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Chronic training status affects muscle excitation of the vastus lateralis during repeated contractions

运动医学与健康科学(英文) 2023年第1期5卷 42-49页

作者： Sunggun Jeon Stephanie A.Sontag Trent J.Herda Michael A.Trevino Applied Neuromuscular Physiology Laboratory Department of KinesiologyApplied Healthand RecreationOklahoma State UniversityStillwaterOKUSA Neuromechanics Laboratory Department of HealthSportand Exercise SciencesThe University of KansasLawrenceKSUSA

This study examined electromyographic amplitude(EMGRMS)-force relationships during repeated submaximal knee extensor muscle actions among chronic aerobically-(AT),resistance-trained(RT),and sedentary(SED)*** adults(5/group)attempted 20 isometric trapezoidal muscle actions at 50%of maximal *** electromyography(EMG)was recorded from vastus lateralis(VL)during the muscle *** the first and last successfully completed contractions,linear regression models were fit to the log-transformed EMGRMS-force relationships during the linearly increasing and decreasing segments,and the b terms(slope)and a terms(antilog of y-intercept)were *** was averaged during steady *** the AT completed all 20 muscle *** the first contraction,the b terms for RT(1.3010.197)were greater than AT(0.9100.123;p?0.008)and SED(0.9120.162;p?0.008)during the linearly increasing segment,and in comparison to the linearly decreasing segment(1.0180.139;p?0.014),*** the last contraction,the b terms for RT were greater than AT during the linearly increasing(RT?1.3730.353;AT?0.8830.129;p?0.018)and decreasing(RT?1.5260.328;AT?0.9700.223;p?0.010)*** addition,the b terms for SED increased from the linearly increasing(0.9680.144)to decreasing segment(1.2680.126;p?0.015).There were no training,segment,or contraction differences for the a *** during steady force increased from the first-([64.0851.68]μV)to last-contraction([86.7349.55]μV;p?0.001)collapsed across training *** b terms differentiated the rate of change for EMGRMS with increments in force among training groups,indicating greater muscle excitation to the motoneuron pool was necessary for the RT than AT during the linearly increasing and decreasing segments of a repetitive task.

关键词： Electromyography Fatigue Isometric trapezoidal muscle action motor unit control properties Natural log-transformed model Vastus lateralis

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