Science.

Alexandra Herald and Central Otago Gazette, Issue 413, 14 April 1904, Page 3

Science.

■ip '• j EXEECISB, otijictiW. Urged piyjs) agaifiet exercises which canee a ■ maSt **e e perspiration, is |be danger of [ ] taking® <jmll. 5 Thwsiins K isk "of this so long as thfi.«exertaon goes on, and-when it is discontinued, if the surface Sof the body is well covered to protect it tfitom rapid* loßß*-bf heat; we" snail rarefy hear of physical exertion resulting in chill. » T< j( u |o ia'adoo* « Once more, thg action of the fbeart, as '-every one must nave observed, is directly by active exertion, There is $& focrease in both thefdifce'o'f th¥beW i aad;its freqaeaejjswithna -corresponding of its power. This ia perW y^ B< V l<m S a s< con* *tinue to be reguEr and equal. On the iOUhM'fcand, if we actiontfeboi^erarlEular

,Htjmdicates that the heart'esbtreagth is Jbfiag overtaxed aad..demaaas} thatn.the tfSSW' 3^^lfa|ii: ba s%sft#ttre/ Should be jmmediately disconiinusd prits iadobnt considerably reduoed/'i'fnow. tHis Us at all -times 1 Aft test the effects* jof l&urtexerKsepSaif enables us to decide,whether we ; are;ex. ; 'for health. The increased force and fre-" qaescy of the' thus naturally^iaccompaaiessieiertibn^' ; mil augment and qnickea the flow of blood, ;aha jthe oirculatujn will,be carried pa;, with largbr volume" and at'" mole ) rapid rate .Xhejaccelerated flow of blood carries Wore, of tbVfljamehttf bjf nulritibtt to thbvwious; •tissues for purposes of eustenahce' and repair, ajtd, jbhe eubstepce, p| ;thft! heart! itself must necessarily share, in this adt van&ge. It, follows thefe{6rft.tgaFw¥ile. cf»hys,ical %i«rtidn -balls-'"for 1 on ,aie part of (the rihearj tmUi directly a^

yet I&JSwJ the benefits*©! 5 physical •exertion* andsitl&t icufcfaamuableaofthp body generally. It £§-#|fn]geraaJJ# adiai*t|dJhaA our liwM#"eoome^irtfigei; t by% gonsj&anlftse/MfM pilgtifajlyfafffif*; J|at| exercise of the muscles 1 promotes th|ir: health! 3Ses| how 3 -Ti*e antrimest of/a, muscle is ; in fxaot of blood which through it, because its nourish ß muscles, are in a, state of aetMty'(as they mast be daring physical exertion} 1 more blood; is 'drawn, towards cheni than would Meet them in a state of repdse^ e ffle haye;Been<that the increased fbtfce! aa'd frequency of the h'earibbaat accelerates the flow of the blood; this is still | farther, angmented-by ahiadj of,, auction action oa the part of the muscular

structures themselves?- Thiirvßryißtivity f« lenders,them thirsty as it; were, <,n6t\ < Mot the sate of the fluid itself but tarn j s ]

account of th£ additional riutrimeht ; ,ther "* ygira Ahlodd* 5 ; katdraHy 'sdpply. i Hence the wear Bad tear- which' must E -is promptly met by an increase of t thei « ,nutr|tion and abundant material j for* muscles are exercised the more liberally s they fare nourished* JaHd*4he ! bettef-they * are-led the stronger they .become! I t £ slight sense of fatigue which ac- * Tsompanfes.j| l a_jearly,_ effort., deters-many- ~t persons from habitual exertion, They t say that so * [ that j they do not feel .strong enough for t the Work. This sense of fatigue is seldom ia u proportion ito tithe camounfesofi actual? I

%&rtionj it is more frequently the conprevious •iaaetivity. * By*re* sftrtejat exercise the feeling of eflort, with its accompanying sensation of fatigue, grows gradually less and less,, so thatjsrithin .the. limits &- greater,amount,, of > physical exertion can ,JSffortr ;wbich,fare„repeated; dailyjare peformpd' at leßs t aiid |o. the syptem,^'^fiat'b ! y^ : habilina ! l v ''e'zerti6n'' the-expenditure 4s 'considerably reduced; 4 so withwaMngf iitf a man of > sej3|ntary habit starta a, walk.- of sis or, eight? miles] it is'ahnndfed'td^one'that' he reaoh'his journey's end. Oh "the other hand, if he /began' (with a couple of -miles, and repeated the,; : walk; daily >sith; a gradual, ,pf distance, lie, would won find himself able to do the.. half-doiien miles with'lees fatigue than he' experienced afe^firstwith'thetwd. ;;i * '''' ! i; ;::;Thpse.persons .whose occupation provides ithem with an.;adequate; aniouat of \ allow matters but those 5 whose habits 'are of a t&sy Icharacterj'dr whbs^ ordinary' pibyment keeps them within doors, 1 will find demands made upon their "health they asfeiotaUy.unprepared to meet,. The normal' changes ia the tisßpes; of, their | bodies /will be incomplete, 1 wasfe' products will accumulate '•■'- in! and .produce: disturbances of so grave '-:»- kiad ;as to deprive them of both theien?'ibymeat and usefulness of life.