Show Daily D ily Health o- o 0 Serce Service o 0 oBy o oBy By DR MORRIS FISHBEIN Editor Journal of the American Medical Association and of Hygeia the Health Magazine 1 If I a muscle is is' taken from the body y yand and arid stimulated once every ry second Its contractions contractions' will wl become slower and slower and weaker and weaker In Ina a few few- minutes it wi will be b unable to contract at all If these contractions are traced and recorded one above the other the curve cue of contractions at first Is tall talland talland and narrow As the As-the the muscle muscle becomes becomes tired the contractions get weaker and slower until finally the muscle simply aim sim si- si ply will wU not move at all a. a The Te first fist effect of ot the fatigue fatge Is Isa Isa 1 a slowing of the contraction rather than a weakening weaken Those Tho who have haver run r long races know that near nea the te end of the race the legs do not seem to be weak but they simply will w not move as fast as we want them to move If I the blood blo supply supply-is I Is cut ct of off from one set of leg muscles and ad permitted to go on in the other set set and if i the muscles muscles' muscle are arc ac then stimulated the muscles muscle without blood blo become beme fa fatigued fatigued fa- fa much more quickly than those that are ae receiving blood blo In fact the muscles without blood blo seem sem to be become become be- be b- b come paralyzed In a afew afew few minutes The experiment can be b tried tied in a simple way by comparing two kinds of ot exercise If I you chin yourself on ona ona ona a bar your muscles become unable to t I respond In hi a a few minutes mute in the chinning chinning chinning chin chin- ning exercise because beaus the bending and anti swelling presses pres on the blood blo vessels yes ves ve- ve sels ads and Interferes with the blo blood supply However if 1 the te limbs libs are moving freely Creely and the blood circulates easily easi through though them violent exercise such as a zInging swinging Indian India clubs using wing the weights or gymnastics may my be b Indulged in indulged in- in In for tor a long time te The Important factor factor In in this ts connection connection con con- The muscles have necton is oxygen In themselves enough food fo material to tk take care of that used up by work It I has been suggested that the flow now of blood blo carries carrie away poisons poin that are ae developed by the muscles In in- their work work No doubt poisons are carried away But the crucial experiment may be b made of ot letting two muscles work one with wih oxygen and one with out The one without oxygen wears out in a a few minutes minute The one with oxygen goes on working for a long longtime time te When both bot are completely fa fatigued fatigued fa- fa they are allowed to rest ret After the rest ret the one that tat had hd oxygen re recovers recovers ye- ye covers and works again The muscle that had no o oxygen gen falls fails to recover It does dos not contract again As A explained by Dr A. A V. V Hill Nobel prize winner in medicine and Foulerton professor of at the Royal society a good go runner of of the sprint distances going at full lull speed spee would need ned more than 30 31 quarts of oxygen per minute if 1 he were required to t continue the speed of or the yard lO dash for a long iong time It has been found found found-by by b measurement that a mans man's mas ma's heart hea and lungs lung can supply him hl with about seventh one-seventh of that amount so that he cannot go goon goon goon on at such sch a high speed for more than a fraction of a minute He gets tired tied and acquires what the physiologists physiologists call cal an a oxygen debt debt The Te tiredness s Is I due to the appearance appearance of ofa ofa ofa a substance called ced lactic acid in the muscle mule fibers libers br As A much as one ounce of lactic acid appears when a aman man runs ru 10 yards 4 as a fast fat as a he can Fatge Fatigue of a occurs mainly due to the mU of the lactic laie acid The purpose of th Lb t oxygen is to remove the lactic lacic acid |