NDLI: Increase in group II excitation from ankle muscles to thigh motoneurones during human standing

Content Provider	PubMed Central
Author	Marchand-pauvert, Véronique Nicolas, Guillaume Marque, Philippe Iglesias, Caroline Emmanuel, Pierrot-deseilligny
Copyright Year	2005
Abstract	In standing subjects, we investigated the excitation of quadriceps (Q) motoneurones by muscle afferents from tibialis anterior (TA) and the excitation of semitendinosus (ST) motoneurones by muscle afferents from gastrocnemius medialis (GM). Standing with a backward lean stretches the anterior muscle pair (TA and Q) and they must be cocontracted to maintain balance. Equally, forward lean stretches the posterior muscle pair (GM and ST) and they must be cocontracted. We used these conditions of enhanced lean to increase the influence of γ static motoneurones on muscle spindle afferents, which enhances the background input from these afferents to extrafusal motoneurones. The effects of the conditioning volleys on motoneurone excitability was estimated using the modulation of the on-going rectified EMG and of the H reflex. Stimulation of afferents from TA in the deep peroneal nerve at 1.5–2 × MT (motor threshold) evoked early group I and late group II excitation of Q motoneurones. Stimulation of afferents in the GM nerve at 1.3–1.8 MT evoked only late group II excitation of ST motoneurones. The late excitation produced by the group II afferents was significantly greater when subjects were standing and leaning than when they voluntarily cocontracted the same muscle pairs at the same levels of activation. The early effect produced by the group I afferents was unchanged. We propose that this increase in excitation by group II afferents reflects a posture-related withdrawal of a tonic inhibition that is exerted by descending noradrenergic control and is specific to the synaptic actions of group II afferents.
Related Links	http://dx.doi.org/10.1113/jphysiol.2005.087817
Starting Page	257
File Format	PDF
ISSN	14697793
e-ISSN	14697793
Journal	The Journal of Physiology
Issue Number	Pt 1
Volume Number	566
Language	English
Publisher	Blackwell Science Inc
Publisher Date	2005-07-01
Access Restriction	Open
Rights Holder	Blackwell Science Inc
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Sports Science

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