Show book on sports reveals few causes of fatigue the athlone who lias has wondered about the tired feeling that follows unusual exertion Is given the inside dope by professor eivan of columbia ur university ilver ta la tits new book yourself inc the runner or swimmer simply tired he lias 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 he be slowly burned up by oxygen to effect recovery in the few seconds of a yard dash more than an ounce of acid is formed requiring over an hour before tho the last drop Is burned away the heat beat generated la in an active persons muscles inu siles consumes the oxygen and releases leases the carbon dioxide experiments have shown howo that a eIm swimmer mer exhales 12 times as much carbon dioxide as an idle person does A marching man with a heavy pack pach develops sufficient clent heat every five minutes to raise the heat beat of his body one degree fahrenheit at the end of 10 hours however lie he does not reach boiling point thanks to his wonderful automatic cooling cool leg system |