Characterisation of the quadriceps stretch reflex during the transition from swing to stance phase of human walking

Experimental Brain Research
N Mrachacz-KerstingT Sinkjaer

Abstract

The main objective of this study was to characterize the stretch reflex response of the human thigh muscles to an unexpected knee flexion at the transition from stance to swing during walking. Eleven healthy subjects walked on a treadmill at their preferred speed. Reliable and constant knee flexions (6-12 degrees amplitude, 230-350 degrees /s velocity, 220 ms duration) were applied during the late swing and early stance phase of human walking by rotating the knee joint with a specifically designed portable stretch apparatus affixed to the left knee. Responses from rectus femoris (RF), vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF), medial hamstrings (MH) and medial gastrocnemius (GM) were recorded via bipolar surface electromyograms (EMG). The onset of the response in the RF, VL and VM, remained stable and independent of the time in the step cycle when the stretch was applied. Across all subjects the response onset (mean +/- SD) occurred at 23+/-1, 24+/-1 and 23+/-1 ms for RF, VL and VM, respectively. The duration of the initial response was 90-110 ms, at which time the EMG signal returned towards baseline levels. Three reflex response windows, labelled the short latency reflex (SLR), the medium latency reflex...Continue Reading

Citations

Oct 22, 2005·Experimental Brain Research·N Mrachacz-KerstingT Sinkjaer
Oct 25, 2006·Experimental Brain Research·M HodappM Faist
Feb 19, 2010·Medicine and Science in Sports and Exercise·Bryon T Ballantyne, Richard K Shields
Aug 18, 2012·Neural Plasticity·Behdad Tahayori, David M Koceja
Aug 7, 2013·The Journal of Physiology·Andrew J T StevensonNatalie Mrachacz-Kersting
Jan 18, 2011·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Maria KnikouAndrew C Smith
Nov 26, 2008·Neurophysiologie clinique = Clinical neurophysiology·J DuysensB C M Smits-Engelsman
Feb 20, 2007·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Anouk LamontagneJoyce Fung
Sep 18, 2015·Journal of Neuroengineering and Rehabilitation·Andrew Jt StevensonErika G Spaich

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