ultraviolettherapy-floridainternationaluniversity：紫外线疗法-佛罗里达国际大学

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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