The effects of interelectrode distance over the innervation zone and normalization on the electromyographic amplitude and mean power frequency versus concentric,eccentric, and isometric torque relationships for the vastus lateralis muscle |
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| Authors: | Travis W Beck Terry J Housh Joel T Cramer Joseph P Weir |
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| Institution: | 1. Department of Nutrition and Health Sciences, Human Performance Laboratory, University of Nebraska-Lincoln, Lincoln, NE 68583, United States;2. Department of Health and Exercise Science, Biophysics Laboratory, University of Oklahoma, Norman, OK 73019, United States;3. Applied Physiology Laboratory, Division of Physical Therapy, Des Moines University Osteopathic Medical Center, Des Moines, IA 50312, United States;1. Universidade da Coruña, NEUROcom (Neuroscience and Motor Control Group) and Biomedical Institute of A Coruña (INIBIC), Department of Medicine-INEF Galicia, A Coruña, Spain;2. EMG Unit, Neurology Service, Hospital Clinic, Department of Medicine, University of Barcelona, August Pi i Sunyer Biomedical Research Institute (IDIBAPS), Barcelona, Spain;3. FENNSI Group, Hospital Nacional de Parapléjicos, SESCAM, Toledo, Spain;4. Centro de Estimulación Cerebral de Galicia, A Coruña, Spain;1. University of Nebraska – Lincoln, Lincoln, NE, United States;2. University of Kansas, Lawrence, KS, United States;3. Creighton University, Omaha, NE, United States;4. University of North Carolina – Chapel Hill, Chapel Hill, NC, United States;5. University of Wisconsin – La Crosse, La Crosse, WI, United States;6. University of Kentucky, Lexington, KY, United States;7. Oklahoma State University – Stillwater, Stillwater, OK, United States;1. Department of Sports Sciences, Islamic Azad University of Bojnourd, Iran;2. Center for Biomechanics and Motor Control (BMC), Department of Sports Sciences, University of Bojnord, Bojnord, Iran;3. Department of Sports Biomechanics, Sports Sciences Research Institute of Iran, Iran;4. Faculty of Sports Sciences, Hakim Sabzevari University, Iran;1. French National Institute of Sport (INSEP), Research Department, Laboratory Sport, Expertise and Performance, Paris, France;2. CETAPS UPRES EA 3832, Faculty of Sports Sciences, University of Rouen, Mont Saint Aignan Cedex, France;3. Neuromuscular Research Laboratory, Schulthess Clinic, Zurich, Switzerland;1. Department of Biomedical Sciences for Health, University of Milano, Italy;2. Department of Neurological, Biomedical and Movement Sciences, University of Verona, Italy |
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| Abstract: | The purpose of this study was to examine the influence of interelectrode distance (IED) over the estimated innervation zone (IZ) for the vastus lateralis muscle and normalization on the torque-related patterns of responses for electromyographic (EMG) amplitude and mean power frequency (MPF) during concentric isokinetic, eccentric isokinetic, and isometric muscle actions of the leg extensors. Eight men performed submaximal to maximal concentric isokinetic, eccentric isokinetic, and isometric muscle actions of the dominant leg extensors. Surface EMG signals were recorded simultaneously with two bipolar electrode arrangements in single differential configuration (20 and 40 mm IEDs) placed over the estimated IZ for the vastus lateralis muscle and a third electrode arrangement in single differential configuration (20 mm IED) placed distal to the estimated IZ. The results indicated that there were only a few (six of 90 statistical comparisons) significant (p < 0.05) mean differences among the three electrode arrangements for absolute EMG amplitude. There were no mean differences among the three electrode arrangements for absolute or normalized EMG MPF values or normalized EMG amplitude for the three types of muscle actions. Thus, it may be possible to reduce the potential influence of the IZ on amplitude and spectral parameters of the EMG signal through normalization. |
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