Arm-free paraplegic standing. I. Control model synthesis and simulation

Matjačić, Zlatko; Bajd, Tadej

doi:10.1109/86.681178

Cited by 71 publications

(57 citation statements)

References 23 publications

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“…For these reasons, the most effective means for achieving a wide variety of postures and standing maneuvers are best explored in computer simulations that capture as many characteristics of the physical system as possible. Several musculoskeletal models have been proposed and used for the study of standing balance with FNS [8][9][10]. A major advantage of a model-based approach is the ability to examine a large number of scenarios without having to resort to difficult and potentially impractical human experimentation.…”

Section: Introductionmentioning

confidence: 99%

Posture-dependent control of stimulation in standing neuroprosthesis: Simulation feasibility study

Audu¹,

Gartman²,

Nataraj³

et al. 2014

J Rehabil Res Dev

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Abstract-We used a three-dimensional biomechanical model of human standing to test the feasibility of feed-forward control systems that vary stimulation to paralyzed muscles based on the user's posture and desire to effect a postural change. The controllers examined were (1) constant baseline stimulation, which represented muscle activation required to maintain erect standing, and (2) posture follower, which varied muscle activation as a function of the location of the projection of whole-body center of mass on the base of support. Posture-dependent control of stimulation demonstrated significant benefits over open-loop stimulation. Posture follower reduced upper-limb (UL) effort by an average of 50% compared with UL effort alone and by an average of 34% compared with baseline stimulation. On the other hand, reduction in UL effort was an average of 32% when using baseline stimulation. Compared with using UL effort alone, both controllers result in more than a 50% reduction in effort. The results of this study indicate that control systems that facilitate user-driven, task-dependent postures can be more effective and efficient than conventional open-loop stimulation. Also, they obviate the need for complicated posture-setting devices such as switches and joysticks. Functional implications include the potential to expand reachable workspace and better preparation for anticipated disturbances that could challenge balance over existing neuroprostheses for standing.

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Section: Introductionmentioning

confidence: 99%

Posture-dependent control of stimulation in standing neuroprosthesis: Simulation feasibility study

Audu¹,

Gartman²,

Nataraj³

et al. 2014

J Rehabil Res Dev

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show abstract

“…In this test, the desired stiffness level was set to 10 Nm . deg -1 (this value was chosen based on data from intact subjects from previous studies [15,16] There is experimental evidence suggesting that postural activity during quiet stance [35] and perturbed standing [23,24] can be adequately modeled as regulation of a suitable level of mechanical impedance, where the stiffness or compliant component plays the major role.…”

Section: {Xe "Closed-loop Fes Posture Control\: Two-link Case"}closedmentioning

confidence: 99%

“…The first control scheme which aims for functional FES supported standing in paraplegia by attempting to integrate the actions of the upper body and the artificial system was proposed by Matjačić and Bajd [15,16]. The control strategy is based on voluntary and reflex activity of the non-paralyzed upper body and artificially controlled mechanical stiffness in the paralyzed ankles.…”

Section: Introductionmentioning

confidence: 99%

“…The approach described in [15,16] was an engineering attempt, based on biomechanical analysis of single and double inverted pendulum stabilization requirements, addressing several crucial questions related to integration of the actions of the intact physiological system (upper body) with the actions of the FES system supporting the paralyzed physiological system (lower extremities). These questions are:…”

Section: Introductionmentioning

confidence: 99%

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Control of posture with FES systems

Matjačić

Hunt

Gollee

et al. 2003

Medical Engineering & Physics

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One of the major obstacles in restoration of functional FES supported standing in paraplegia is the lack of knowledge of a suitable control strategy. The main issue is how to integrate the purposeful actions of the non-paralysed upper body when interacting with the environment while standing, and the actions of the artificial FES control system supporting the paralyzed lower extremities. In this paper we provide a review of our approach to solving this question, which focuses on three inter-related areas: investigations of the basic mechanisms of functional postural responses in neurologically intact subjects; re-training of the residual sensory-motor activities of the upper body in paralyzed individuals; and development of closed-loop FES control systems for support of the paralyzed joints.

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“…Matjačić et al [6], [7] developed a device known as the Multipurpose Rehabilitation Frame (MRF). This frame was designed for experiments with spinal cord injured subjects using hydraulic actuators to support them during standing.…”

Section: A the Standing Framementioning

confidence: 99%

Dynamic balance training with sensory electrical stimulation in chronic stroke patients

Worms

Matjačić

Gollee

et al. 2006

2006 International Conference of the IEEE Engineering in Medicine and Biology Society

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Abstract-A case study investigating the impact of sensory electrical stimulation during perturbed stance in one chronic stroke patient is presented.A special apparatus called the BalanceTrainer was used. It allows the application of perturbations to neurologically impaired people during standing, while protecting the subject from falling. The subject underwent two different periods of perturbation training, each lasting ten days. During the first period the subject was perturbed in eight different directions. During the second period the subject was also perturbed, but was assisted by sensory electrical stimulation of the soleus, tibialis anterior, tensor fascia latae, and vastus muscles in the impaired leg. After each period of training an assessment was carried out to measure the forces the subject applied on the ground via two force plates. The subject improved his ability to balance throughout the training, with the largest improvements during the final period when electrical stimulation was used.

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Arm-free paraplegic standing. I. Control model synthesis and simulation

Cited by 71 publications

References 23 publications

Posture-dependent control of stimulation in standing neuroprosthesis: Simulation feasibility study

Posture-dependent control of stimulation in standing neuroprosthesis: Simulation feasibility study

Control of posture with FES systems

Dynamic balance training with sensory electrical stimulation in chronic stroke patients

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