Pulsed direct and constant direct currents in the pilocarpine iontophoresis sweat chloride test

BMC Pulmonary Medicine

Table 6 Frequency and current in relation to the skin temperature

Frequency (Hz)*	Current^#	Skin temperature	Mean	Standard deviation
0 (CDC)	0.5	Before	30.9	0.4
		After	29.3	1.2
	0.75	Before	31.0	0.3
		After	30.6	1.5
	1	Before	30.5	0.9
		After	30.4	0.7
	1.5	Before	31.0	0.3
		After	30.6	1.5
200	0.5	Before	30.9	1.2
		After	29.6	0.4
	0.75	Before	31.5	3.2
		After	29.6	1.4
	1	Before	31.6	2.3
		After	31.2	1.8
	1.5	Before	29.4	1.8
		After	28.0	1.4
1,000	0.5	Before	31.8	0.9
		After	30.7	0.1
	0.75	Before	31.3	0.8
		After	30.1	0.8
	1	Before	30.4	2.3
		After	31.3	1.0
	1.5	Before	30.8	1.0
		After	31.1	2.0
5,000	0.5	Before	31.4	1.6
		After	29.3	1.4
	0.75	Before	30.2	0.8
		After	29.9	0.7
	1	Before	31.6	2.1
		After	30.3	2.1
	1.5	Before	32.8	1.5
		After	31.4	0.5

CDC, constant direct current; Hz, Hertz, mA, milliampere. *In the analysis considering the frequency in relation to skin temperature, p-value = 0.4102; ^#In the analysis considering the current in relation to skin temperature, p-value = 0.5361; for interaction between current and frequency in relation to skin temperature, p-value = 0.0884. The skin temperature before the experiment was higher than after, p-value <0.0001.

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