Influences of Interelectrode Distance and Innervation Zone on Electromyographic Signals

Abstract

The purpose of the present study was to examine the effects of electrode placements centered over and offset from the innervation zone (IZ) with different interelectrode distances (IED) on the time and frequency domain parameters of the electromyographic (EMG) signal during a fatiguing submaximal, isometric workout. 11 adults performed an isometric leg extension muscle action at 50% maximal voluntary isometric contraction (MVIC) to exhaustion. Electromyographic amplitude and frequency parameters were determined from electrode placements with different IED centered over, at proximal offset, at distal offset, and away from the IZ at 10, 50, and 100% of the time to exhaustion using an electrode array. There were greater absolute EMG amplitude and lower absolute EMG frequency for electrode placements over and offset from the IZ, but lower absolute EMG amplitude over than offset from the IZ regardless of IED at each time-point during the time to exhaustion. The absolute EMG frequency values were affected by the location relative to the IZ and IED of the electrode placements, and were greater for distal offset vs. proximal offset electrode placements at each time-point. Normalization of the EMG amplitude and EMG frequency values to MVIC eliminated differences due to IED and electrode placements during the fatiguing workout.

Key word

EMG - fatigue - IZ - normalize - IED

• References

• 1 Abe T, Kumagai K, Brechue WF. Fascicle length of leg muscles is greater in sprinters than distance runners. Med Sci Sports Exerc 2000; 32: 1125-1129
• 2 Bailey A, Baum G, Radzik H, Woods A. Implications of Muscle Activation Patterns on Balance in the Elderly. Capstone Project. City University of New York; 2015
• 3 Basmajian JV, De Luca C. Muscles alive: their functions revealed by electromyography. Baltimore: Williams & Wilkins; 1985. 278. 126
• 4 Beck TW, Housh TJ, Cramer JT, Malek MH, Mielke M, Hendrix R. The effects of the innervation zone and interelectrode distance on the patterns of responses for electromyographic amplitude and mean power frequency versus isometric torque for the vastus lateralis muscle. Electromyogr Clin Neurophysiol 2008; 48: 13-25
• 5 Beck TW, Housh TJ, Cramer JT, Mielke M, Hendrix R. The influence of electrode shift over the innervation zone and normalization on the electromyographic amplitude and mean power frequency versus isometric torque relationships for the vastus medialis muscle. J Neurosci Method 2008; 169: 100-108
• 6 Beck TW, Housh TJ, Cramer JT, Weir JP. 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. J Electromyogr Kinesiol 2009; 19: 219-231
• 7 Beck TW, Housh TJ, Johnson GO, Weir JP, Cramer JT, Coburn JW, Malek MH. The effects of interelectrode distance on electromyographic amplitude and mean power frequency during isokinetic and isometric muscle actions of the biceps brachii. J Electromyogr Kinesiol 2005; 15: 482-495
• 8 Beck TW, Housh TJ, Johnson GO, Weir JP, Cramer JT, Coburn JW, Malek MH. The effects of interelectrode distance on electromyographic amplitude and mean power frequency during isokinetic and isometric muscle actions of the biceps brachii. J Electromyogr Kinesiol 2005; 15: 482-495
• 9 Cesarelli M, d’Angelo G, Romano M, Bifulco P, Clemente F. A new system to deliver vibration, measure motion and EMG reaction for forearm muscles. 20th IMEKO TC-4 International Symposium 2014; 608-611
• 10 Farahmand F, Sejiavongse W, Amis AA. Quantitative study of the quadriceps muscles and trochlear groove geometry related to instability of the patellofemoral joint. J Orthop Res 1998; 16: 136-143
• 11 Farina D, Cescon C, Merletti R. Influence of anatomical, physical, and detection-system parameters on surface EMG. Biol Cybern 2002; 86: 445-456
• 12 Farina D, Colombo R, Merletti R, Olsen HB. Evaluation of intra-muscular EMG signal decomposition algorithms. J Electromyogr Kinesiol 2001; 11: 175-187
