Show book on sports reveals few causes of genuine fatigue the athlete who has wondered about the tired feelen feeling g that follows unusual exertion Is given the inside dope ape by professor elwyn of columbia university in lite hla new book yourself inc the runner or swi gimer simply tired he be has been poisoned and the villain in the case Is himself research has shown that exercise develops in the muscles a poison called lactic add acid which must be slowly burned up by oxygen to effect recovery in the few seconds ot of a y yard aid dash more than an ounce of acid Is for formed meil requiring over an hour before the last drop Is burned away the heat beat generated geneia ted in an active persons muscles consumes the oxygen find and releases the carbon dioxide experiments have shown that a swimmer exhales 12 times jimell is as much carbon dioxide as nn an idle person does A marching man with it a heavy pack develops sufficient heat every ft alvo ve minutes to raise the heat of tits his body one degree fahrenheit at the end of 10 hours however lie he does doe a not reach boiling point thanks to ills his wonderful automatic cooling system |