Kozmann G, Lux R L, Green L S
Nora Eccles Harrison Cardiovascular Research and Training Institute, University of Utah, School of Medicine, Salt Lake City 84112.
Circulation. 1989 May;79(5):1077-83. doi: 10.1161/01.cir.79.5.1077.
Within-group variability of body surface potential maps was assessed on data from 685 carefully validated normal subjects (348 men and 337 women). Sources of within-group variability were evaluated by subgrouping maps by patient sex, age, height, and weight. Contribution of reproducibility error to total variance was assessed in a separate group of 52 normal subjects in whom multiple maps were recorded. Total variance was significantly lower in women than in men. Total variance tended to decrease with age, and the greatest decrease occurred in men during the 3rd decade. The ratio of total variance to mean signal energy showed a slow decrease with age for each group. Results suggest that the dominant source of within-group variability arises from variability of cardiac electric sources while the influence of volume conductor variability is significantly less. Variability due to measurement reproducibility was approximately half of the total variance.
对685名经过仔细验证的正常受试者（348名男性和337名女性）的数据评估了体表电位图的组内变异性。通过按患者性别、年龄、身高和体重对地图进行分组来评估组内变异性的来源。在另一组记录了多张地图的52名正常受试者中评估了重复性误差对总方差的贡献。女性的总方差显著低于男性。总方差倾向于随年龄降低，最大降幅出现在男性的第三个十年。每组中总方差与平均信号能量的比值随年龄缓慢下降。结果表明，组内变异性的主要来源是心脏电源的变异性，而容积导体变异性的影响明显较小。由于测量重复性导致的变异性约为总方差的一半。
