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1、Unit2:SectionAIronandtheEffectsofExerciseIntensiveStudyIronandtheEffectsofExercise1Sportsmedicineexpertshaveobservedforyearsthatenduranceathletes,particularlyfemales,frequentlyhaveirondeficiencies.NowanewstudybyateamofPurdueUniversityresearcherssuggeststhatevenmoderate
2、exercisesmayleadtoreducedironinthebloodofwomen.2“Wefoundthatwomenwhowerenormallyinactiveandthenstartedaprogramofmoderateexerciseshowedevidenceofironloss,”saysRoseanneM.Lyle,associateprofessoratPurdue.Herstudyof62formerlyinactivewomenwhobeganexercisingthreetimesaweekfor
3、sixmonthswaspublishedinthejournalMedicine&ScienceinSports&Exercise.IntensiveStudy3“Womenwhoconsumedadditionalmeatortookironsupplementswereabletobounceback,”shenotes.“Butthenewexerciserswhofollowedtheirnormaldietshowedadecreaseinironlevels.”4Irondeficiencyisverycommonam
4、ongwomeningeneral,affectingoneinfourfemaleteenagersandoneinfivewomenaged18to45,respectively.Buttheratioisevengreateramongactivewomen,affectingupto80percentoffemaleenduranceathletes.Thismeans,Lylesays,that“toomanywomenignoretheamountofirontheytakein”.Womenofchild-bearin
5、gageareatgreatestrisk,sincetheirmonthlybleedingisamajorsourceofironloss.Plus,manyhealth-consciouswomenincreasetheirriskbyrejectingredmeat,whichcontainsthemosteasilyabsorbedformofiron.Andbecausewomenoftenrestricttheirdietinanefforttocontrolweight,theymaynotconsumeenough
6、iron-richfood,andareliabletoexperienceadeficiency.IntensiveStudy5“Theaveragewomantakesinonlytwothirdsoftherecommendeddailyallowanceforiron,”notesanotherexpert.“Forawomanwhoalreadyhasapoorironstatus,anyadditionalironlossfromexercisemaybeenoughtotipherovertheedgeintoamor
7、eseriousdeficiency,”notestheexpert.6Exercisescanresultinironlossthroughavarietyofmechanisms.Someironislostinsweat,and,forunknownreasons,intenseenduranceexerciseissometimesassociatedwithbleedingofthedigestivesystem.Athletesinhigh-impactsportssuchasrunningmayalsoloseiron
8、throughaphenomenonwheresmallbloodvesselsinthefeetleakblood.IntensiveStudy7Therearethreestagesofirondeficiency.Thefirs
