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Were studied the effects of atropine and β-adrenoblockers on the power of very low (<0.25 Hz), low (0.25–0.70 Hz), and high frequency (0.7–1.8 Hz) waves of the heart rhythm in wakeful rats. Atropine reduced the power of all waves in 100% cases. Propranolol on average decreased the power of very low frequency waves and increased the power of low and high frequency waves, although opposite effects...
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