Yokota M, Ishibe Y, Yamauchi K, Tanimura H, Watanabe Y
Jpn Heart J. 1977 Jan;18(1):1-16. doi: 10.1536/ihj.18.1.
Noise-free and enlarged P loops of the Frank lead system were obtained from 164 normal Japanese males and 137 females (mean age: 34.4 and 33.2 years, respectively) with computer-averaging technique of 8 consecutive beats. Automated measurements concerning 17 parameters of the P loop (P durations, magnitudes, and directions of 3 planar, spatial maximal, and mean polar P vector) were carried out. At the same time, sex and age differences were statistically analyzed. I. Sex differences: Significant sex differences were found in 5 items in the first age group (20-29 years), 3 items in the second (30-39 years), and 7 items in the third (40-49 years). II. Age differences: In males, the effect of aging was observed in 5 parameters out of 17, in time durations extended and maximal vectors displaced posteriorly. In females, changes with advancing age were observed in 13 items out of 17, thus leaving only 4-parameter, including frontal maximal P vectors and directions of mean polar P vectors as unaffected.
采用连续8次心搏的计算机平均技术，从164名正常日本男性和137名女性（平均年龄分别为34.4岁和33.2岁）中获得了Frank导联系统无噪声且放大的P环。对P环的17个参数（P波持续时间、幅度以及3个平面、空间最大和平均极向P向量的方向）进行了自动测量。同时，对性别和年龄差异进行了统计分析。一、性别差异：在第一年龄组（20 - 29岁）的5项指标、第二年龄组（30 - 39岁）的3项指标以及第三年龄组（40 - 49岁）的7项指标中发现了显著的性别差异。二、年龄差异：在男性中，17个参数中有5个参数观察到了衰老的影响，表现为时间持续时间延长和最大向量向后移位。在女性中，17项中有13项观察到了随年龄增长的变化，因此只有4个参数未受影响，包括额面最大P向量和平均极向P向量的方向。
