Movements modulate the reflex responses of human flexor pollicis longus to stretch

Experimental Brain Research
C J Wallace, T S Miles

Abstract

The reflex responses to brisk, ramp stretch perturbations of the human flexor pollicis longus muscle (FPL) were recorded during isometric and slow concentric or eccentric contractions at similar levels of muscle excitation. The subjects flexed their thumb to push down against a thumb-rest, whose position was controlled by a servo-controlled motor. In different runs, the stretch perturbations were imposed when the thumb-rest was stationary (isometric) or was flexing or extending the interphalangeal joint of the thumb at a constant velocity, i.e. during concentric or eccentric contractions of FPL. The latency of the most prominent component of the electromyographic reflex in the isometrically contracting muscle was about 60 ms, measured from the command signal. The amplitude of this response was sharply reduced during the non-isometric contractions. While not dependent on the direction, this modulation of the reflex response increased with the speed of active movement of the interphalangeal joint (flexion or extension). The response was greatly reduced during concentric or eccentric movements as slow as 1.6 mm x s[-1] (approximately 5 degrees x s (-1) at the joint). When the force rather than the position of the thumb-rest was se...Continue Reading

Citations

Oct 27, 2004·Experimental Brain Research·C M AlexanderP J Harrison
Jan 24, 2002·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·K OgisoP V Komi
Jan 24, 2002·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·K OgisoP V Komi
Dec 2, 2005·Journal of Neurophysiology·Vladimir M ZatsiorskyMark L Latash
Feb 19, 2008·The European Journal of Neuroscience·S M SchabrunT S Miles
Apr 7, 2005·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·K OgisoP V Komi
May 23, 1998·The Journal of Physiology·J F YangR Vishram
Dec 26, 2003·Journal of Neurophysiology·Valerie K HaftelTimothy C Cope

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