In this experiment

we have observed the effects of electroacupuncture on the contents of serum TSH

T4

T3

rT3

cortisol and testosterone

hypothalamic and pituitary β-EP

plasma cAMP

cGMP and the ratio of cAMP/cGMP. The results showed that the contents of serum T3 and T4 were obviously increased

while the plasma cAMP and cGMP decreased significantly by electroacupuncture at Zusanli acupoint. It suggested that electroacupuncture has a regulative action on the thyroid hormones

and cyclic nucleotides may be involved in the action.