The effect of leg extension training on the mean power frequency of the mechanomyographic signal

✍ Scribed by Tammy K. Evetovich; Terry J. Housh; Joseph P. Weir; Dona J. Housh; Glen O. Johnson; Kyle T. Ebersole; Douglas B. Smith

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 108 KB
• Volume: 23
• Category: Article
• ISSN: 0148-639X
• DOI: 10.1002/(sici)1097-4598(200006)23:6<973::aid-mus21>3.0.co;2-c

✦ Synopsis

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°/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.