PMID: 9161366May 1, 1997Paper

Flexion relaxation of the hamstring muscles during lumbar-pelvic rhythm

Archives of Physical Medicine and Rehabilitation
T Sihvonen

Abstract

This study investigated the simultaneous activity of back muscles and hamstring muscles during sagittal forward body flexion and extension in healthy persons. The study was cross-sectional. A descriptive study of paraspinal and hamstring muscle activity in normal persons during lumbar-pelvic rhythm. A university hospital. Forty healthy volunteers (21 men, 19 women, ages 17 to 48 years), all without back pain or other pain syndromes. Surface electromyography (EMG) was used to follow activities in the back and the hamstring muscles. With movement sensors, real lumbar flexion was separated from simultaneous pelvic motion by monitoring the components of motion with a two-inclinometer method continuously from the initial upright posture into full flexion. All signals were sampled during real-time monitoring for off-line analyses. Back muscle activity ceased (ie, flexion relaxation [FR] occurred) at lumbar flexion with a mean of 79 degrees. Hamstring activity lasted longer and EMG activity ceased in the hamstrings when nearly full lumbar flexion (97%) was reached. After this point total flexion and pelvic flexion continued further, so that the last part of lumbar flexion and the last part of pelvic flexion happened without back muscl...Continue Reading

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Citations

Apr 25, 2013·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·Xinhai ShanShulong Yang
Feb 8, 2002·Clinical Biomechanics·Richard MurrayChad Zannotti
Nov 2, 2006·Spine·Paul Marshall, Bernadette Murphy
Jun 8, 2010·BMC Musculoskeletal Disorders·Martin DescarreauxVincent Cantin
May 29, 2004·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Gwanseob ShinGary Mirka
Apr 14, 2009·Journal of Manipulative and Physiological Therapeutics·Kim LalanneMartin Descarreaux
Apr 11, 2008·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Fahime HashemiradAmir H Kahlaee
Jan 19, 2000·Archives of Physical Medicine and Rehabilitation·V LeinonenO Hänninen
Sep 5, 2006·Journal of Manipulative and Physiological Therapeutics·Paul W M Marshall, Bernadette A Murphy
May 24, 2006·Manual Therapy·David A MacDonaldPaul W Hodges
Nov 1, 2005·Journal of Biomechanics·Michael OlsonLi Li
Jul 5, 2005·Manual Therapy·Wayne Hoskins, Henry Pollard
Oct 2, 2012·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Brent L Ulrey, Fadi A Fathallah
Jan 17, 2012·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Xinhai ShanYugang Wei
May 8, 2016·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Daniel Sánchez-ZuriagaGemma Biviá-Roig
Jan 1, 1998·Brain Injury : [BI]·Childers M K J Rupright P S Jones O Merveille
Jun 18, 2021·Human Factors·Seulgi KimSangeun Jin

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