Falla, Deborah Lorraine

[["dc.bibliographiccitation.firstpage","628"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Clinical Journal of Pain"],["dc.bibliographiccitation.lastpage","634"],["dc.bibliographiccitation.volume","28"],["dc.contributor.author","Falla, Deborah"],["dc.contributor.author","O'Leary, Shaun"],["dc.contributor.author","Farina, Dario"],["dc.contributor.author","Jull, Gwendolen"],["dc.date.accessioned","2018-11-07T09:06:51Z"],["dc.date.available","2018-11-07T09:06:51Z"],["dc.date.issued","2012"],["dc.description.abstract","Objectives: Altered activation of the deep cervical flexors (longus colli and longus capitis) has been found in individuals with neck pain disorders but the response to training has been variable. Therefore, this study investigated the relationship between change in deep cervical flexor muscle activity and symptoms in response to specific training. Methods: Fourteen women with chronic neck pain undertook a 6-week program of specific training that consisted of a craniocervical flexion exercise performed twice per day (10 to 20 min) for the duration of the trial. The exercise targets the deep flexor muscles of the upper cervical region. At baseline and follow-up, measures were taken of neck pain intensity (visual analogue scale, 0 to 10), perceived disability (Neck Disability Index, 0 to 50) and electromyography (EMG) of the deep cervical flexors (by a nasopharyngeal electrode suctioned over the posterior oropharyngeal wall) during performance of craniocervical flexion. Results: After training, the activation of the deep cervical flexors increased (P < 0.0001) with the greatest change occurring in patients with the lowest values of deep cervical flexor EMG amplitude at baseline (R-2 = 0.68; P < 0.001). There was a significant relationship between initial pain intensity, change in pain level with training, and change in EMG amplitude for the deep cervical flexors during craniocervical flexion (R-2 = 0.34; P < 0.05). Discussion: Specific training of the deep cervical flexor muscles in women with chronic neck pain reduces pain and improves the activation of these muscles, especially in those with the least activation of their deep cervical flexors before training. This finding suggests that the selection of exercise based on a precise assessment of the patients' neuromuscular control and targeted exercise interventions based on this assessment are likely to be the most beneficial to patients with neck pain."],["dc.description.sponsorship","NHMRC of Australia"],["dc.identifier.doi","10.1097/AJP.0b013e31823e9378"],["dc.identifier.isi","000307640500011"],["dc.identifier.pmid","22156825"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/25644"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Lippincott Williams & Wilkins"],["dc.relation.issn","0749-8047"],["dc.title","The Change in Deep Cervical Flexor Activity After Training Is Associated With the Degree of Pain Reduction in Patients With Chronic Neck Pain"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["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","2534"],["dc.bibliographiccitation.issue","6"],["dc.bibliographiccitation.journal","Clinical Neurophysiology"],["dc.bibliographiccitation.lastpage","2541"],["dc.bibliographiccitation.volume","127"],["dc.contributor.author","Martinez-Valdes, Eduardo"],["dc.contributor.author","Laine, C. M."],["dc.contributor.author","Falla, Deborah"],["dc.contributor.author","Mayer, F."],["dc.contributor.author","Farina, Dario"],["dc.date.accessioned","2018-11-07T10:13:54Z"],["dc.date.available","2018-11-07T10:13:54Z"],["dc.date.issued","2016"],["dc.description.abstract","Objective: To assess the intra-and inter-session reliability of estimates of motor unit behavior and muscle fiber properties derived from high-density surface electromyography (HDEMG). Methods: Ten healthy subjects performed submaximal isometric knee extensions during three recording sessions (separate days) at 10%, 30%, 50% and 70% of their maximum voluntary effort. The discharge timings of motor units of the vastus lateralis and medialis muscles were automatically identified from HDEMG by a decomposition algorithm. We characterized the number of detected motor units, their discharge rates, the coefficient of variation of their inter-spike intervals (CoVisi), the action potential conduction velocity and peak-to-peak amplitude. Reliability was assessed for each motor unit characteristics by intra-class correlation coefficient (ICC). Additionally, a pulse-to-noise ratio (PNR) was calculated, to verify the accuracy of the decomposition. Results: Good to