字典翻译 问答 小学 英语 Sportsmedicineexpertshaveobservedforyearsthatathletessuchaslongdistancerunnersespeciallywomenathletesoftendisplayalackofiron.NowanewstudybyateamofPurdueUniversityresearcherssuggeststhatevenmoderateexer
问题标题:
Sportsmedicineexpertshaveobservedforyearsthatathletessuchaslongdistancerunnersespeciallywomenathletesoftendisplayalackofiron.NowanewstudybyateamofPurdueUniversityresearcherssuggeststhatevenmoderateexer
问题描述:

Sportsmedicineexpertshaveobservedfor yearsthatathletessuchaslongdistancerunnersespeciallywomenathletesoftendisplayalackofiron.NowanewstudybyateamofPurdueUniversityresearcherssuggeststhatevenmoderateexercisemayleadtoreducedironinthebloodofwomen.

"Wefoundthatwomenwhowerenormallyinactiveandthenstartedaprogramofmoderateexerciseofmiddledegreeshowedsingsofironloss"saysRoseanneM.LyleassociateprofessoratPurdue.Herstudyof62formerlyinactivewomenwhobeganexercisingthreetimesaweekforsixmonthswaspublishedinthejournalMedicine&ScienceinSports&Exercise.

Irondeficiencyisverycommonamongwomeningeneralaffectingoneinfourfemaleteenagersandoneinfivewomenaged18to45respectively.Buttheratioisevengreateramongactivewomenaffectingupto80percentoffemaleenduranceathletes.ThismeansLylesaysthat"toomanywomenignoretheamountofirontheytakein".Womenofchild-bearingageareatgreatestrisksincetheirmonthlybleedingisamajorsourceofironloss.Plusmanyhealth-consciouswomenincreasetheirriskbyrejectingredmeatwhichcontainsthemosteasilyabsorbedformofiron.Andbecausewomenoftenrestricttheirdietinanefforttocontrolweighttheymaynotconsumeenoughiron-richfoodandareliabletoexperienceadeficiency.

Exercisecanresultinironlossthroughavarietyofmechanisms.Someironislostinsweatandforunknownreasonsintenseenduranceexerciseissometimesassociatedwithbleedingofthedigestivesystem.Athletesinhigh-impactsportssuchasrunningmayalsoloseironthroughaphenomenonwheresmallbloodvesselsinthefeetleakblood.

Therearethreestagesofirondeficiency.Thefirstandmostcommonishavinglowironreservesaconditionthattypicallyhasnosymptoms.Fatigueandpoorperformancemaybegintoappearinthesecondstageofdeficiencywhennotenoughironispresenttoformthemolecules(分子)ofbloodproteinthattransportoxygentotheworkingmuscles.Inthethirdandfinalstagepeopleoftenfeelweaktiredandoutofbreath-andexerciseperformanceisseverelycompromised.

"Peoplethinkthatifthey'renotatthethirdstagenothingiswrongbutthat'snottrue"

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