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Show Book on Sports Reveals Few Causes of Genuine Fatigue The athlete who has wondered about the tired feeling that follows unusual exertion is given the "inside dope" by Professor Ehvyn of Columbia university univer-sity in his new book, "Yourself, Inc." The runner or swimmer isn't simply tired ; he has been poisoned and the villain in the case is himself. Research has shown that exercise develops In the muscles a poison called lactic acid, which must be slowly burned up by oxygen to effect recovery. recov-ery. In the few seconds of a 100-yard dash more than an ounce of acid is formed, requiring over an hour before the last drop is burned away. The heat generated in an active person's muscles consumes the oxygen and releases re-leases tlie carbon dioxide. Experiments have shown that a swimmer exhales 12 times as much carbon dioxide as an idle person does. A marching man with a heavy pack develops sutlicient heat every five minutes to raise the heat of his body one degree Fahrenheit; at the end of 10 hours, however, he does not reach boiling point, thanks to his wonderful automatic cooling system. |