excellent reliability within and between sessions was found for all motor unit characteristics at all force levels (ICCs > 0.8), with the exception of CoVisi that presented poor reliability (ICC < 0.6). PNR was high and similar for both muscles with values ranging between 45.1 and 47.6 dB (accuracy > 95%). Conclusion: Motor unit features can be assessed non-invasively and reliably within and across sessions over a wide range of force levels. Significance: These results suggest that it is possible to characterize motor units in longitudinal intervention studies. (C) 2016 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.clinph.2015.10.065"],["dc.identifier.isi","000375569100032"],["dc.identifier.pmid","26778718"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/40516"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Ireland Ltd"],["dc.relation.issn","1872-8952"],["dc.relation.issn","1388-2457"],["dc.title","High-density surface electromyography provides reliable estimates of motor unit behavior"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","2547"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Experimental Brain Research"],["dc.bibliographiccitation.lastpage","2559"],["dc.bibliographiccitation.volume","235"],["dc.contributor.author","De Nunzio, Alessandro Marco"],["dc.contributor.author","Dosen, Strahinja"],["dc.contributor.author","Lemling, Sabrina"],["dc.contributor.author","Markovic, Marko"],["dc.contributor.author","Schweisfurth, Meike Annika"],["dc.contributor.author","Ge, Nan"],["dc.contributor.author","Graimann, Bernhard"],["dc.contributor.author","Falla, Deborah"],["dc.contributor.author","Farina, Dario"],["dc.date.accessioned","2019-07-09T11:44:27Z"],["dc.date.available","2019-07-09T11:44:27Z"],["dc.date.issued","2017"],["dc.description.abstract","Grasping is a complex task routinely performed in an anticipatory (feedforward) manner, where sensory feedback is responsible for learning and updating the internal model of grasp dynamics. This study aims at evaluating whether providing a proportional tactile force feedback during the myoelectric control of a prosthesis facilitates learning a stable internal model of the prosthesis force control. Ten able-bodied subjects controlled a sensorized myoelectric prosthesis performing four blocks of consecutive grasps at three levels of target force (30, 50, and 70%), repeatedly closing the fully opened hand. In the first and third block, the subjects received tactile and visual feedback, respectively, while during the second and fourth block, the feedback was removed. The subjects also performed an additional block with no feedback 1 day after the training (Retest). The median and interquartile range of the generated forces was computed to assess the accuracy and precision of force control. The results demonstrated that the feedback was indeed an effective instrument for the training of prosthesis control. After the training, the subjects were still able to accurately generate the desired force for the low and medium target (30 and 50% of maximum force available in a prosthesis), despite the feedback being removed within the session and during the retest (low target force). However, the training was substantially less successful for high forces (70% of prosthesis maximum force), where subjects exhibited a substantial loss of accuracy as soon as the feedback was removed. The precision of control decreased with higher forces and it was consistent across conditions, determined by an intrinsic variability of repeated myoelectric grasping. This study demonstrated that the subject could rely on the tactile feedback to adjust the motor command to the prosthesis across trials. The subjects adjusted the mean level of muscle activation (accuracy), whereas the precision could not be modulated as it depends on the intrinsic myoelectric variability. They were also able to maintain the feedforward command even after the feedback was removed, demonstrating thereby a stable learning, but the retention depended on the level of the target force. This is an important insight into the role of feedback as an instrument for learning of anticipatory prosthesis force control."],["dc.identifier.doi","10.1007/s00221-017-4991-7"],["dc.identifier.pmid","28550423"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/14765"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/59015"],["dc.notes.intern","Merged from goescholar"],["dc.rights","CC BY 4.0"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.title","Tactile feedback is an effective instrument for the training of grasping with a prosthesis at low- and