M. Cohen et al., ACUPUNCTURE NEEDLES AND THE SEEBECK EFFECT - DO TEMPERATURE-GRADIENTSPRODUCE ELECTROSTIMULATION, Acupuncture & electro-therapeutics research, 22(1), 1997, pp. 9-15
Acupuncture may act through modifying bioelectric events and this may
occur through different mechanisms including the application of extern
al currents. According to the Seebeck effect which produces a potentia
l difference when a temperature gradient is placed across a conductor,
the physical properties of acupuncture needles may produce internal c
urrents due to the temperature gradient across the needle when placed
insitu. Such currents were detected when needles were differentially h
eated and these currents were found to be in the range capable of prod
ucing biological effects. The traditional design of acupuncture needle
s and traditional needle manipulations seem to maintain a temperature
gradient across the needle and thus enhance the Seebeck effect.