athlete's heart
or athletic heart
- nonpathological enlargement of the heart resulting from intensive aerobic exercise.
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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
athletic heart
(ăth-lĕt′ĭk)- Enlargement of the heart observed in some athletes.
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The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.