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

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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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An examination of acute cross-over effects following unilateral low intensity concentric and eccentric exercise

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Sports Medicine and Health Science 2020年第3期2卷 141-152页

作者： William Miller sunggun jeon Xin Ye The University of Mississippi Department of HealthExercise Scienceand Recreation ManagementNeuromuscular LaboratoryUniversityMSUSA Oklahoma State University School of KinesiologyApplied Health and RecreationStillwaterOKUSA University of Hartford Department of Rehabilitation SciencesWest HartfordCTUSA

We compared the effects of low intensity concentric(CON)and eccentric(ECC)exercise on the force and neural responses of the dominant(exercised)elbow flexors(EFs),and studied if these conditions could induce cross-over effects to the contralateral(non-exercised)*** subjects(8 males)completed all conditions(CON and ECC:6 sets of low intensity exercise to failure;control:rest)in separate visits with a randomized *** isometric force and electromyography(EMG)of the dominant and contralateral EFs were assessed at pre,immediate-,24-,and ***-factor(condition and time)linear mixed-model analyses were performed to examine the force and EMG *** post CON,contralateral EFs force was significantly(p=0.026)higher(12.41%)than control,but no cross-over effects regarding the neural responses were *** post ECC,dominant EFs force was significantly lower in ECC,compared to CON(p=0.003)and control(p<0.001).This force remained depressed at 24-and 48-h post ECC,when compared to CON(p<0.001)and control(p<0.001).Our data suggests that submaximal unilateral exercises are not likely to impair contralateral muscle strength ***,concentric exercises may acutely improve muscle strength for the contralateral ***,this effect is not explained by changes in muscle excitation.

关键词： Contralateral Rate of force development Surface electromyography Muscle damage Submaximal

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The Minimum Number of Attempts for a Reliable Isometric Strength Test Score

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Journal of Science in Sport and Exercise 2020年第1期2卷 89-95页

作者： sunggun jeon William M.Miller Minsoo Kang Xin Ye Department of Health Exercise Scienceand Recreation ManagementThe University of MississippiUniversityMS 38677-1848USA

Purpose The maximal isometric strength test is widely used in general,athletic,and clinical ***,this test has often been used without considering how many trials are needed or appropriate to obtain reliable test ***,the aim of this study was to examine the maximal isometric strength test in upper and lower body for the purpose of determining the reliability of best isometric strength score and the ideal number of trials for a reliable test *** One hundred and twelve healthy adults were assigned to four different groups(elbow flexion with the vertical and horizontal forearm positions,knee flexion,and knee extension).After familiarization,all participants performed three maxi-mal isometric voluntary contractions with the designated muscle *** reliability of best isometric strength test score was calculated using the intraclass correlation coefficients(ICC)from a one-way ANOVA *** Spearman-Brown prophecy formula was used to identify the minimum number of trials *** The reliability of the best maximal isometric strength test scores out of three trials were high(ICC=0.92 to 0.98).At least two trials of maximal isometric strength test for knee flexion and one trial for elbow flexion and knee extension would be necessary to achieve an acceptable reliability coefficient of *** addition,one trial of elbow flexion would be enough for women,but men would need two *** Our results suggest that overall,at least two trials would be necessary to test isometric strength in upper and lower body muscles in both sexes.

关键词： Reliability Isometric strength Upper and lower body Sex difference

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Downhill running impairs peripheral but not central neuromuscular indices in elbow flexor muscles

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Sports Medicine and Health Science 2021年第2期3卷 101-109页

作者： Xin Ye Robert J.Benton William M.Miller sunggun jeon Jun Seob Song Department of Rehabilitation Sciences University of HartfordWest HartfordCTUSA Department of Health Exercise Scienceand Recreation ManagementUniversity of MississippiUniversityMSUSA School of Kinesiology Applied Health and RecreationOklahoma State UniversityStillwaterOKUSA

The purpose of this study was to examine the effects of a 1-h downhill running exercise on the elbow flexor muscles’neuromuscular *** adults(Control[CON]:n=9;Experimental[EXP]:n=8)completed this *** CON rested for 30 min while the EXP performed the downhill ***,10 min,24 h,and 48 h after the interventions,dependent variables(knee extensor muscle soreness,elbow flexion and knee extension isometric strength,elbow flexion resting twitch and voluntary activation[VA],and the biceps surface electromyography[EMG]amplitude)were *** extensor muscle soreness was significantly greater in the EXP than the CON group following the intervention throughout the entire 48 *** was accompanied by the greater decline in the knee extension strength in the EXP than the CON(mean±SD:-6.9±3.4%vs.1.0±3.2%,p=0.044).The elbow flexion strength,VA,and EMG amplitude were not affected by the ***,the decline of the elbow flexion resting twitch was greater in the EXP than the CON(±19.6±6.3%vs.8.7±5.9%,p=0.003).Therefore,the downhill running impaired the remote elbow flexor muscles at a peripheral level.

关键词： Muscle damage Twitch interpolation Voluntary activation Surface EMG Non-local effect

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Unilateral pleuroparenchymal fibroelastosis as a rare form of idiopathic interstitial pneumonia:A case report

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World Journal of Clinical Cases 2020年第18期8卷 4186-4192页

作者： Jae-Ha Lee Hang-Jea Jang Jin-Han Park Hyun-Kuk Kim sunggun Lee Ji-Yeon Kim Seong-Ho Kim Department of Internal Medicine Haeundae Paik HospitalInje University College of MedicineBusan 48108South Korea Department of Pathology Haeundae Paik HospitalInje University College of MedicineBusan 48108South Korea

BACKGROUND Pleuroparenchymal fibroelastosis(PPFE)is a rare idiopathic interstitial pneumonia characterized by predominantly upper lobe involvement with pleural fibrosis and subjacent parenchymal ***,there have been increasing reports of PPFE,and PPFE might coexist with other interstitial lung diseases in the lower lobe and upper ***,cases of unilateral PPFE are *** SUMMARY A 75-year-old Korean male presented to our hospital with chronic dry cough and exertional *** patient’s symptoms started 6 mo previously and had been gradually *** the time of presentation,he felt dyspnea when walking at his own *** findings suggested PPFE,but the lesion was localized in the upper lobe of the right *** multidisciplinary discussion,a transbronchial lung biopsy in the right upper lobe revealed collapsed alveoli with parenchymal fibroelastosis,and elastic van Gieson staining demonstrated septal elastosis with intra-alveolar collagenosis,which met the histopathologic criteria of definite *** multidisciplinary discussion in an experienced interstitial lung disease center,we confirmed the diagnosis of unilateral ***,we confirmed the progression of PPFE on radiologic findings during the followup *** Clinicians should consider PPFE,even in cases with unilateral,predominantly upper lung involvement in interstitial lung disease patients through multidisciplinary discussion.

关键词： Interstitial lung disease Pleuroparenchymal fibroelastosis Progression Unilateral Multidisciplinary discussion Case report

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