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Electromyographic, but not mechanomyographic amplitude-force relationships, distinguished differences in voluntary activation capabilities between individuals.
J Electromyogr Kinesiol. 2013 Apr; 23(2):356-61.JE

Abstract

The purpose of the present study was to examine the influence of activation capabilities on the electromyography (EMGRMS) and mechanomyography amplitude (MMGRMS)-force relationships of the vastus lateralis (VL) and rectus femoris (RF). Thirteen men (mean±SD; age=22±3 year) performed nine submaximal contractions (10-90% maximal voluntary contraction [MVC]) with the interpolated twitch technique performed during a separate contraction at 90% MVC to calculate percent voluntary activation (%VA). Nine participants with >90% VA were categorized into the high-activated group with the remaining categorized into the moderate-activated group. Slopes (b terms) were calculated from the log-transformed EMGRMS and MMGRMS-force relationships. The b terms (collapsed across the VL and RF) for the EMGRMS-force relationships were greater for the high- (1.29±0.31) than the moderate-activated (1.10±0.20) group. In contrast, there were no differences in the b terms for the MMGRMS-force relationships between the high- and moderate-activated groups. For the EMGRMS and MMGRMS-force relationships, the b terms were greater for the RF (1.38±0.30, 0.81±0.20) than the VL (1.08±0.19, 0.60±0.13) collapsed across groups. The b terms from the EMGRMS-force relationships, but not the MMGRMS-force relationships, reflected differences in %VA.

Authors+Show Affiliations

Neuromechanics Laboratory, Department of Health, Sport and Exercise Sciences, University of Kansas, Lawrence, KS 66045, USA. t.herda@ku.eduNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23318003

Citation

Herda, Trent J., and Michael A. Cooper. "Electromyographic, but Not Mechanomyographic Amplitude-force Relationships, Distinguished Differences in Voluntary Activation Capabilities Between Individuals." Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, vol. 23, no. 2, 2013, pp. 356-61.
Herda TJ, Cooper MA. Electromyographic, but not mechanomyographic amplitude-force relationships, distinguished differences in voluntary activation capabilities between individuals. J Electromyogr Kinesiol. 2013;23(2):356-61.
Herda, T. J., & Cooper, M. A. (2013). Electromyographic, but not mechanomyographic amplitude-force relationships, distinguished differences in voluntary activation capabilities between individuals. Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology, 23(2), 356-61. https://doi.org/10.1016/j.jelekin.2012.11.012
Herda TJ, Cooper MA. Electromyographic, but Not Mechanomyographic Amplitude-force Relationships, Distinguished Differences in Voluntary Activation Capabilities Between Individuals. J Electromyogr Kinesiol. 2013;23(2):356-61. PubMed PMID: 23318003.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Electromyographic, but not mechanomyographic amplitude-force relationships, distinguished differences in voluntary activation capabilities between individuals. AU - Herda,Trent J, AU - Cooper,Michael A, Y1 - 2013/01/12/ PY - 2012/09/25/received PY - 2012/11/20/revised PY - 2012/11/21/accepted PY - 2013/1/16/entrez PY - 2013/1/16/pubmed PY - 2013/8/31/medline SP - 356 EP - 61 JF - Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology JO - J Electromyogr Kinesiol VL - 23 IS - 2 N2 - The purpose of the present study was to examine the influence of activation capabilities on the electromyography (EMGRMS) and mechanomyography amplitude (MMGRMS)-force relationships of the vastus lateralis (VL) and rectus femoris (RF). Thirteen men (mean±SD; age=22±3 year) performed nine submaximal contractions (10-90% maximal voluntary contraction [MVC]) with the interpolated twitch technique performed during a separate contraction at 90% MVC to calculate percent voluntary activation (%VA). Nine participants with >90% VA were categorized into the high-activated group with the remaining categorized into the moderate-activated group. Slopes (b terms) were calculated from the log-transformed EMGRMS and MMGRMS-force relationships. The b terms (collapsed across the VL and RF) for the EMGRMS-force relationships were greater for the high- (1.29±0.31) than the moderate-activated (1.10±0.20) group. In contrast, there were no differences in the b terms for the MMGRMS-force relationships between the high- and moderate-activated groups. For the EMGRMS and MMGRMS-force relationships, the b terms were greater for the RF (1.38±0.30, 0.81±0.20) than the VL (1.08±0.19, 0.60±0.13) collapsed across groups. The b terms from the EMGRMS-force relationships, but not the MMGRMS-force relationships, reflected differences in %VA. SN - 1873-5711 UR - https://www.unboundmedicine.com/medline/citation/23318003/Electromyographic_but_not_mechanomyographic_amplitude_force_relationships_distinguished_differences_in_voluntary_activation_capabilities_between_individuals_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1050-6411(12)00215-5 DB - PRIME DP - Unbound Medicine ER -