AI Article Synopsis
- - The study explored how muscle activation and motor unit number estimation (MUNE) affect the rate of torque development (RTD) during rapid muscle contractions in younger (average age 22) and older men (average age 74).
- - Researchers recorded early phase RTD and muscle excitation using surface electromyography from the quadriceps, finding that muscle activation significantly influenced RTD, especially in older men.
- - The results indicated that older adults rely more on muscle activation at the start of contractions than younger adults, while MUNE did not significantly impact RTD for either age group.
Article Abstract
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) and normalized surface electromyography (first 50 ms of muscle excitation; nEMG) were recorded from the right quadricep muscle group. MUNE was examined from the right vastus lateralis. Multiple linear regression analyses revealed that nEMG had a significant effect on RTD independent of age group ( ≤ 0.001). nEMG had a significant effect on RTD in the OM group (p = 0.037). MUNE had no effect on RTD independent of age. Older adults may depend more on muscle activation at contraction onset of early phase RTD compared to younger adults.
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| http://dx.doi.org/10.1080/00222895.2021.2001412 | DOI Listing |
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