Increased cardiac fibrosis after prolonged exercise. (A) Body length in 21-month-old fish raised in either normal (n=13) or running water (n=12). (B) Ventricle length in 21-month-old fish raised in either normal (n=12) or running water (n=11). (C) Increased myocardial fibrosis in zebrafish maintained in running water conditions. (D) Myocardial fibrosis scores in zebrafish maintained in running water conditions (n=12) or running water (n=11). Data are mean±s.e.m. *P<0.05; ns, not significant (unpaired two-tailed Student's t-test).
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