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. 2002 Apr 1;540(Pt 1):261–269. doi: 10.1113/jphysiol.2001.013364

Figure 2. LDF response to a 12 mC monopolar anodal current application.

Figure 2

Typical recording of cutaneous laser Doppler flowmetry (LDF) response during and following a 12 mC monopolar anodal current application delivered all at once or in segmented periods of application and during the 24 min of local heating. From top to bottom, recordings are: Laser 1, LDF in arbitrary unit (AU) for a single 2 min current application; Laser 2, LDF for a twice-repeated 1 min current application; Arterial pressure; Skin temperature, local skin temperature 5 cm from the heated areas; Control laser, LDF on an unstimulated probe. Whereas vasodilatation in response to a 2 min current application is of limited amplitude, two 1 min periods result in an increased response following the second application rather than the first once the current has been stopped. This leads to higher LDF values than those achieved at sites where the current was applied in a single application.