Visual Feedback Reduces Co-contraction in Children With Dystonia

Young, Scott J.; Doornik, Johan van; Sanger, Terence D.

doi:10.1177/0883073810371828

Cited by 33 publications

(28 citation statements)

References 33 publications

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“…77 Two recent studies investigated the effectiveness of visual biofeedback of hand muscle activity in children with dystonia. 37,78 Children with dystonia significantly reduced their co-contraction, as well as their overflow of the non-task muscle activity when visual feedback was provided. These results indicate that children with dystonia are at least partially able to control co-contraction and reduce overflow.…”

Section: Interventionmentioning

confidence: 95%

Current and emerging strategies for treatment of childhood dystonia

Bertucco

Sanger

2015

Journal of Hand Therapy

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Childhood dystonia is a movement disorder characterized by involuntary sustained or intermittent muscle contractions causing twisting and repetitive movements, abnormal postures, or both (Sanger et al. 2003). Dystonia is a devastating neurological condition that prevents the acquisition of normal motor skills during critical periods of development in children. Moreover, it is particularly debilitating in children when dystonia affects the upper extremities such that learning and consolidation of common daily motor actions are impeded. Thus, the treatment and rehabilitation of dystonia is a challenge that continuously requires exploration of novel interventions. This review will initially describe the underlying neurophysiological mechanisms of the motor impairments found in childhood dystonia followed by the clinical measurement tools that are available to document the presence and severity of symptoms. Finally, we will discuss the state-of-the-art of therapeutic options for childhood dystonia, with particular emphasis on emergent and innovative strategies.

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Section: Interventionmentioning

confidence: 95%

Current and emerging strategies for treatment of childhood dystonia

Bertucco

Sanger

2015

Journal of Hand Therapy

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“…Additional file 6 provides an overview of studies used an instrumented method assessing the effects of an intervention (e.g. physical exercise [43], biofeedback [47,64,71,76] splints [57], deep brain stimulation [62], botulinum Toxin Type B [63], different seating types [66,80] and transcranial direct current stimulation [72][73][74].…”

Section: Assessment Of Methodological Qualitymentioning

confidence: 99%

“…(d) sEMG was also used to assess voluntary muscle activation to control tracking games on a (computer) screen e.g. tracking a target by activating biceps and triceps [47], keeping an indicator in a central position by biceps activation [43], control of position and movement of a line by left and right biceps activation [64] or tracking a target by isometrically activating intrinsic muscles [71][72][73][74].…”

Section: Movement Functionsmentioning

confidence: 99%

Instrumented assessment of motor function in dyskinetic cerebral palsy: a systematic review

Haberfehlner

Goudriaan

Bonouvrié

et al. 2020

J NeuroEngineering Rehabil

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Background: In this systematic review we investigate which instrumented measurements are available to assess motor impairments, related activity limitations and participation restrictions in children and young adults with dyskinetic cerebral palsy. We aim to classify these instrumented measurements using the categories of the international classification of functioning, disability and health for children and youth (ICF-CY) and provide an overview of the outcome parameters. Methods: A systematic literature search was performed in November 2019. We electronically searched Pubmed, Embase and Scopus databases. Search blocks included (a) cerebral palsy, (b) athetosis, dystonia and/or dyskinesia, (c) age 2-24 years and (d) instrumented measurements (using keywords such as biomechanics, sensors, smartphone, and robot). Results: Our search yielded 4537 articles. After inspection of titles and abstracts, a full text of 245 of those articles were included and assessed for further eligibility. A total of 49 articles met our inclusion criteria. A broad spectrum of instruments and technologies are used to assess motor function in dyskinetic cerebral palsy, with the majority using 3D motion capture and surface electromyography. Only for a small number of instruments methodological quality was assessed, with only one study showing an adequate assessment of test-retest reliability. The majority of studies was at ICF-CY function and structure level and assessed control of voluntary movement (29 of 49) mainly in the upper extremity, followed by assessment of involuntary movements (15 of 49), muscle tone/motor reflex (6 of 49), gait pattern (5 of 49) and muscle power (2 of 49). At ICF-CY level of activities and participation hand and arm use (9 of 49), fine hand use (5 of 49), lifting and carrying objects (3 of 49), maintaining a body position (2 of 49), walking (1 of 49) and moving around using equipment (1 of 49) was assessed. Only a few methods are potentially suitable outside the clinical environment (e.g. inertial sensors, accelerometers). Conclusion: Although the current review shows the potential of several instrumented methods to be used as objective outcome measures in dyskinetic cerebral palsy, their methodological quality is still unknown. Future development should focus on evaluating clinimetrics, including validating against clinical meaningfulness. New technological developments should aim for measurements that can be applied outside the laboratory.

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“…The previous work provides evidence (in the form of comparing signal-to-noise ratios and graphs of force and various filtered EMG outputs) that Bayesian filtering improves the estimation of torque. This algorithm has been used in studies of biofeedback (Bloom et al 2010) and motor control (Young et al 2011(Young et al , 2014. While one might expect the higher signal-to-noise ratio of the Bayesian filter (Sanger 2007) to translate into better control, it cannot be assumed that subjects will make appropriate use of the filtering method, nor can we determine a priori whether the magnitude of the improvement will be sufficient to have a significant effect on performance.…”

Section: Introductionmentioning

confidence: 99%

Comparison of speed-accuracy tradeoff between linear and nonlinear filtering algorithms for myocontrol

Borish

Feinman

Bertucco

et al. 2018

Journal of Neurophysiology

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Nonlinear Bayesian filtering of surface electromyography (EMG) can provide a stable output signal with little delay and the ability to change rapidly, making it a potential control input for prosthetic or communication devices. We hypothesized that myocontrol follows Fitts' Law, and that Bayesian filtered EMG would improve movement times and success rates when compared with linearly filtered EMG. We tested the two filters using a Fitts' Law speed-accuracy paradigm in a one-muscle myocontrol task with EMG captured from the dominant first dorsal interosseous muscle. Cursor position in one dimension was proportional to EMG. Six indices of difficulty were tested, varying the target size and distance. We examined two performance measures: movement time (MT) and success rate. The filter had a significant effect on both MT and success. MT followed Fitts' Law and the speed-accuracy relationship exhibited a significantly higher channel capacity when using the Bayesian filter. Subjects seemed to be less cautious using the Bayesian filter due to its lower error rate and smoother control. These findings suggest that Bayesian filtering may be a useful component for myoelectrically controlled prosthetics or communication devices. NEW & NOTEWORTHY Whereas previous work has focused on assessing the Bayesian algorithm as a signal processing algorithm for EMG, this study assesses the use of the Bayesian algorithm for online EMG control. In other words, the subjects see the output of the filter and can adapt their own behavior to use the filter optimally as a tool. This study compares how subjects adapt EMG behavior using the Bayesian algorithm vs. a linear algorithm.

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Visual Feedback Reduces Co-contraction in Children With Dystonia

Cited by 33 publications

References 33 publications

Current and emerging strategies for treatment of childhood dystonia

Current and emerging strategies for treatment of childhood dystonia

Instrumented assessment of motor function in dyskinetic cerebral palsy: a systematic review

Comparison of speed-accuracy tradeoff between linear and nonlinear filtering algorithms for myocontrol

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