简介：<正>Background:Muscularstrengthcanbeconceptuallydeterminedbytwocomponents:muscleactivationandsize.Muscleactivationbythecentralnervoussystemcanbemeasuredbysurfaceelectromyography(sEMG).Muscularsizereflectstheamountofcontractileproteinwithinaskeletalmuscleandcanbeestimatedbyanthropometricmeasurements.Thepurposeofthisstudywastodeterminetherelativecontributionsofsizeparametersandmuscleactivationtothepredictionofmaximalvoluntaryisometricelbowflexionstrength.Methods:Aseriesofanthropometricmeasurementsweretakenfrom96participants.Torqueandroot-mean-square(RMS)ofthesEMGfromthebicepsbrachiiwereaveragedacrossthreemaximalvoluntaryisometriccontractions.AmultiplelinearregressionanalysiswasperformedbasedonaPearson’scorrelationmatrix.Results:Bodyweight(BW)accountedfor39.1%and27.3%inmalesandfemales,respectively,andwasthestrongestpredictorofstrengthformales.Forearmlength(L3)wasthestrongestpredictorofstrengthinfemales(partialR~2=0.391).Elbowcircumference(ELB)accountedforasignificant(p<0.05)amountofvarianceinmalesbutnotfemales.TheadditionofsEMGRMSasathirdvariableaccountedforanaverageof10.1%ofthevarianceexcludingtheequationofBWandL3infemales.ThestrongestpredictionequationincludedBW,L3,andELBaccountingfor55.6%and58.5%ofthevarianceinmalesandfemales,respectively.Conclusion:Anthropometricsprovideastrongpredictionequationfortheestimationofisometricelbowflexionstrength.Muscleactivation,asmeasuredbysEMGactivity,accountedforasignificant(p<0.05)amountofvarianceinmostpredictionequations,however,itscontributionwascomparabletoanadditionalanthropometricvariable.

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