多一小時的清醒 hw t add 0ne hur a day t yur wakg life (第2/6頁)
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ueaccumulatewithastonishingraidity。TheUnitedStatesArmyhasdiscoveredbyreeatedteststhatevenyoungmen—mentoughenedbyyearsofArmytraining—canmarchbetter，andholdulonger，iftheythrowdowntheiracksandresttenminutesoutofeveryhour。SotheArmyforcesthemtodojustthat。
YourheartisjustassmartastheU。S。Army。Yourheartumsenoughbloodthroughyourbodyeverydaytofillarailwaytankcar。Itexertsenoughenergyeverytwenty-fourhourstoshoveltwentytonsofcoalontoalatformthreefeethigh。Itdoesthisincredibleamountofworkforfifty，seventy，ormaybeninetyyears。Howcanitstandit?Dr。WalterB。Cannon，oftheHarvardMedicalSchool，exlainsit。Hesays:“Mosteolehavetheideathattheheartisworkingallthetime。Asamatteroffact，thereisadefiniteresteriodaftereachcontraction。Whenbeatingatamoderaterateofseventyulseserminute，theheartisactuallyworkingonlyninehoursoutofthetwenty-four。Intheaggregateitsresteriodstotalafullfifteenhourserday。”
Ahysicalworkercandomoreworkifhetakesmoretimeoutforrest。FrederickTaylordemonstratedthatwhileworkingasascientificmanage
