Biofeedback is one of branches of studying internal viscerology in modernpsychophysiology.Patients with sinus tachycardia and sinus bradycardia of unknownetiology had obvious symptoms,usually responding unfavorably to drugs.Thisresearch twenty nine patients with sinus tachycardia and 21 with sinus bradycardiawere treated applying noise and light heart rhythm biofeedback.There were 15 timesin one course of treatment,once everyday.Each treatment took 30 minutes.Theresult showed:the heart rate was decreased by...