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THE EFFECT OF STRENUOUS EXERCISE ON THE HEART AND KIDNEYS.

JAMA. 1906;XLVII(17):1380. doi:10.1001/jama.1906.02520170044005.
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The active campaign against football which was in progress last season, and which had as its result a modification of the rules, was set in motion by the deplorably great number of gross physical injuries incident to the game. The question as to what effects of a less tangible character violent exercise of this character produces is one which, though it has occasionally been considered, has hardly received the attention it deserves. It has been believed, in a general way, of course, that many well-known athletes die young, but scientific observations on the cardiovascular and renal changes in athletes, extending over years, are sadly lacking.

The question is brought up again by the recent observations of Baldes, Heichelheim and Metzger1 on the contestants in a twenty-mile walk. The facts which were brought out were not altogether new, though some data were added to the older ones of Leube, MacFarlane

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