medium-force levels"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1455"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","Journal of Applied Physiology"],["dc.bibliographiccitation.lastpage","1466"],["dc.bibliographiccitation.volume","109"],["dc.contributor.author","Vila-Cha, Carolina"],["dc.contributor.author","Falla, Deborah"],["dc.contributor.author","Farina, Dario"],["dc.date.accessioned","2018-11-07T08:37:35Z"],["dc.date.available","2018-11-07T08:37:35Z"],["dc.date.issued","2010"],["dc.description.abstract","The study investigated changes in motor output and motor unit behavior following 6 wk of either strength or endurance training programs commonly used in conditioning and rehabilitation. Twenty-seven sedentary healthy men (age, 26.1 +/- 3.9 yr; mean +/- SD) were randomly assigned to strength training (ST; n = 9), endurance training (ET; n = 10), or a control group (CT; n = 8). Maximum voluntary contraction (MVC), time to task failure (isometric contraction at 30% MVC), and rate of force development (RFD) of the quadriceps were measured before (week 0), during (week 3), and after a training program of 6 wk. In each experimental session, surface and intramuscular EMG signals were recorded from the vastus medialis obliquus and vastus lateralis muscles during isometric knee extension at 10 and 30% MVC. After 6 wk of training, MVC and RFD increased in the ST group (17.5 +/- 7.5 and 33.3 +/- 15.9%, respectively; P < 0.05), whereas time to task failure was prolonged in the ET group (29.7 +/- 13.4%; P < 0.05). The surface EMG amplitude at 30% MVC force increased with training in both groups, but the training-induced changes in motor unit discharge rates differed between groups. After endurance training, the motor unit discharge rate at 30% MVC decreased from 11.3 +/- 1.3 to 10.1 +/- 1.1 pulses per second (pps; P < 0.05) in the vasti muscles, whereas after strength training it increased from 11.4 +/- 1.2 to 12.7 +/- 1.3 pps (P < 0.05). Finally, motor unit conduction velocity during the contractions at 30% MVC increased for both the ST and ET groups, but only after 6 wk of training (P < 0.05). In conclusion, these strength and endurance training programs elicit opposite adjustments in motor unit discharge rates but similar changes in muscle fiber conduction velocity."],["dc.identifier.doi","10.1152/japplphysiol.01213.2009"],["dc.identifier.isi","000285346000023"],["dc.identifier.pmid","20829500"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/18571"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physiological Soc"],["dc.relation.issn","8750-7587"],["dc.title","Motor unit behavior during submaximal contractions following six weeks of either endurance or strength training"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1403"],["dc.bibliographiccitation.issue","7"],["dc.bibliographiccitation.journal","Clinical Neurophysiology"],["dc.bibliographiccitation.lastpage","1408"],["dc.bibliographiccitation.volume","123"],["dc.contributor.author","Schomacher, Jochen"],["dc.contributor.author","Farina, Dario"],["dc.contributor.author","Lindstroem, Rene"],["dc.contributor.author","Falla, Deborah"],["dc.date.accessioned","2018-11-07T09:09:03Z"],["dc.date.available","2018-11-07T09:09:03Z"],["dc.date.issued","2012"],["dc.description.abstract","Objective: The deep cervical extensors show structural changes in patients with neck pain however their activation has never been investigated in patients. This study is the first to present neurophysiological data from the deep semispinalis cervicis muscle in patients. Methods: Ten women with chronic neck pain and 10 healthy controls participated. Activity of the semispinalis cervicis was measured as subjects performed isometric contractions at 15 and 30 N force with continuous change in force direction in the range 0-360 degrees. Tuning curves of the EMG amplitude (average rectified value, ARV) were computed and the mean point of the ARV curves defined a directional vector, which determined the directional specificity of the muscle activity. Results: Patients displayed reduced directional specificity of the semispinalis cervicis (P < 0.05). Furthermore, the EMG amplitude during the circular contraction was lower for the patients (86.3 +/- 38.0 and 104.4 +/- 47.0 mu V for 15 and 30 N, respectively) compared to controls (226.4 +/- 128.5 and 315.8 +/- 205.5 mu V; P < 0.05). Conclusions: The activity of the semispinalis cervicis muscle is reduced and less defined in patients with neck pain confirming a disturbance in the neural control of this muscle. Significance: This finding suggests that exercises