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| Titel: |
Mechanomyographic and electromyographic responses of the superficial muscles of the quadriceps femoris during maximal, concentric isokinetic muscle actions |
| Auteur: |
Joel T. Cramer Terry J. Housh Glen O. Johnson Kyle T. Ebersole Sharon R. Perry Anthony J. Bull |
| Verschenen in: |
Isokinetics and exercise science |
| Paginering: | Jaargang 8 (2001) nr. 2 pagina's 109-117 |
| Jaar: |
2001-04-01 |
| Inhoud: |
Eleven adult males (mean \pm SD age = 22 \pm 3 years) performed maximal, concentric isokinetic leg extension muscle actions at velocities of 60, 120, 180, 240, and 300^{\circ}\cdots^{-1} on a Cybex 6000 dynamometer. The results indicated that peak torque (PT) decreased (p<0.05) as muscle action velocity increased. Mechanomyographic (MMG) amplitude increased with velocity to 180^{\circ}\cdots^{-1} for each muscle tested (vastus lateralis = VL, rectus femoris = RF, and vastus medialis = VM). For the VL, MMG amplitude continued to increase to 240^{\circ}\cdots^{-1} and then plateaued, while the RF plateaued from 180 to 300^{\circ}\cdots^{-1}. The VM showed a constant increase in MMG amplitude to 300^{\circ}\cdots^{-1}. Electromyographic (EMG) amplitude increased to 180^{\circ}\cdots^{-1} and then plateaued for each muscle. These findings indicated muscle-specific differences in MMG amplitude patterns across velocity that may be attributable to differences in fiber type composition, muscle architecture, and/or tissue layer composition. Furthermore, these results suggested that there were muscle-specific, velocity-related differences in the association between motor unit activation (EMG) and the mechanical aspects of muscular activity (MMG). |
| Uitgever: |
IOS Press |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 4 van 7 gevonden artikelen
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