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chronotropism

(krə-nŏtrə-pĭz′əm)
n.
  1. The modification of the rate of a periodic movement, such as the heartbeat, through some external influence.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.