• 13 Farina D, Gazzoni M, Merletti R. Assessment of low back muscle fatigue by surface EMG signal analysis: methodological aspects. J Electromyogr Kinesiol 2003; 13: 319-332
• 14 Farina D, Merletti R, Enoka RM. The extraction of neural strategies from the surface EMG. J Appl Physiol 2004; 96: 1486-1495
• 15 Farina D, Merletti R, Enoka RM. The extraction of neural strategies from the surface EMG: an update. J Appl Physiol 2014; 117: 1215-1230
• 16 Fortune E, Lowery MM. The effect of extracellular potassium concentration on muscle fiber conduction velocity examined using model simulation. Annual International Conference of the IEEE Engineering in Medicine and Biology Society 2007; 2726-2729
• 17 Haddas R, Sawyer SF, Sizer PS, Brooks T, Chyu M-C, James CR. Effects of volitional spine stabilization and lower extremity fatigue on trunk control during landing in a recurrent low back pain population. J Orthop Sports Phys Ther 2016; 46: 71-78
• 18 Harriss D, Atkinson G. Ethical standards in sport and exercise science research: 2016 update. Intern J Sport Med 2015; 36: 1121-1124
• 19 Hermens HJ, Freriks B, Disselhorst-Klug C, Rau G. Development of recommendations for SEMG sensors and sensor placement procedures. J Electromyogr Kinesiol 2000; 10: 361-374
• 20 Kulig K, Andrews JG, Hay JG. Human strength curves. Exerc Sport Sci Rev 1984; 12: 417-466
• 21 Li W, Sakamoto K. The influence of location of electrode on muscle fiber conduction velocity and EMG power spectrum during voluntary isometric contraction measured with surface array electrodes. Appl Human Sci 1996; 15: 25-32
• 22 Lynn P, Bettles N, Hughes A, Johnson S. Influence of electrode geometry on bipolar recordings of the surface electromyogram. Med Biol Engin Comp 1978; 16: 651-660
• 23 EMG16 User Manual.16-channels surface electromyographic signal amplifier. Italy: LISiN Bioengineering Center Polytechnic of Turin, Department of Electronics Turin; 2006
• 24 Merletti R, Farina D, Gazzoni M. The linear electrode array: a useful tool with many applications. J Electromyogr Kinesiol 2003; 13: 37-47
• 25 Mesin L, Reddy Kandoor AK, Merletti R. Separation of propagating and non propagating components in surface EMG. Biomed Signal Proc Cont 2008; 3: 126-137
• 26 Rainoldi A, Melchiorri G, Caruso I. A method for positioning electrodes during surface EMG recordings in lower limb muscles. J Neurosci Method 2004; 134: 37-43
• 27 Rainoldi A, Nazzaro M, Merletti R, Farina D, Caruso I, Gaudenti S. Geometrical factors in surface EMG of the vastus medialis and lateralis muscles. J Electromyogr Kinesiol 2000; 10: 327-336
• 28 Rutkove SB. Effects of temperature on neuromuscular electrophysiology. Muscle Nerve 2001; 24: 867-882
• 29 Sinsurin K, Pluemjai S, Srisangboriboon S, Suanshan S, Vachalathiti R. Gluteus medius muscle activities during standing hip abduction exercises in the transverse plane at different angles. J Med Assoc Thai 2015; 98: 42-47
• 30 Smith C, Housh T, Herda T, Zuniga J, Camic C, Bergstrom H, Smith D, Weir J, Cramer J, Hill E. Electromyographic responses from the vastus medialis during isometric muscle actions. Int J Sports Med 2016; 37: 647-652
• 31 Smith CM. Time course of changes in neuromuscular parameters during fatiguing high-load and low-load concentric dynamic constant external resistance leg extension muscle actions (MS Thesis, University of Nebraska-Lincoln). 2016
• 32 Smith CM, Housh TJ, Herda TJ, Zuniga JM, Ryan ED, Camic CL, Bergstrom HC, Smith DB, Weir JP, Cramer JT, Hill EC, Cochrane KC, Jenkins ND, Schmidt RJ, Johnson GO. Effects of the innervation zone on the time and frequency domain parameters of the surface electromyographic signal. J Electromyogr Kinesiol 2015; 25: 565-570
• 33 Yao W, Fuglevand RJ, Enoka RM. Motor-unit synchronization increases EMG amplitude and decreases force steadiness of simulated contractions. J Neurophysiol 2000; 83: 441-452