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Journal
2012 | 13 | 2 | 102-108
Article title

Maximal Isokinetic Peak Torque and EMG Activity Determined by Shorter Ranges of Motion

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EN
Abstracts
EN
Purpose. Isokinetic tests are often applied to assess muscular strength and EMG activity, however the specific ranges of motion used in testing (fully flexed or extended positions) might be constrictive and/or be painful for patients with injuries or under-going rehabilitation. The aim of this study was to examine the effects of different ranges of motion (RoM) when determining maximal EMG during isokinetic knee flexion and extension with different types of contractions and velocities. Methods. Eighteen males had EMG activity recorded on the vastus lateralis, vastus medialis, semitendinosus and biceps femoris muscles during five maximal isokinetic concentric and eccentric contractions for the knee flexors and extensors at 60° · s-1 and 180° · s-1. The root mean square of EMG was calculated at three different ranges of motion: (1) a full range of motion (90°-20° [0° = full knee extension]); (2) a range of motion of 20° (between 60°-80° and 40°-60° for knee extension and flexion, respectively) and (3) at a 10° interval around the angle where peak torque is produced. EMG measurements were statistically analyzed (ANOVA) to test for the range of motion, contraction velocity and contraction speed effects. Coefficients of variation and Pearson's correlation coefficients were also calculated among the ranges of motion. Results. Predominantly similar (p > 0.05) and well-correlated EMG results (r > 0.7, p ≤ 0.001) were found among the ranges of motion. However, a lower coefficient of variation was found for the full range of motion, while the 10° interval around peak torque at 180° · s-1 had the highest coefficient, regardless of the type of contraction. Conclusions. Shorter ranges of motion at around the peak torque angle provides a reliable indicator when recording EMG activity during maximal isokinetic parameters. It may provide a safer alternative when testing patients with injuries or undergoing rehabilitation.
Publisher

Journal
Year
Volume
13
Issue
2
Pages
102-108
Physical description
Dates
published
1 - 6 - 2012
online
28 - 6 - 2012
Contributors
  • Department of Health Science and Technology, Aalborg University, Aalborg, Denmark
  • Human Performance Laboratory, São Paulo State University, Rio Claro, Brazil
References
  • Kellis E., The effects of fatigue on the resultant joint moment, agonist and antagonist electromyography activity at different angles during dynamic knee extension efforts. J Electromyogr Kinesiol, 1999, 9 (3), 191-199, doi: 10.1016/S1050-6411(98)00032-7.[PubMed][Crossref]
  • Oliveira A. S., Corvino R. B., Gonçalves M., Caputo F., Denadai B. S., Effects of a single habituation session on neuromuscular isokinetic profile at different movement velocities. Eur J Appl Physiol, 2010, 110 (6), 1127-1133, doi: 10.1007/s00421-010-1599-z.[WoS][PubMed][Crossref]
  • Marginson V., Eston R., The relationship between torque and joint angle during knee extension in boys and men. J Sports Sci, 2001, 19 (11), 875-880, doi: 10.1080/02640 4101753113822.[Crossref]
  • Pincivero D. M., Salfetnikov Y., Campy R. M., Coelho A. L., Angle- and gender-specific quadriceps femoris muscle recruitment and knee extensor torque. J Biomech, 2004, 37 (11), 1689-1697, doi: 10.1016/j.jbiomech.2004.02.005.[PubMed][Crossref]
  • Reichard L. B., Croisier J. L., Malnati M., Katz-Leurer M., Dvir Z., Testing knee extension and flexion strength at different ranges of motion: an isokinetic and electromyographic study. Eur J Appl Physiol, 2005, 95, 371-376, doi: 10.1007/s00421-005-0006-7.[Crossref]
  • Croisier J. L., Malnati M., Reichard L. B., Peretz C., Dvir Z., Quadriceps and hamstrings isokinetic strength and electromyographic activity measured at different ranges of motion: A reproducibility study. J Electromyogr Kinesiol, 2007, 17 (4), 484-492, doi: 10.1016/j.jelekin.2006.04.003.[Crossref]
  • Croce R. V., Miller J. P., Angle- and velocity-specific alterations in torque and sEMG activity of the quadriceps and hamstrings during isokinetic extension-flexion movements. Electromyogr Clin Neurophysiol, 2006, 46 (2), 83-100.[PubMed]
  • Barak Y., Ayalon M., Dvir Z., Spectral EMG changes in vastus medialis muscle following short range of motion isokinetic training. J Electromyogr Kinesiol, 2006, 16 (5), 403-412, doi: 10.1016/j.jelekin.2005.09.006.[Crossref][PubMed]
  • Michaut A., Babault N., Pousson M., Specific effects of eccentric training on muscular fatigability. Int J Sports Med, 2004, 25 (4), 278-283, doi: 10.1055/s-2004-819940.[Crossref][PubMed]
  • Oliveira Ade S., Caputo F., Gonçalves M., Denadai B. S., Heavy-intensity aerobic exercise affects the isokinetic torque and functional but not conventional hamstrings: quadriceps ratios. J Electromyogr Kinesiol, 2009, 19 (6), 1079-1084, doi: 10.1016/j.jelekin.2008.10.005.[Crossref][WoS]
  • Hermens H. J., Feriks B., Merletti R., European recommendations for surface electromyography. The Netherlands: Roessingh Research and Development; 1999.
  • Duchateau J., Enoka R. M., Neural control of shortening and lengthening contractions: influence of tasks constraints. J Physiol, 2008, 586, 5853-5864, doi: 10.1113/jphysiol.2008.160747.[Crossref]
  • Grabiner M. D., Owings T. M., EMG differences between concentric and ecccentric maximum voluntary contractions are evident prior the movement onset. Exp Brain Res, 2002, 145 (4), 505-511, doi: 10.1007/s00221-002-1129-2.[Crossref]
  • Kellis E., Baltzopoulos V., Agonist and antagonist moment and EMG-angle relationship during isokinetic eccentric and concentric exercise. Isok Exerc Sci, 1996, 6 (2), 79-87.
  • Ricard M. D., Ugrinowitsch C., Parcell A. C., Hilton S., Rubley M. D., Sawyer R., Poole C. R., Effects of rate of force development on EMG amplitude and frequency. Int J Sports Med, 2005, 26 (1), 66-70, doi: 10.1055/s-2004-817856.[PubMed][Crossref]
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_v10038-012-0010-9
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