rate variability (HRV) were repeatedly measured (4-8 measurements; mean: 6 measurements) in 75 healthy Japanese male subjects (age range:20-61) under two postural conditions (standing and supine). Low-frequency (LF) and high-frequency (HF) components and mean heart rate (HR) were analyzed with special reference to individual variations, which were classified into two types : inter-(interV) and intra-individual variations (intraV). The percent contributions and coefficients of variations were calculated for both interV and intraV. Percent contributions of intraV (intraV%) of HR with standing and supine postures were 15.8 and 12.9%, respectively. The intraV% of HF and LF on standing were 31.5 and 26.5%, while those in the supine posture were 27.8 and 35.5%, respectively. The coefficients of interV (interCV) and intraV (intraCV) were also calculated. The interCVs of HR,HF, and LF on standing were 14.9,41.4,nd 48.4%, while those in the supine posture registered 16.2,42.9,and 44.2%, respectively. The intraCVs of HR, HF, and LF on standing were 5.0, 19.7, and 21.2%, while those in the supine posture indicated 4.7, 20.1, and 23.0%, respectively. We also calculated the interV and intraV of logarithmic-transformed HRV indexes. The log-transformation remarkably diminished both variables: interCV and intraCV registered 14-16 and 6-7%, respectively. Although interV variations were considerabley large, intraV variations of HRV were negligibley small. The HRV indexes decreased with age, although HR remained unchanged. The coefficients of determination (r^2) were 14-34%. In the case of log-transformed HRV indexes, the coefficients of determination registered 9-15%, suggesting that 14-34% (raw) or 9-15% (log) of the observed interV may be due to variations in age.