E. ERNST; A. MATRAI
To the editor: Allow us to comment on the recent article by Stewart and colleagues (1). The authors found intestinal bleeding in runners (taking into account the uncertainties of the method used) and linked this finding to the runner's lower hematocrits.
We have tested 14 semiprofessional male soccer players and found their average hematocrit to be 7% lower than that of age-and sex-matched controls. In another series, we have found that patients' individual hematocrits correlate with their work capacity on ergometer testing. In both studies we also have shown lower plasma viscosity in trained persons; this variable also correlates with
ERNST E, MATRAI A. Hematocrit and Plasma Volume in Runners. Ann Intern Med. ;101:571. doi: 10.7326/0003-4819-101-4-571_1
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Published: Ann Intern Med. 1984;101(4):571.
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