Neuromuscular and biomechanical coupling in human cycling: modulation of cutaneous reflex responses to sural nerve stimulation

Experimental Brain Research
Katya MilevaDuncan L Turner

Abstract

This study tested the hypothesis that the modulation of cutaneous reflexes during human cycling would be dependent on muscle biomechanical function and phase of leg movement. The coupling between neuromuscular (electromyographic, EMG), kinetic and kinematic responses to brief innocuous (75% of the pain threshold PnT) and noxious (125% PnT) sural nerve stimulation were studied. Stimuli were delivered pseudorandomly at eight equidistant (45 degrees) positions of the crank cycle. Peak ipsilateral middle latency EMG reflex responses were calculated between 70 and 130 ms post stimulus in Biceps Femoris (BF), Rectus Femoris (RF), Tibialis Anterior (TA) and Soleus (SOL). Peak torque, knee and ankle joint angle changes were calculated between 140 and 220 ms post stimulus to quantify net kinetic and kinematic reflex modulation. Reflex responses were predominately suppressive during early activation of all muscles and facilitatory during BF and TA muscle inactivation. EMG reflex responses in monoarticular lower leg muscles TA and SOL were well correlated with ankle angle in dorsi/plantaflexion, whereas the correlation between reflex modulation in biarticular upper leg muscles (BF and RF) and knee angle changes in flexion/extension was we...Continue Reading

Citations

Jul 10, 2012·Journal of Neurophysiology·Wouter HoogkamerJacques Duysens
Mar 28, 2008·The European Journal of Neuroscience·Tsuyoshi NakajimaKimitaka Nakazawa
May 3, 2006·Clinical Neurophysiology : Official Journal of the International Federation of Clinical Neurophysiology·Masanori SakamotoTomoyoshi Komiyama
Jan 3, 2006·Progress in Neurobiology·Giorgio SandriniJean Claude Willer
Apr 3, 2009·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Andrew R ChapmanPaul W Hodges

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