Muscular contributions to dynamic dorsoventral lumbar spine stiffness.

European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society
T S KellerRobert Gunzburg

Abstract

Spinal musculature plays a major role in spine stability, but its importance to spinal stiffness is poorly understood. We studied the effects of graded trunk muscle stimulation on the in vivo dynamic dorsoventral (DV) lumbar spine stiffness of 15 adolescent Merino sheep. Constant voltage supramaximal electrical stimulation was administered to the L3-L4 interspinous space of the multifidus muscles using four stimulation frequencies (2.5, 5, 10, and 20 Hz). Dynamic stiffness was quantified at rest and during muscle stimulation using a computer-controlled testing apparatus that applied variable frequency (0.46-19.7 Hz) oscillatory DV forces (13-N preload to 48-N peak) to the L3 spinous process of the prone-lying sheep. Five mechanical excitation trials were randomly performed, including four muscle stimulation trials and an unstimulated or resting trial. The secant stiffness (k (y) = DV force/L3 displacement, kN/m) and loss angle (phase angle, deg) were determined at 44 discrete mechanical excitation frequencies. Results indicated that the dynamic stiffness varied 3.7-fold over the range of mechanical excitation frequencies examined (minimum resting k (y) = 3.86 +/- 0.38 N/mm at 4.0 Hz; maximum k (y) = 14.1 +/- 9.95 N/mm at 19.7 H...Continue Reading

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Citations

Oct 29, 2011·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Catherine Marty-PoumaratMartine Cohen-Solal
Feb 18, 2016·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Jung-Hee LeeHyuk Jung
Feb 20, 2016·Journal of Bodywork and Movement Therapies·Leonid KalichmanTomer Bezalel
Jun 5, 2012·Journal of Manipulative and Physiological Therapeutics·Christopher J CollocaRobert J Moore
Dec 15, 2010·Journal of Bodywork and Movement Therapies·Zachary Comeaux
Mar 11, 2016·Clinical Biomechanics·Marek SzpalskiLaurent Fabeck
Jan 1, 2008·Manual Therapy·Manuela Loureiro FerreiraKathryn Refshauge
May 1, 2007·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Christopher J CollocaDeed E Harrison
Feb 11, 2011·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Shrawan Kumar, Scott Stoll

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