The Influence of Motor Unit Number and Muscle Activation on Early Phase Rate of Torque Development in Younger and Older Men.

Autor: Magrini MA; Creighton University, Omaha, NE, USA., Colquhoun RJ; University of South Alabama, Mobile, AL, USA., Ferrell MC; Oklahoma State University Center for Health Sciences, Tulsa, OK, USA., Fleming SR; University of South Alabama, Mobile, AL, USA., Mota JA; University of Alabama, Tuscaloosa, AL, USA., Siedlik JA; Creighton University, Omaha, NE, USA., Poidomani NM; Creighton University, Omaha, NE, USA., Jenkins NDM; University of Iowa, Iowa City, IA, USA., DeFreitas JM; Oklahoma State University, Stillwater, OK, USA.
Jazyk: angličtina
Zdroj: Journal of motor behavior [J Mot Behav] 2022; Vol. 54 (4), pp. 422-428. Date of Electronic Publication: 2021 Nov 11.
DOI: 10.1080/00222895.2021.2001412
Abstrakt: 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; RTD 50 ) and normalized surface electromyography (first 50 ms of muscle excitation; nEMG 50 ) were recorded from the right quadricep muscle group. MUNE was examined from the right vastus lateralis. Multiple linear regression analyses revealed that nEMG 50 had a significant effect on RTD 50 independent of age group ( p  ≤ 0.001). nEMG 50 had a significant effect on RTD 50 in the OM group (p = 0.037). MUNE had no effect on RTD 50 independent of age. Older adults may depend more on muscle activation at contraction onset of early phase RTD compared to younger adults.
Databáze: MEDLINE
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