"International Journal of Physical Education, Sports and Health"
2017, Vol. 4, Issue 1, Part C
Electromechanical efficiency tracks eccentric torque productionAuthor(s):
Ethan C Hill, Terry J Housh, Clayton L Camic, Cory M Smith, Joshua L Keller, Richard J Schmidt and Glen O JohnsonAbstract:
It has been suggested that electromechanical efficiency may be useful for detecting changes in muscle function as it provides a direct measurement from the muscle being investigated. No previous investigations, however, have examined electromechanical efficiency during fatiguing eccentric exercise. Thus, the purpose of the present study was to examine electromechanical efficiency at velocities of 60°•s-1
during fatiguing, maximal eccentric muscle actions. Ten men performed 30 maximal eccentric muscle actions of the leg extensors at 60°•s-1
. Polynomial regression analyses were used to examine the composite patterns of responses for eccentric torque, electromyographic amplitude, mechanomyo graphic amplitude, and electromechanical efficiency across the fatiguing protocols. There were no significant relationships for torque or electromechanical efficiency across either of the fatiguing protocols. During the 60°•s-1
protocol, however, electromyographic amplitude decreased linearly (r = 0.579) and mechanomyo graphic amplitude decreased quadratically (R = 0.438), while there were no changes during the 180°•s-1
protocol. These findings indicated that electromechanical efficiency can be applied to fatiguing eccentric exercise and tracks eccentric torque production despite divergent electromyographic and mechanomyo graphic amplitude responses.Pages: 135-140 | 1123 Views 19 DownloadsDownload Full Article:
How to cite this article:
Ethan C Hill, Terry J Housh, Clayton L Camic, Cory M Smith, Joshua L Keller, Richard J Schmidt, Glen O Johnson. Electromechanical efficiency tracks eccentric torque production. Int J Phys Educ Sports Health 2017;4(1):135-140.