title: The effect of leg extension training on the mean power frequency of the mechanomyographic signal.
abstract: The purpose of the present investigation was to examine the effect of concentric isokinetic leg extension training on the mean power frequency (MPF) of the mechanomyographic (MMG) signal. Twenty-one men were assigned into a training (TRN; n = 12) or control (CTL; n = 9) group. The TRN group performed six sets of leg extensions 3 days per week for 12 weeks at a velocity of 90 degrees /s. All subjects were tested every 4 weeks for peak torque (PT), while MMG was recorded from the vastus lateralis. PT increased, but there was no significant (P > 0.05) change in the MMG MPF over the 12-week training period. These results indicate that MMG MPF, measured from the vastus lateralis, was not sensitive to training-induced increases in leg-extension strength, possibly due to competing influences of hypertrophy on the MMG signal and/or training-induced adaptations in muscles other than the vastus lateralis.
authors.affiliation: Center for Youth Fitness and Sports Research, School of Health and Human Performance, University of Nebraska, Lincoln , USA. Tammy.Evetovich@usm.edu
authors.forename: T K
authors.initials: TK
authors.lastname: Evetovich
authors.forename: T J
authors.initials: TJ
authors.lastname: Housh
authors.forename: J P
authors.initials: JP
authors.lastname: Weir
authors.forename: D J
authors.initials: DJ
authors.lastname: Housh
authors.forename: G O
authors.initials: GO
authors.lastname: Johnson
authors.forename: K T
authors.initials: KT
authors.lastname: Ebersole
authors.forename: D B
authors.initials: DB
authors.lastname: Smith
mesh_terms: D004576:Electromyography / Q000379:methods*; D015444:Exercise / Q000502:physiology*; D005583:Fourier Analysis; D006801:Humans; D007866:Leg / Q000502:physiology; D008297:Male; D018482:Muscle, Skeletal / Q000502:physiology*; D011897:Random Allocation; D016059:Range of Motion, Articular; D019415:Torque