Higher muscle fiber conduction velocity and early rate of torque development in chronically strength trained individuals

Journal of Applied Physiology
A Del VecchioF Felici

Abstract

Strength trained individuals (ST) develop greater levels of force when compared to untrained subjects. These differences are partly of neural origin and can be explained by training induced changes in the neural drive to the muscles. In the present study we hypothesize a greater rate of torque development (RTD) and faster recruitment of motor units with greater muscle fiber conduction velocity (MFCV) in ST when compared to a control cohort. MFCV was assessed during maximal voluntary isometric explosive contractions of the elbow flexors in eight ST and eight control individuals. MFCV was estimated from high-density surface electromyogram recordings (128 electrodes) in intervals of 50 ms starting from the onset of the EMG. The rate of torque development (RTD) and MFCV were computed and normalized to their maximal voluntary torque (MVT) values. The explosive torque of the ST was greater than in the control group in all time intervals analyzed (p<0.001). The absolute MFCV values were also greater for the ST than controls at all time intervals (p<0.001). ST also achieved greater normalized RTD in the first 50 ms of contraction (887.6 {plus minus} 152 vs. 568.5 {plus minus} 148.66 %MVT∙s-1, p<0.001) and normalized MFCV befor...Continue Reading

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Citations

Sep 7, 2018·Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme·Mathew I B Debenham, Geoffrey A Power
Nov 7, 2019·Medicine and Science in Sports and Exercise·Andrea CasoloAlessandro Del Vecchio
Mar 19, 2020·Journal of Clinical Medicine·Riccardo BorzuolaAndrea Macaluso
Aug 5, 2020·Scandinavian Journal of Medicine & Science in Sports·Lucas B R OrssattoFernando Diefenthaeler
Jul 14, 2020·Exercise and Sport Sciences Reviews·Per AagaardJesper Lundbye-Jensen
Oct 28, 2019·Frontiers in Human Neuroscience·Alexander Kurz, Christian Leukel
Sep 22, 2020·The Journal of Sports Medicine and Physical Fitness·Jordan NolanGregory E Peoples
Oct 17, 2019·Journal of Neurophysiology·Jakob L DideriksenDario Farina
Jan 4, 2022·Scandinavian Journal of Medicine & Science in Sports·Thomas G BalshawJonathan P Folland

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Software Mentioned

MFCV MAX
MFCV
SPSS
LabVIEW
OT
MATLAB

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