Muceli, Silvia

[["dc.bibliographiccitation.firstpage","283"],["dc.bibliographiccitation.issue","2"],["dc.bibliographiccitation.journal","Journal of Electromyography and Kinesiology"],["dc.bibliographiccitation.lastpage","290"],["dc.bibliographiccitation.volume","21"],["dc.contributor.author","Muceli, Silvia"],["dc.contributor.author","Farina, Dario"],["dc.contributor.author","Kirkesola, Gitle"],["dc.contributor.author","Katch, Frank"],["dc.contributor.author","Falla, Deborah"],["dc.date.accessioned","2018-11-07T08:57:59Z"],["dc.date.available","2018-11-07T08:57:59Z"],["dc.date.issued","2011"],["dc.description.abstract","This study compares neck force steadiness in women with neck pain and controls and the way this is influenced by short term vibration of the neck. In the first experiment, 9 women with chronic neck pain and 9 controls performed 10-s isometric cervical flexion at 15 N. Intramuscular EMG was recorded from the sternocleidomastoid muscle. In the second experiment, 10 women with neck pain and 10 controls performed 10-s isometric cervical flexion at 25% of their maximal force before and after vibration to the neck (bursts of 50 Hz with duration 20, 40, 60 and 120 s). Surface EMG was acquired from the sternocleidomastoid and splenius capitis. In both experiments, force steadiness was characterized by the coefficient of variation (CoV) and the relative power in three frequency subbands (low: 0-3 Hz; middle: 4-6 Hz; high: 8-12 Hz) of the force signal. Women with neck pain exhibited decreased force steadiness (Exp 1: patients 3.9 +/- 1.3%, controls 2.7 +/- 0.9%, P < 0.05; Exp 2: patients 3.4 +/- 1.2%, controls 1.7 +/- 0.6%, P < 0.01) which was associated with higher power in the low-frequency band (patients 71.2 +/- 9.6%, controls 56.7 +/- 9.2%, P < 0.01). Following vibration, CoV (2.6 +/- 1.1%, P < 0.05) and the power in the low-frequency band of the force signal decreased (63.1 +/- 13.9%, P < 0.05) in the patient group. These effects were not present in controls. Motor unit behavior and surface EMG amplitude were similar between groups. In conclusion, women with neck pain have reduced force steadiness, likely due to alterations in Ia afferent input. Vibration, which modulates Ia afferent input, increases force steadiness in patients with neck pain. (C) 2010 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.jelekin.2010.11.011"],["dc.identifier.isi","000287308600012"],["dc.identifier.pmid","21195628"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23536"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Sci Ltd"],["dc.relation.issn","1050-6411"],["dc.title","Reduced force steadiness in women with neck pain and the effect of short term vibration"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1615"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Journal of Neurophysiology"],["dc.bibliographiccitation.lastpage","1630"],["dc.bibliographiccitation.volume","111"],["dc.contributor.author","Muceli, Silvia"],["dc.contributor.author","Falla, Deborah"],["dc.contributor.author","Farina, Dario"],["dc.date.accessioned","2018-11-07T09:41:46Z"],["dc.date.available","2018-11-07T09:41:46Z"],["dc.date.issued","2014"],["dc.description.abstract","Muscle pain induces a complex reorganization of the motor strategy which cannot be fully explained by current theories. We tested the hypothesis that the neural control of muscles during reaching in the presence of nociceptive input is determined by a reorganization of muscle synergies with respect to control conditions. Muscle pain was induced by injection of hypertonic saline into the anterior deltoid muscle of eight men. Electromyographic (EMG) signals were recorded from 12 upper limb muscles as subjects performed a reaching task before (baseline) and after the injection of hypertonic (pain) saline, and after the pain sensation vanished. The EMG envelopes were factorized in muscle synergies, and activation signals extracted for each condition. Nociceptive stimulation resulted in a complex muscle reorganization without changes in the kinematic output. The anterior deltoid muscle activity decreased in all subjects while the changes in other muscles were subject specific. Three synergies sufficed to describe the EMG patterns in each condition, suggesting that reaching movements remain modular in the presence of experimental pain. Muscle reorganization in all subjects was accompanied by a change in the activation signals compatible with a change in the central drive to muscles. One, two or three synergies were shared between the baseline and painful conditions, depending on the subject. These results indicate that nociceptive stimulation may induce a reorganization of modular control in reaching. We speculate that such reorganization may be due to the recruitment of synergies specific to the painful condition."],["dc.identifier.doi","10.1152/jn.00147.2013"],["dc.identifier.isi","000335777100008"],["dc.identifier.pmid","24453279"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33802"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physiological Soc"],["dc.relation.issn","1522-1598"],["dc.relation.issn","0022-3077"],["dc.title","Reorganization of muscle synergies during multidirectional reaching in the horizontal plane with experimental muscle pain"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.artnumber","e0137844"],["dc.bibliographiccitation.issue","9"],["dc.bibliographiccitation.journal","PLoS ONE"],["dc.bibliographiccitation.volume","10"],["dc.contributor.author","Gizzi, Leonardo"],["dc.contributor.author","Muceli, Silvia"],["dc.contributor.author","Petzke, Frank"],["dc.contributor.author","Falla, Deborah"],["dc.date.accessioned","2018-11-07T09:51:34Z"],["dc.date.available","2018-11-07T09:51:34Z"],["dc.date.issued","2015"],["dc.description.abstract","A motor task can be performed via different patterns of muscle activation that show regularities that can be factorized in combinations of a reduced number of muscle groupings (also referred to as motor modules, or muscle synergies). In this study we evaluate whether an acute noxious stimulus induces a change in the way motor modules are combined to generate movement by neck muscles. The neck region was selected as it is a region with potentially high muscular redundancy. We used the motor modules framework to assess the redistribution of muscular activity of 12 muscles (6 per side) in the neck region of 8 healthy individuals engaged in a head and neck aiming task, in non-painful conditions (baseline, isotonic saline injection, post pain) and after the injection of hypertonic saline into the right splenius capitis muscle. The kinematics of the task was similar in the painful and control conditions. A general decrease of activity was noted for the injected muscle during the painful condition together with an increase or decrease of the activity of the other muscles. Subjects did not adopt shared control strategies (motor modules inter subject similarity at baseline 0.73 +/- 0.14); the motor modules recorded during the painful condition could not be used to reconstruct the activation patterns of the control conditions, and the painful stimulus triggered a subject-specific redistribution of muscular activation (i.e., in some subjects the activity of a given muscle increased, whereas in other subjects it decreased with pain). Alterations of afferent input (i.e., painful stimulus) influenced motor control at a multi muscular level, but not kinematic output. These findings provide new insights into the motor adaptation to pain."],["dc.description.sponsorship","Open-Access Publikationsfonds 2015"],["dc.identifier.doi","10.1371/journal.pone.0137844"],["dc.identifier.isi","000361790200040"],["dc.identifier.pmid","26382606"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/12101"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/35942"],["dc.notes.intern","Merged from goescholar"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Public Library Science"],["dc.relation.issn","1932-6203"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Experimental Muscle Pain Impairs the Synergistic Modular Control of Neck Muscles"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]