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Gender Comparisons of Mechanomyographic Amplitude and Mean Power Frequency Versus Isometric Torque Relationships
Beck, Travis W. Housh, Terry J. Johnson, Glen O. Weir, Joseph P. Cramer, Joel T. Coburn, Jared W. Malek, Moh H.
Beck, Travis W.
Housh, Terry J.
Johnson, Glen O.
Weir, Joseph P.
Cramer, Joel T.
Coburn, Jared W.
Malek, Moh H.
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Abstract
This study compared the patterns of mechanomyographic (MMG) amplitude
and mean power frequency vs. torque relationships in men and women during
isometric muscle actions of the biceps brachii. Seven men (mean age 23.9 ±
3.5 yrs) and 8 women (mean 21.0 ± 1.3 yrs) performed submaximal to maximal
isometric muscle actions of the dominant forearm flexors. Following determination
of the isometric maximum voluntary contraction (MVC), they
randomly performed submaximal step muscle actions in 10% increments from
10% to 90% MVC. Polynomial regression analyses indicated that the MMG
amplitude vs. isometric torque relationship for the men was best fit with a
cubic model (R2 = 0.983), where MMG amplitude increased slightly from
10% to 20% MVC, increased rapidly from 20% to 80% MVC, and plateaued
from 80% to 100% MVC. For the women, MMG amplitude increased linearly
(r2 = 0.949) from 10% to 100% MVC. Linear models also provided the best fit
for the MMG mean power frequency vs. isometric torque relationship in both
the men (r2 = 0.813) and women (r2 = 0.578). The results demonstrated gender
differences in the MMG amplitude vs. isometric torque relationship, but
similar torque-related patterns for MMG mean power frequency. These findings
suggested that the plateau in MMG amplitude at high levels of isometric
torque production for the biceps brachii in the men, but not the women, may
have been due to greater isometric torque, muscle stiffness, and/or intramuscular
fluid pressure in the men, rather than to differences in motor
Description
This is the publisher's version, also found at http://ehis.ebscohost.com/ehost/detail?sid=e7a03093-e666-4634-b895-d6b4313857c2%40sessionmgr13&vid=1&hid=17&bdata=JnNpdGU9ZWhvc3QtbGl2ZQ%3d%3d#db=s3h&AN=15943883
Date
2005
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Publisher
Human Kinetics
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Keywords
Mechanomyography, Recruitment, Firing rate, Muscle function, Males and females
Citation
Beck, T.W.; Housh, T.J.; Johnson, G.O.; Weir, J.P.; Cramer, J.T.; Coburn, J.W.; and Malek, Moh H.