Maximal contraction methods influence the magnitude and reliability of global electromyographic signal characteristics
The purpose was two-fold: (1) to examine differences in maximal voluntary isometric torque (MVIT) production, and electromyographic signal amplitude (EMGAMP) and mean power frequency (EMGMPF) values obtained during traditional (MVICTRAD), rapid (MVICRAPID), and ramp (MVICRAMP) maximal voluntary isom...
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| Published in | Journal of electromyography and kinesiology Vol. 48; pp. 121 - 127 |
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| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
England
Elsevier Ltd
01.10.2019
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| Abstract | The purpose was two-fold: (1) to examine differences in maximal voluntary isometric torque (MVIT) production, and electromyographic signal amplitude (EMGAMP) and mean power frequency (EMGMPF) values obtained during traditional (MVICTRAD), rapid (MVICRAPID), and ramp (MVICRAMP) maximal voluntary isometric contractions, and (2) to determine if there were differences in the reliability of MVIT, EMGAMP and EMGMPF among the three MVIC types.
Twenty-two young males and females completed MVICTRAD, MVICRAPID, and MVICRAMP muscle actions on two separate visits separated by 48 h. During all MVICs, MVIT and EMGAMP and EMGMPF of the vastus lateralis (VL) and rectus femoris (RF) were quantified.
MVIT was greater during MVICTRAD and MVICRAPID than during MVITRAMP (both p < 0.001). VL and RF EMGAMP were greater during MVICRAMP than during MVICRAPID (p = 0.02 and 0.004). For EMGMPF, there were no significant differences among MVIC types. Although all MVIC types generally resulted in reliable measurements of MVIT and EMGAMP, reliability was stronger for EMGMPF quantified during the MVICRAMP.
Investigators may choose MVIC type based on preference or equipment availability. However, investigators should note that MVICRAMP contractions will likely yield the greatest EMGAMP values and more reliable measurements of VL and RF EMGMPF. |
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| AbstractList | OBJECTIVEThe purpose was two-fold: (1) to examine differences in maximal voluntary isometric torque (MVIT) production, and electromyographic signal amplitude (EMGAMP) and mean power frequency (EMGMPF) values obtained during traditional (MVICTRAD), rapid (MVICRAPID), and ramp (MVICRAMP) maximal voluntary isometric contractions, and (2) to determine if there were differences in the reliability of MVIT, EMGAMP and EMGMPF among the three MVIC types. APPROACHTwenty-two young males and females completed MVICTRAD, MVICRAPID, and MVICRAMP muscle actions on two separate visits separated by 48 h. During all MVICs, MVIT and EMGAMP and EMGMPF of the vastus lateralis (VL) and rectus femoris (RF) were quantified. MAIN RESULTSMVIT was greater during MVICTRAD and MVICRAPID than during MVITRAMP (both p < 0.001). VL and RF EMGAMP were greater during MVICRAMP than during MVICRAPID (p = 0.02 and 0.004). For EMGMPF, there were no significant differences among MVIC types. Although all MVIC types generally resulted in reliable measurements of MVIT and EMGAMP, reliability was stronger for EMGMPF quantified during the MVICRAMP. SIGNIFICANCEInvestigators may choose MVIC type based on preference or equipment availability. However, investigators should note that MVICRAMP contractions will likely yield the greatest EMGAMP values and more reliable measurements of VL and RF EMGMPF. The purpose was two-fold: (1) to examine differences in maximal voluntary isometric torque (MVIT) production, and electromyographic signal amplitude (EMGAMP) and mean power frequency (EMGMPF) values obtained during traditional (MVICTRAD), rapid (MVICRAPID), and ramp (MVICRAMP) maximal voluntary isometric contractions, and (2) to determine if there were differences in the reliability of MVIT, EMGAMP and EMGMPF among the three MVIC types. Twenty-two young males and females completed MVICTRAD, MVICRAPID, and MVICRAMP muscle actions on two separate visits separated by 48 h. During all MVICs, MVIT and EMGAMP and EMGMPF of the vastus lateralis (VL) and rectus femoris (RF) were quantified. MVIT was greater during MVICTRAD and MVICRAPID than during MVITRAMP (both p < 0.001). VL and RF EMGAMP were greater during MVICRAMP than during MVICRAPID (p = 0.02 and 0.004). For EMGMPF, there were no significant differences among MVIC types. Although all MVIC types generally resulted in reliable measurements of MVIT and EMGAMP, reliability was stronger for EMGMPF quantified during the MVICRAMP. Investigators may choose MVIC type based on preference or equipment availability. However, investigators should note that MVICRAMP contractions will likely yield the greatest EMGAMP values and more reliable measurements of VL and RF EMGMPF. The purpose was two-fold: (1) to examine differences in maximal voluntary isometric torque (MVIT) production, and electromyographic signal amplitude (EMG ) and mean power frequency (EMG ) values obtained during traditional (MVIC ), rapid (MVIC ), and ramp (MVIC ) maximal voluntary isometric contractions, and (2) to determine if there were differences in the reliability of MVIT, EMG and EMG among the three MVIC types. Twenty-two young males and females completed MVIC , MVIC , and MVIC muscle actions on two separate visits separated by 48 h. During all MVICs, MVIT and EMG and EMG of the vastus lateralis (VL) and rectus femoris (RF) were quantified. MVIT was greater during MVIC and MVIC than during MVIT (both p < 0.001). VL and RF EMG were greater during MVIC than during MVIC (p = 0.02 and 0.004). For EMG , there were no significant differences among MVIC types. Although all MVIC types generally resulted in reliable measurements of MVIT and EMG , reliability was stronger for EMG quantified during the MVIC . Investigators may choose MVIC type based on preference or equipment availability. However, investigators should note that MVIC contractions will likely yield the greatest EMG values and more reliable measurements of VL and RF EMG . |
| Author | Jenkins, Nathaniel D.M. Banks, Nile F. Tomko, Patrick M. Muddle, Tyler W.D. Colquhoun, Ryan J. Magrini, Mitchel A. |
| Author_xml | – sequence: 1 givenname: Patrick M. surname: Tomko fullname: Tomko, Patrick M. – sequence: 2 givenname: Ryan J. surname: Colquhoun fullname: Colquhoun, Ryan J. – sequence: 3 givenname: Nile F. surname: Banks fullname: Banks, Nile F. – sequence: 4 givenname: Mitchel A. surname: Magrini fullname: Magrini, Mitchel A. – sequence: 5 givenname: Tyler W.D. surname: Muddle fullname: Muddle, Tyler W.D. – sequence: 6 givenname: Nathaniel D.M. surname: Jenkins fullname: Jenkins, Nathaniel D.M. email: nathaniel.jenkins@okstate.edu |
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| Keywords | Knee extensors Neuromuscular Intra-class correlation coefficient Time-domain Frequency-domain |
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| SubjectTerms | Frequency-domain Intra-class correlation coefficient Knee extensors Neuromuscular Time-domain |
| Title | Maximal contraction methods influence the magnitude and reliability of global electromyographic signal characteristics |
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