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Dependence of the Paired Motor Unit Analysis on Motor Unit Discharge Characteristics in the Human Tibialis Anterior Muscle by Jennifer L. Stephenson; Katrina S. Maluf is a Neuroscience article available to read on EtoBox.

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The paired motor unit analysis provides in vivo estimates of the magnitude of persistent inward currents (PIC) in human motoneurons by quantifying changes in the firing rate (ΔF) of an earlier recruited (reference) motor unit at the time of recruitment and derecruitment of a later recruited (test) motor unit. This study assessed the variability of ΔF estimates, and quantified the dependence of ΔF on the discharge characteristics of the motor units selected for analysis. ΔF was calculated for 158 pairs of motor units recorded from nine healthy individuals during repeated submaximal contractions of the tibialis anterior muscle. The mean (SD) ΔF was 3.7 (2.5)pps (range -4.2 to 8.9 pps). The median absolute difference in ΔF for the same motor unit pair across trials was 1.8 pps, and the minimal detectable change in ΔF required to exceed measurement error was 4.8 pps. ΔF was positively related to the amount of discharge rate modulation in the reference motor unit (r2 = 0.335; P<0.001), and inversely related to the rate of increase in discharge rate (r2 = 0.125; P<0.001). A quadratic function provided the best fit for relations between ΔF and the time between recruitment of the reference

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Author

Jennifer L. Stephenson; Katrina S. Maluf

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0165-0270)

Published

2011

Language

EN

Field

Neuroscience (Life Sciences)