ISSN:
1741-0444
Schlagwort(e):
Alternating magnetic field
;
Biological effect
;
Eddy current
;
Laser Doppler flowmeter
;
Sensory receptors
;
Skin blood flow
;
Vasomotor tone
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Biologie
,
Chemie und Pharmazie
,
Medizin
Notizen:
Abstract The influence of alternating magnetic fields on human skin blood flow was investigated. The hands of volunteers were fixed just above an induction heater and the regional skin blood flow of a fingertip was measured by a laser Doppler flowmeter. The hands were exposed to fields with flux densities of 16 mT, 32 mT and 48 mT at a frequency of 3·8 kHz. Two parameters of the laser Doppler blood flow recording were studied: the dynamic and DC components. The dynamic component did not show any particular changes following magnetic stimulation. The DC component showed a rapid decrease in blood flow in the first period after field-on at 48 mT and 32 mT. A pain sensation with muscle contraction was recognised (48 mT and 32 mT). The effect of electrical stimulation on skin blood flow was also investigated. The differences between the magnetic and electrical effects are discussed. The results suggest that the human body responds to magnetic stimulation with an escape reaction which results in an elevated vasoconstrictor tone. The change in microvascular blood flow recorded with the laser Doppler method can probably be explained by the influence of the eddy currents on the sensory receptors of the skin.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF02441606
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