Age-related Sarcopenia and Muscular Fatigue: An Electromyographic and Mechanomyographic Study
| Autor: | Peng Chien-Hua, 彭千華 |
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| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 The purpose of this study was to investigate the effects of age-related sarcopenia on muscle mass, relative muscle strength/power peroformance in the lower limbs, and the responses of electromyography (EMG) and mechanomyography (MMG) on the activation patterns of motor units under leg extension muscle power performance in the elderly. Subjects were healthy old (n=10, 64.5 ± 4.5 yrs) and young (n=10, 22.6 ± 2.8yrs) groups. Subjects’ lean thigh volumes (LTV) were measured before task. All subjects performed quadriceps maximal voluntary contraction (MVC) and fastest speed leg extension with different levels (75%, 60%, 45% 1RM), and 45% fatigue test to all-out. LTV, Absolute/relative maximal MVC (MVCmax), maximal power of 75%1RM (Pmax), different level EMG/MMG amplitudes (root mean square, rmsEMG/rmsMMG) and frequencies (mean power frequency, mpfEMG/mpfMMG) responses of vastus lateralis concentric contraction, and median frequency (mdfEMG/mdfMMG) response to fatigue were compared between groups. Comparing to the young, the elderly had significantly less LTV, absolute/relative MVCmax and Pmax (p |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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