Purpose The purpose of this study was to examine peak torque(PT),mean power(MP),electromyographic(EMG)amplitude,mechanomyographic(MMG)amplitude,and neuromuscular efficiency from EMG and MMG amplitude(NME_(EMG)and NME_...Purpose The purpose of this study was to examine peak torque(PT),mean power(MP),electromyographic(EMG)amplitude,mechanomyographic(MMG)amplitude,and neuromuscular efficiency from EMG and MMG amplitude(NME_(EMG)and NME_(MMG),respectively)across the velocity spectrum in children versus adolescents.Methods Seventeen children(n=8 males,n=9 females)and 22 adolescents(n=11 males,n=11 females)participated.Participants completed maximal concentric isokinetic leg extensions at 60,120,180,240 and 300°/s.PT,MP,EMG amplitude,and MMG amplitude were quantified during all muscle actions.NME_(EMG)and NME_(MMG)were quantified by expressing PT relative to EMG and MMG amplitude,respectively,for each muscle action.Results PT,MP,NME_(EMG),and NME_(MMG)were greater for the adolescents than the children collapsed across sex and veloc-ity(P≤0.021).There were no significant differences for EMG amplitude(P≥0.051),while MMG amplitude increased significantly from 60 to 240°/s(P<0.001)then decreased significantly from 240 to 300°/s(P<0.001)for all groups.Conclusion Overall,regardless of velocity,the expression of PT relative to EMG and MMG amplitude(NME_(EMG)and NME_(MMG),respectively),in conjunction with measurements of torque and power production,may provide practitioners a unique method of examining growth and development-related augmentations in neuromuscular function during dynamic movements.展开更多
基金the University of Nebraska Agriculture Research Division with funds provided by the Hatch Act(Agency:U.S.Department of Agriculture,National Institute of Food and Agriculture,Accession No:1000080,Project No:NEB-36-078)a grant from Abbott Nutrition,Columbus,OH.
文摘Purpose The purpose of this study was to examine peak torque(PT),mean power(MP),electromyographic(EMG)amplitude,mechanomyographic(MMG)amplitude,and neuromuscular efficiency from EMG and MMG amplitude(NME_(EMG)and NME_(MMG),respectively)across the velocity spectrum in children versus adolescents.Methods Seventeen children(n=8 males,n=9 females)and 22 adolescents(n=11 males,n=11 females)participated.Participants completed maximal concentric isokinetic leg extensions at 60,120,180,240 and 300°/s.PT,MP,EMG amplitude,and MMG amplitude were quantified during all muscle actions.NME_(EMG)and NME_(MMG)were quantified by expressing PT relative to EMG and MMG amplitude,respectively,for each muscle action.Results PT,MP,NME_(EMG),and NME_(MMG)were greater for the adolescents than the children collapsed across sex and veloc-ity(P≤0.021).There were no significant differences for EMG amplitude(P≥0.051),while MMG amplitude increased significantly from 60 to 240°/s(P<0.001)then decreased significantly from 240 to 300°/s(P<0.001)for all groups.Conclusion Overall,regardless of velocity,the expression of PT relative to EMG and MMG amplitude(NME_(EMG)and NME_(MMG),respectively),in conjunction with measurements of torque and power production,may provide practitioners a unique method of examining growth and development-related augmentations in neuromuscular function during dynamic movements.
