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Effect of repeated eccentric exercise on muscle damage markers and motor unit control strategies in arm and hand muscle

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Sports Medicine and Health Science 2022年第1期4卷 44-53页

作者： Sunggun Jeon Xin Ye William MMiller Jun Seob Song School of Kinesiology Applied Health and RecreationOklahoma State UniversityStillwaterOKUSA Department of Rehabilitation Sciences University of HartfordWest HartfordCTUSA Department of Health Exercise ScienceAnd Recreation ManagementUniversity of MississippiUniversityMSUSA

To examine the contralateral repeated bout effect(CL-RBE)on muscle damage markers and motor unit(MU)control strategies,seventeen healthy adults performed two bouts of 60 eccentric contractions with elbow flexor(EF group;n=9)or index finger abductor(IA group;n=8)muscles,separated by 1 *** participants randomly performed eccentric exercise on either the right or left arm or hand muscles,and muscle damage markers and submaximal trapezoid contraction tests were conducted pre,post,1-and 2-day post eccentric *** week after the first bout,the same exercise protocol and measurements were performed on the contralateral *** electromyographic(EMG)signals were collected from biceps brachii(BB)or first dorsal interosseous(FDI)during maximal and submaximal *** linear regression analyses were used to examine MU recruitment threshold versus mean firing rate and recruitment threshold versus derecruitment threshold *** amplitude from BB(bout 1 *** 2=65.71%±22.92%vs.43.05%±18.97%,p=0.015,d=1.077)and the y-intercept(group merged)from the MU recruitment threshold versus derecruitment threshold relationship(bout 1 *** 2=7.10±14.20 vs.0.73±16.24,p=0.029,d=0.513)at 50%MVIC were significantly different between two ***,other muscle damage markers did not show any CL-RBE in both muscle ***,despite changes in muscle excitation and MU firing behavior,our results do not support the existence of CL-RBE on BB and FDI muscles.

关键词： Muscle damage Repeated bout effect Cross-over effect motor unit behavior

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