Quadriceps strength assessed by magnetic stimulation of the femoral nerve in normal subjects

Clinical Physiology and Functional Imaging
Carl-Hugo HamnegårdBjörn Bake

Abstract

Magnetic stimulation of the femoral nerve is a new technique for assessment of quadriceps strength by measurement of twitch tension (TwQ), a test that is independent of subject motivation. In this study, we sought to establish better define normal values by measurement of TwQ in 45 normal subjects. Supramaximal stimulation, as judged by TwQ, was achieved in 43 of 45 subjects at a mean of 90% of maximum stimulator output. The mean TwQ was 7.3 kilograms force (kgf) (SD 2.3) for women and 9.8 kgf (SD 2.5) for men. The mean maximal voluntary contraction (MVC) force was 48.0 kgf (SD 9.2) for women and 70.1 kgf (15.2) for men. The mean TwQ/MVC ratio was 0.15 for both women and men. Significant correlations were observed between TwQ and weight (r = 0.33, P<0.03) and height (r = 0.32, P<0.03) but these were weak and only partially explained observed variance. Our data confirm that magnetic femoral nerve stimulation is generally acceptable to naive subjects. Values are provided as a function of weight in normal subjects.

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Citations

May 3, 2014·American Journal of Respiratory and Critical Care Medicine·François MaltaisUNKNOWN ATS/ERS Ad Hoc Committee on Limb Muscle Dysfunction in COPD
May 3, 2011·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·C MinshullN P Gleeson
Nov 10, 2015·Respiratory Physiology & Neurobiology·Zhi-Hui QiuM I Polkey
Sep 3, 2008·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·C MinshullD Rees
Oct 2, 2015·Muscle & Nerve·Paul J TofariStuart Cormack
Nov 26, 2010·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Katja TomazinGuillaume Y Millet
Dec 2, 2017·Muscle & Nerve·Franco LaghiMartin J Tobin
Aug 30, 2008·Journal of Applied Physiology·Samuel VergesGuillaume Y Millet

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