that target the deep semispinalis cervicis muscle may be relevant to include in the management of patients with neck pain. (C) 2011 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.clinph.2011.11.033"],["dc.identifier.isi","000304620100020"],["dc.identifier.pmid","22206690"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/26175"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Elsevier Ireland Ltd"],["dc.relation.issn","1388-2457"],["dc.title","Chronic trauma-induced neck pain impairs the neural control of the deep semispinalis cervicis muscle"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","309"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Clinical Journal of Pain"],["dc.bibliographiccitation.lastpage","314"],["dc.bibliographiccitation.volume","27"],["dc.contributor.author","Falla, Deborah"],["dc.contributor.author","O'Leary, Shaun"],["dc.contributor.author","Farina, Dario"],["dc.contributor.author","Jull, Gwendolen"],["dc.date.accessioned","2018-11-07T08:56:49Z"],["dc.date.available","2018-11-07T08:56:49Z"],["dc.date.issued","2011"],["dc.description.abstract","Objectives: This study evaluates the relationship between clinical symptoms and the function of the deep cervical flexor muscles in women with persistent neck pain. Methods: Thirty-two women with a history of neck pain more than 6 months participated in the study. Measures for neck pain area, intensity, duration, and perceived disability were taken. Electromyography was acquired from the deep cervical flexor muscles by a nasopharyngeal electrode suctioned over the posterior oropharyngeal wall as the patients performed 2 tasks: rapid arm movements (shoulder flexion and extension) and isometric craniocervical flexion contractions. Results: The patients' average score for the Neck Disability Index (0 to 50) was 11.0 +/- 2.6 and their average pain intensity rated on a visual analog scale (0 to 10) was 4.7 +/- 1.8. A correlation was observed between the average intensity of pain rated on the visual analog scale and the normalized electromyography amplitude recorded from the deep cervical flexors during the craniocervical flexion contractions (r=-0.36; P<0.05). Furthermore, the relative onset of the deep cervical flexors during rapid shoulder flexion was positively correlated with the average intensity of pain (r=0.50; P<0.01). No significant correlations were identified between the amplitude and the onset of activation of the deep cervical flexors and the duration of pain, area of pain, or Neck Disability Index score of the patient. Discussion: This study shows a relationship between the levels of neck pain intensity and the function of the deep cervical flexor muscles in women with persistent neck pain but not in other clinical features, such as location or duration of the disorder. These findings may partially explain the heterogeneity in motor control impairments in patients with neck pain."],["dc.identifier.doi","10.1097/AJP.0b013e31820212cf"],["dc.identifier.isi","000289263800005"],["dc.identifier.pmid","21178596"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/23244"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Lippincott Williams & Wilkins"],["dc.relation.issn","1536-5409"],["dc.relation.issn","0749-8047"],["dc.title","Association Between Intensity of Pain and Impairment in Onset and Activation of the Deep Cervical Flexors in Patients With Persistent Neck Pain"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1479"],["dc.bibliographiccitation.issue","5"],["dc.bibliographiccitation.journal","The Journal of Physiology"],["dc.bibliographiccitation.lastpage","1496"],["dc.bibliographiccitation.volume","595"],["dc.contributor.author","Negro, F."],["dc.contributor.author","Laine, C. M."],["dc.contributor.author","Mayer, F."],["dc.contributor.author","Martinez-Valdes, Eduardo"],["dc.contributor.author","Falla, Deborah"],["dc.contributor.author","Farina, Dario"],["dc.date.accessioned","2020-12-10T18:36:34Z"],["dc.date.available","2020-12-10T18:36:34Z"],["dc.date.issued","2017"],["dc.description.abstract","A new method is proposed for tracking individual motor units (MUs) across multiple experimental sessions on different days. The technique is based on a novel decomposition approach for high-density surface electromyography and was tested with two experimental studies for reliability and sensitivity. Experiment I (reliability): ten participants performed isometric knee extensions at 10, 30, 50 and 70% of their maximum voluntary contraction (MVC) force in three sessions, each separated by 1 week. Experiment II (sensitivity): seven participants performed 2 weeks