Reliability and Sensitivity of a Wrist Rig to Measure Motor Control and Spasticity in Poststroke Hemiplegia

Turk, Ruth; Pickering, Ruth; Simpson, David M.; Wright, Philip; Burridge, Jane

doi:10.1177/1545968308315599

Cited by 29 publications

(66 citation statements)

References 44 publications

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“…An instrumented wrist rig specifically designed to detect changes in the upper limb was used for all data collection [21]. To measure angle and forces at the wrist joint, the wrist rig is fitted with a potentiometer and a pair of strain gauges, which are calibrated before they are used.…”

Section: Resultsmentioning

confidence: 99%

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Repetitive control based tremor suppression using electrical stimulation

Copur

Freeman

Chu

et al. 2014

2014 UKACC International Conference on Control (CONTROL)

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Tremor is a common, debilitating movement condition commonly occurring in neurological disorders, with invasive and pharmacological treatment methods often ineffective. Functional electrical stimulation (FES) holds potential to supress tremor, but previous control methods have proven of limited success. This paper establishes the feasibility of using repetitive control, a framework which is able to eliminate the effect of periodic disturbances by including an internal model of the oscillation within the control structure. A model of the wrist is developed and two different repetitive control algorithms are applied to suppress tremor via stimulation of wrist flexors and extensors. Experimental results are compared with filter-based methods to establish the efficacy of the proposed approach.

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Section: Resultsmentioning

confidence: 99%

“…Experimental set-up (Permission obtained to reproduce[21]) showing a) how the participant's arm is supported by the wrist rig b) an overhead view of the wrist. of the muscle system, and then estimates the IRC by crossplotting the deconvolved signal against the input ramp signal.…”

mentioning

confidence: 99%

Repetitive control based tremor suppression using electrical stimulation

Copur

Freeman

Chu

et al. 2014

2014 UKACC International Conference on Control (CONTROL)

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“…Due to the problems associated with the clinical measurement and subsequent quantification of spasticity devices have been constructed to objectively quantify reflex and non-reflex stiffness over the wrist/ fingers [9,10], knee [11] and ankle [12][13][14][15][16]. Although these devices have taken positive steps towards the quantification of the different elements of stiffness to be clinically routine they must fulfil a number of requirements without sacrificing the accuracy of the measurements.…”

Section: Commentarymentioning

confidence: 99%

Objective Quantification of Wrist and Finger Spasticity: An Alternative to Current Clinical Measurements: A Commentary

Stubbs¹,

Figlewski²,

Nielsen³

2014

J Nov Physiother

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Contractures and spasticity are two commonly occurring phenomena following neurological lesions. These require different medical management but are often difficult to separate using the current clinical methods. This commentary outlines a newly available device (the Neuroflexor™) used to quantify the elastic, viscous and reflex components of wrist/finger stiffness. The device and algorithm used to quantify stiffness is described. In addition, positive and negative aspects of the device and considerations for use are provided. Stubbs PW, et al., J Nov Physiother 2014, 4:4 http://dx. Novel Physiotherapies

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“…Testing apparatus 1) Wrist Rig: A wrist rig was employed that has been specifically designed and validated to detect changes in upper limb function [42]. The participant's arm was supported by two Velcro straps wrapped around the top and bottom of the elbow, and by a foam splint supporting the forearm, as shown in Fig.…”

Section: Experimental Test Proceduresmentioning

confidence: 99%

“…3) Data Collection: In Phase 1 of the study the following tests were performed to fully evaluate the control approaches Tracking Test T1 comprised a step-tracking task [42], in which participants were instructed to flex or extend their wrist to track the position indicated by the LEDs which were illuminated in a pseudo-random pattern. Each LED was lit for 6 seconds and the test lasted for 40 seconds.…”

Section: ) Fes Devicementioning

confidence: 99%

Repetitive Control of Electrical Stimulation for Tremor Suppression

Copur

Freeman

Chu

et al. 2019

IEEE Trans. Contr. Syst. Technol.

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Abstract-Tremor is a rapid involuntary movement often seen in patients with neurological conditions such as Multiple Sclerosis (MS) and Parkinson's disease. This debilitating oscillation can be suppressed by applying functional electrical stimulation (FES) within a closed-loop control system. However, conventional implementations use classical control methods and have proved capable of only limited performance. This paper establishes the feasibility of embedding repetitive control (RC) action to exploit the capability of learning from experience to completely suppress tremor at the wrist via FES regulated co-contraction of wrist extensors/flexors. A nonlinear model structure and associated identification procedure is first proposed to guarantee stability and performance of the RC system. Then a linearising control approach is developed to facilitate transparent RC design, together with a mechanism to preserve patients' voluntary intention. Experimental evaluation is performed with both unimpaired and neurologically impaired participants using a validated wristrig. For the former group a novel electromechanical system is employed to induce tremor artificially. Results are benchmarked against a well-known classical filtering technique to establish the efficacy of the RC approach. These confirm that the proposed control system with the developed model identification procedure can increase tremor suppression by 43.3% compared with conventional filtering. In addition, the mechanism decreases the interference of RC action with voluntary motion by 20.2% compared with conventional filtering.

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Reliability and Sensitivity of a Wrist Rig to Measure Motor Control and Spasticity in Poststroke Hemiplegia

Cited by 29 publications

References 44 publications

Repetitive control based tremor suppression using electrical stimulation

Repetitive control based tremor suppression using electrical stimulation

Objective Quantification of Wrist and Finger Spasticity: An Alternative to Current Clinical Measurements: A Commentary

Repetitive Control of Electrical Stimulation for Tremor Suppression

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