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dc.contributor.authorWoods, Stacey
dc.contributor.authorMcKiel, Andrew
dc.contributor.authorHerda, Trent
dc.contributor.authorKlentrou, Panagiota
dc.contributor.authorHolmes, Michael
dc.contributor.authorGabriel, David
dc.contributor.authorFalk, Bareket
dc.date.accessioned2024-06-21T18:22:37Z
dc.date.available2024-06-21T18:22:37Z
dc.date.issued2024
dc.identifier.citationStacey Woods*, Andrew McKiel*, Trent Herda, Panagiota Klentrou, Michael Holmes, David Gabriel, Bareket Falk. Motor unit firing rates during slow and fast contractions in boys and men. Eur J Appl Physiol, Accepted May 3 2024. Online ahead of print May 19 2024en_US
dc.identifier.urihttp://hdl.handle.net/10464/18467
dc.description.abstractBackground Motor unit (MU) activation during maximal contractions is lower in children compared with adults. Among adults, discrete MU activation difers, depending on the rate of contraction. We investigated the efect of contraction rate on discrete MU activation in boys and men. Methods Following a habituation session, 14 boys and 20 men completed two experimental sessions for knee extension and wrist fexion, in random order. Maximal voluntary isometric torque (MVIC) was determined before completing trapezoidal isometric contractions (70%MVIC) at low (10%MVIC/s) and high (35%MVIC/s) contraction rates. Surface electromyography was captured from the vastus lateralis (VL) and fexor carpi radialis (FCR) and decomposed into individual MU action potential (MUAP) trains. Results In both groups and muscles, the initial MU fring rate (MUFR) was greater (p<0.05) at high compared with low contraction rates. The increase in initial MUFR at the fast contraction in the VL was greater in men than boys (p<0.05). Mean MUFR was signifcantly lower during fast contractions only in the FCR (p<0.05). In both groups and muscles, the rate of decay of MUFR with increasing MUAP amplitude was less steep (p<0.05) during fast compared with slow contractions. Conclusion In both groups and muscles, initial MUFRs, as well as MUFRs of large MUs were higher during fast compared with slow contractions. However, in the VL, the increase in initial MUFR was greater in men compared with boys. This suggests that in large muscles, men may rely more on increasing MUFR to generate torque at faster rates compared with boys.en_US
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.subjectMuscle activationen_US
dc.subjectChildrenen_US
dc.subjectEMG decompositionen_US
dc.subjectContraction Rateen_US
dc.titleMotor unit fring rates during slow and fast contractions in boys and menen_US
dc.typeArticleen_US
dc.identifier.doi10.1007/s00421-024-05500-8


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