of endurance training (cycling) and were tested pre-post intervention during isometric knee extensions at 10 and 30% MVC. The reliability (Experiment I) and sensitivity (Experiment II) of the measured MU properties were compared for the MUs tracked across sessions, with respect to all MUs identified in each session. In Experiment I, on average 38.3% and 40.1% of the identified MUs could be tracked across two sessions (1 and 2 weeks apart), for the vastus medialis and vastus lateralis, respectively. Moreover, the properties of the tracked MUs were more reliable across sessions than those of the full set of identified MUs (intra-class correlation coefficients ranged between 0.63-0.99 and 0.39-0.95, respectively). In Experiment II, similar to 40% of the MUs could be tracked before and after the training intervention and training-induced changes in MU conduction velocity had an effect size of 2.1 (tracked MUs) and 1.5 (group of all identified motor units). These results show the possibility of monitoring MU properties longitudinally to document the effect of interventions or the progression of neuromuscular disorders."],["dc.identifier.doi","10.1113/JP273662"],["dc.identifier.isi","000398112300016"],["dc.identifier.issn","0022-3751"],["dc.identifier.pmid","28032343"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/76674"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Wiley"],["dc.relation.issn","1469-7793"],["dc.relation.issn","0022-3751"],["dc.title","Tracking motor units longitudinally across experimental sessions with high-density surface electromyography"],["dc.title.alternative","Motor unit tracking with high-density EMG"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","54"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Journal of Applied Physiology"],["dc.bibliographiccitation.lastpage","63"],["dc.bibliographiccitation.volume","112"],["dc.contributor.author","Vila-Cha, Carolina"],["dc.contributor.author","Falla, Deborah"],["dc.contributor.author","Correia, Miguel Velhote"],["dc.contributor.author","Farina, Dario"],["dc.date.accessioned","2018-11-07T09:16:06Z"],["dc.date.available","2018-11-07T09:16:06Z"],["dc.date.issued","2012"],["dc.description.abstract","Vila-Cha C, Falla D, Correia MV, Farina D. Changes in H reflex and V wave following short-term endurance and strength training. J Appl Physiol 112: 54-63, 2012. First published October 13, 2011; doi:10.1152/japplphysiol.00802.2011.-This study examined the effects of 3 wk of either endurance or strength training on plasticity of the neural mechanisms involved in the soleus H reflex and V wave. Twenty-five sedentary healthy subjects were randomized into an endurance group (n = 13) or strength group (n = 12). Evoked V-wave, H-reflex, and M-wave recruitment curves, maximal voluntary contraction (MVC), and time-to-task-failure (isometric contraction at 40% MVC) of the plantar flexors were recorded before and after training. Following strength training, MVC of the plantar flexors increased by 14.4 +/- 5.2% in the strength group (P < 0.001), whereas time-to-task-failure was prolonged in the endurance group (22.7 +/- 17.1%; P < 0.05). The V wave-to-maximal M wave (V/M-max) ratio increased significantly (55.1 +/- 28.3%; P < 0.001) following strength training, but the maximal H wave-to-maximal M wave (H-max/M-max) ratio remained unchanged. Conversely, in the endurance group the V/Mmax ratio was not altered, whereas the Hmax/Mmax ratio increased by 30.8 +/- 21.7% (P < 0.05). The endurance training group also displayed a reduction in the H-reflex excitability threshold while the H-reflex amplitude on the ascending limb of the recruitment curve increased. Strength training only elicited a significant decrease in H-reflex excitability threshold, while H-reflex amplitudes over the ascending limb remained unchanged. These observations indicate that the H-reflex pathway is strongly involved in the enhanced endurance resistance that occurs following endurance training. On the contrary, the improvements in MVC following strength training are likely attributed to increased descending drive and/or modulation in afferents other than Ia afferents."],["dc.identifier.doi","10.1152/japplphysiol.00802.2011"],["dc.identifier.isi","000298403700008"],["dc.identifier.pmid","21998264"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/27860"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Amer Physiological Soc"],["dc.relation.issn","8750-7587"],["dc.title","Changes in H reflex and V wave following short-term endurance and strength training"],["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"]]