[Test of electric current perception thresholds at the fingertips--repeatability of the results].
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.
Zamysłowska-Szmytke
E
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Zakładu Szkodliwości Fizycznych, Instytutu Medycyny Pracy, Lodzi.
D000328:Adult; D004553:Electric Conductivity; D004558:Electric Stimulation; D004560:Electricity; D005260:Female; D005385:Fingers / Q000502:physiology*; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012684:Sensory Thresholds; D014110:Touch / Q000502:physiology*