Zamysłowska-Szmytke E
Zakładu Szkodliwości Fizycznych, Instytutu Medycyny Pracy, Lodzi.
Med Pr. 1995;46(1):47-54.
The main aim of present study was to estimate the repeatability of measurements of electric current thresholds performed ten times in the same person. The study covered five persons. Variation in values was connected with individual differences in perception of the stimuli. Coefficients of variation were used as a relative measure of dispersion. Coefficients of variation calculated for individual frequencies were as follows: 7-37% for direct current, 4-19% for alternating current at frequency of 50 Hz, 3-23% for 100 Hz, 5-26% for 400 Hz, 5-23% for 1000 Hz and 4-19% for transient current. Current at frequency of 50 Hz showed the lowest perception threshold and the highest repeatability of values. At frequencies 100, 400 and 1000 Hz values of perception thresholds were higher and more variable. Transient current was sensed at high intensity but it showed small differences in consecutive examinations.
本研究的主要目的是评估在同一人身上进行十次电流阈值测量的可重复性。该研究涵盖了五个人。数值的变化与个体对刺激的感知差异有关。变异系数被用作离散度的相对度量。针对各个频率计算的变异系数如下：直流电为7 - 37%，50赫兹交流电为4 - 19%，100赫兹为3 - 23%，400赫兹为5 - 26%，1000赫兹为5 - 23%，瞬态电流为4 - 19%。50赫兹频率的电流显示出最低的感知阈值和最高的数值可重复性。在100、400和1000赫兹频率下，感知阈值较高且更具变异性。瞬态电流在高强度下被感知到，但在连续检查中显示出较小差异。
