Gender comparisons of the mechanomyographic responses to maximal concentric and eccentric isokinetic muscle actions
| Autor: | Glen O. Johnson, S. R. Perry, T. K. Evetovich, Terry J. Housh, Douglas B. Smith, Kyle T. Ebersole |
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| Rok vydání: | 1998 |
| Předmět: |
Adult
Male medicine.medical_specialty Acceleration Muscle Fibers Skeletal Physical Therapy Sports Therapy and Rehabilitation Physical exercise Concentric Lower limb Sex Factors medicine Humans Eccentric Orthopedics and Sports Medicine Muscle Skeletal Analysis of Variance Leg business.industry Myography Signal Processing Computer-Assisted Body movement Biomechanical Phenomena Adipose Tissue Torque Calibration Body Composition Physical therapy Female Extensor muscle business Muscle Contraction |
| Zdroj: | Medicine & Science in Sports & Exercise. 30:1697-1702 |
| ISSN: | 0195-9131 |
| DOI: | 10.1097/00005768-199812000-00007 |
| Popis: | The purpose of this study was to determine whether there is a gender difference in the velocity-related patterns of mechanomyographic (MMG) responses to maximal isokinetic concentric (CON) and eccentric (ECC) muscle actions.Adult males (N = 15) and females (N = 16) performed maximal CON and ECC muscle actions of the leg extensors on a calibrated Cybex 6000 dynamometer at velocities of 30, 90, and 150 degrees.s-1. MMG was detected by a piezoelectric crystal contact sensor placed over the vastus lateralis muscle.The results indicated that there were decreases in CON peak torque (PT) across velocities, while ECC PT remained constant with increasing velocity for both genders. MMG amplitude increased significantly (P0.05) with velocity in both the males and females for CON and ECC muscle actions. There was a gender difference in the velocity-related patterns of MMG responses to maximal isokinetic CON muscle actions; however, there was no gender difference in the pattern of ECC MMG responses.The gender difference in CON MMG responses may be attributed to the greater percent decline in CON PT across velocity for the females than the males. In addition, the males displayed greater CON and ECC MMG amplitudes at all muscle action velocities than the females, possibly because of gender differences in muscle mass and/or thickness of the adipose tissue layer. |
| Databáze: | OpenAIRE |
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