The effect of a physical load on the frequency of contraction of a heart deprived of spinal sensory innervation
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Long-term experiments were performed on dogs. A study was made of the effect produced by physical exercise on heart rate before and after extirpation of the spinal ganglia from the 5 upper thoracic segments. The vagi were blocked with atropine, and the sympathetic nerves with dihydroergotoxin. A decrease in heart rate occurred after the extirpation. The de-afferented heart showed a smaller increase in rate in response to physical exercise.
Removal of the dorsal root ganglia was followed by a disturbance of vagal tone and by a more marked disturbance of sympathetic tone.
KeywordsPublic Health Heart Rate Dorsal Root Ganglion Atropine Physical Exercise
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