The Influence of Motor Unit Number and Muscle Activation on Early Phase Rate of Torque Development in Younger and Older Men
| Autor: | Sydnie R. Fleming, Jacob A. Mota, Mitchel A. Magrini, Jason M. DeFreitas, Nick M Poidomani, Matt C Ferrell, Ryan J. Colquhoun, Nathaniel D.M. Jenkins, Jacob A. Siedlik |
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| Rok vydání: | 2021 |
| Předmět: |
Adult
Male medicine.medical_specialty Aging Cognitive Neuroscience Biophysics Experimental and Cognitive Psychology Isometric exercise Electromyography Young Adult Internal medicine Isometric Contraction medicine Humans Orthopedics and Sports Medicine Motor unit number estimation Muscle Strength Muscle Skeletal Aged medicine.diagnostic_test business.industry Motor unit number Muscle activation Torque Younger adults Cardiology Muscle group Early phase business |
| Zdroj: | Journal of motor behavior. 54(4) |
| ISSN: | 1940-1027 |
| Popis: | This study examined the influence of muscle activation and motor unit number estimation (MUNE) on early phase voluntary rate of torque development (RTD) in younger (YM) and older (OM) men. Thirty-two YM (n = 17; Age = 22 yrs) and OM (n = 15; Age = 74 yrs) volunteered to participate in this study. Early phase RTD (first 50 ms of a rapid isometric contraction; RTD50) and normalized surface electromyography (first 50 ms of muscle excitation; nEMG50) were recorded from the right quadricep muscle group. MUNE was examined from the right vastus lateralis. Multiple linear regression analyses revealed that nEMG50 had a significant effect on RTD50 independent of age group (p ≤ 0.001). nEMG50 had a significant effect on RTD50 in the OM group (p = 0.037). MUNE had no effect on RTD50 independent of age. Older adults may depend more on muscle activation at contraction onset of early phase RTD compared to younger adults. |
| Databáze: | OpenAIRE |
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