EMG and MMG of agonist and antagonist muscles as a function of age and joint angle. |
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| Authors: | Anna Jaskólska Brzenczek-Owczarzak" target="_blank">Wioletta Katarzyna Kisiel-SajewiczBrzenczek-Owczarzak Guang H Yue Artur Jaskólski |
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| Institution: | 1. Department of Kinesiology, Faculty of Physiotherapy, University School of Physical Education, 51-629 Wroc?aw, ul. Rze?biarska 4, Poland;2. Department of Physiology, Faculty of Physical Education, 66-400 Gorzów Wlkp., Poland;3. Departments of Biomedical Engineering and Rehabilitation Medicine, Cleveland Clinic Foundation, Cleveland, OH, USA;1. Department of Biotechnological and Applied Clinical Sciences, University of L’Aquila, Italy;2. University eCampus, Novedrate, COMO, Italy;3. Tunisian Research Laboratory “Sport Performance Optimization” National Center of Medicine and Science in Sports (CNMSS), Tunis, Tunisia;4. Department of Biomechanics, Faculty of Physical Education and Sport Sciences, Semmelweis University, Budapest, Hungary;1. Department of Mechanical Engineering, Stanford University, United States;2. Department of Bioengineering, Stanford University, United States;1. Department of Clinical and Experimental Sciences, University of Brescia, Viale Europa, 11, 25123 Brescia, Italy;2. Laboratory of Neuromuscular Rehabilitation (LaRiN), University of Brescia – Institute “Casa di Cura Domus Salutis”, Institute “Domus Salutis”, Via Lazzaretto, 3, 25123 Brescia, Italy;3. Department of Rehabilitation, Institute“Domus Salutis”, Via Lazzaretto, 3, 25123 Brescia, Italy;4. Department of Neurobiology, University School of Physical Education, 27/39 Królowej Jadwigi St., 61-871 Poznan, Poland;1. Graduate program in Rehabilitation Science, University of British Columbia, Vancouver, Canada;2. Laboratorio di Ingegneria del Sistema Neuromuscolare (LISiN), Dipartimento di Elettronica e Telecomunicazioni, Politecnico di Torino, Italy;3. Escola de Educação Física e Desportos, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brasil;4. Department of Physical Therapy, University of British Columbia, Vancouver, Canada;1. Department of Mechanical, Energy, and Materials Engineering, University of Extremadura, Avda. de Elvas, s/n, 06006 Badajoz, Spain;2. Health Education Lab, Experimental Sciences Education Area, University of Extremadura, Avda. de Elvas, s/n, 06006 Badajoz, Spain |
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| Abstract: | The aim of this study was to determine the effect of elbow joint position on electromyographic (EMG) and mechanomyographic (MMG) activities of agonist and antagonist muscles in young and old women. Surface EMG and MMG were recorded from the triceps and biceps brachii, and brachioradialis muscles during isometric elbow extensions in young and old women. The measurements were carried out at an optimal joint angle (A(o)), as well as at smaller (A(s) = A(o) - 30 degrees ) and larger (A(l) = A(o) + 30 degrees ) angles. The normalized to force EMG amplitude (RMS-EMG/F) was smaller in old women compared to young in all muscles. The RMS-EMG/F of the triceps brachii muscle was not affected by muscle length while that of the biceps brachii and brachioradialis muscles increased at shortest muscle length in both groups. The normalized to force MMG amplitude (RMS-MMG/F) was smaller in old than in young in the triceps brachii muscle only. There was an increase in RMS-MMG/F with triceps brachii and biceps brachii muscle shortening in both groups, and in the brachioradialis muscle -- in young only. Compared to young, older women exhibited a bigger force fluctuation during maximum voluntary contraction, but these did not contribute significantly to the RMS-MMG. Skinfold thickness accounted for the RMS-EMG/F and RMS-MMG/F differences seen between old and young women in the biceps brachii muscle only. It is concluded that, the EMG and MMG response to muscles length change in agonist and antagonist muscles is generally similar in old and young women but the optimal angle shifts toward a bigger value in older women. |
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