[PDF] HIGHLIGHTED TOPIC Neural Control of Movement

View - Download HIGHLIGHTED TOPIC Neural Control of Movement

Previous PDF

Next PDF

Commentary

HIGHLIGHTED TOPICNeural Control of Movement

The dynamics of force generation has been well studied in limb muscles, but far less is known about such dynamics in orofacial muscles. In a featured article entitled “Fast force-generation dynamics of human articulatory muscles," Dr. T. Ito and colleagues (1) explored the force-generation dynamics of the human articulatory muscles of the upper and lower lips and tongue, using arm muscles to obtain comparative measure- ments in limb muscle. Twitch force responses were induced by electrical stimulations in these muscles. The dynamic re- sponses were modeled as a second order of dynamics, with model parameters identified using a nonlinear least squares method. The measured force responses fit the estimated model parameters, which suggested that lip and tongue muscles gen- erate forces significantly faster than arm muscles. Faster dy- namics of force generation enable the articulatory muscles to respond to motor commands for generating fast speech move- ments. This finding is important for investigating the mecha- nisms of speech motor control and for building a computational model of speech articulation. Another notable aspect of this

study is the methodological advantage of using electrical stim-ulation to activate muscle fibers. The dynamics of human

muscle have traditionally been studied with the use of muscle force responses generated by tasks involving voluntary con- traction. However, as this study demonstrates, voluntary tasks are not appropriate for identifying the upper limit of the dynamics of force generation, possibly because fast-twitch muscle fibers are not activated during voluntary tasks. In addition to providing essential information for studies of speech motor control and speech articulation, the findings of this study highlight the advantage of using electrical stimula- tion for estimating the upper limit of the dynamics of force generation in human muscle.

REFERENCES

1.Ito T, Murano EZ, and Gomi H.Fast force-generation dynamics of

human articulatory muscles.J Appl Physiol96: 2318-2324, 2004.

Gary C. Sieck

Journal of Applied Physiology

June 2004, Volume 96

J Appl Physiol96: 2317, 2004;

10.1152/japplphysiol.00311.2004.

8750-7587/04 $5.00 Copyright©2004 the American Physiological Societyhttp://www.jap.org2317

quotesdbs_dbs28.pdfusesText_34

[PDF] Recherche opérationnelle Les démonstrations et les exemples

[PDF] La reproduction humainepdf

[PDF] GUIDE DU RESIDENT copie

[PDF] Grossesse, accouchement et post-partum des sages-femmes et des

[PDF] Sciences des aliments

[PDF] prise de notes

[PDF] Module gratuit - Centre de Formations ? Distance

[PDF] Secrétariat

[PDF] Introduction ? la Sociologie des organisations - Rémi Bachelet

[PDF] introduction ? la sociologie support de cours - Anne Revillard

[PDF] Cours Introduction ? la sociologie politique (L1), groupe 1 Second

[PDF] cours magistral : introduction ? la sociologie politique

[PDF] Catalogue des cours en soins infirmiers - IRFSS Bretagne

[PDF] Statistique appliquée - Joseph Salmon

[PDF] Filière :SVI SEMESTRE : S3 - Faculté Polydisciplinaire Beni Mellal