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ID:36327635
大小:304.00 KB
页数:24页
时间:2019-05-09
《ultraviolettherapy-floridainternationaluniversity:紫外线疗法-佛罗里达国际大学》由会员上传分享,免费在线阅读,更多相关内容在教育资源-天天文库。
1、UltravioletTherapyJenniferL.Doherty-Restrepo,MS,ATC,LATEntry-LevelMasterAthleticTrainingEducationProgramPET4995:TherapeuticModalitiesUltravioletRadiation(UVR)Electromagneticspectrum(2000to4000Å)Dividedintothreeranges:UV-A=NearUV(3200to4000Å)Littleornop
2、hysiologiceffectUV-B=MiddleUV(2900to3200Å)Sunburnandage-relatedskinchangesUV-C=FarUV(2000to2900Å)BactericidalUltravioletRadiationMostlikelytobeusedUV-BorUV-CUVRdepthofpenetrationis1to2mmPhysiologiceffectsaresuperficialUsedtotreatvariousskindisordersEff
3、ectonCellsUVRcauseschemicalexcitationofcellsResultsinalterationofcellbiochemistryandcellularmetabolismAffectssynthesisofDNAandRNAProteinandenzymeproductionisaltered,whichmayresultincelldeathEffectsonSkinEpidermisKeratinocytes,whichprovidefibrousprotect
4、iveproteinofskinDermisPapillarylayer-richbloodsupplyReticularlayer-heavyconnectivetissuecontainingfibroblasts,histocytes,andmastcellsEffectsonSkin:ErythemaGeneralizedresponsetoUVRexposureReddeningofskinAcuteinflammatoryreactionEndresults:Erythema-sunbu
5、rnPigmentation-tanningIncreasedepidermalthicknessEffectsonSkin:PhotosensitizationProcessinwhichapersonbecomesoverlysensitivetoUVRAcuteeffectsofUVRexposuremaybeexacerbatedifcertainchemicalsormedicationsarepresentonskin(orinbody)EffectsonSkin:TanningIncr
6、easeofpigmentationProtectivemechanismactivatedbyUVRexposureIncreaseofmelaninPigmentresponsiblefordarkeningskinMelaninfunctionsasabiologicfilterofUVRByscatteringradiationByabsorbingUVRBydissipatingabsorbedenergyasheatEffectsonSkin:TanningArtificialTanni
7、ng-manufacturersclaimtanningbedsproduceonlyUV-AProductionofUV-AislargelyunregulatedEffectsoflong-termexposuretoUV-AareunknownEffectsonSkin:Long-termPrematureagingoftheskinDryness,cracking,anddecreasedelasticityLinkedtoUVR-inducedDNAdamageSkincancerMost
8、commonmalignanttumorfoundinhumansBasalcellcarcinoma(rarelymetastasizes)Squamouscellcarcinoma(metastasizesin5%)Malignantmelanoma(usuallymetastasizes)DamagetoDNAsuspectedascauseRateofcureexceeds95%withearlydetectionEffectsonEyesUVRexposur
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