Error Enhancement of the Velocity Component

Study Results

Results available

Outcome measurements, participant flow, baseline characteristics, and adverse events have been published for this study.

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Basic Information

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Recruitment Status

COMPLETED

Clinical Phase

NA

Total Enrollment

7 participants

Study Classification

INTERVENTIONAL

Study Start Date

2009-01-31

Study Completion Date

2013-05-31

Brief Summary

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The purpose of this pilot study was to explore the impact of enhancement of the velocity component error in the course of reaching movements of the impaired/hemiparetic limb in an acute stroke subject. We hypothesized that the method would shift velocity profiles toward the optimal, resulting in a reduction in error. A prototype robot. This robotic device system has a two-dimensional motor, basic measurement capacities, and a robotic arm which is engaged to the subject's upper-limb in a sitting position.

The enhancement of the velocity component error would shift velocity profiles toward the optimal, resulting in a reduction in error.

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Detailed Description

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The wrist of the subject is connected to the robotic arm by a strip which supports the arm but allows free movements of the wrist. This configuration allows subjects with impaired grasping ability to use the system. A bio-feedback system enables the subject to perform various functional motor tasks that are presented on the screen in front of him. The system's sensors detect motor errors or deviations from an optimal/proper movement trajectory or velocity profile. Any deviation in direction, velocity, acceleration or necessary force from the optimal trajectory results in applied robotic forces that enhance such errors/deviations. The sensors and the applied forces all work and compute in real time, so that the force measurements and the applied force are updated to the executed movement.

Conditions

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Stroke Hemiparesis

Study Design

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Allocation Method

RANDOMIZED

Intervention Model

SINGLE_GROUP

Primary Study Purpose

DIAGNOSTIC

Blinding Strategy

SINGLE

Participants

Study Groups

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Error Enhancement

Training of the upper extremity, using a robotic devise with error enhanced forces and traditional therapy.

Group Type EXPERIMENTAL

Error Enhancement

Intervention Type DEVICE

Patients underwent upper extremity robotic training with the error enhancement effect. Training have focused on hand reaching movements in varity of directions and range of motions.

Control treatment

Training of the upper extremity, using a robotic devise without forces applied and traditional therapy.

Group Type EXPERIMENTAL

control treatment

Intervention Type DEVICE

Patients underwent upper extremity robotic training without the error enhancement effect. Training have focused on hand reaching movements in varity of directions and range of motions.

Interventions

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Error Enhancement

Patients underwent upper extremity robotic training with the error enhancement effect. Training have focused on hand reaching movements in varity of directions and range of motions.

Intervention Type DEVICE

control treatment

Patients underwent upper extremity robotic training without the error enhancement effect. Training have focused on hand reaching movements in varity of directions and range of motions.

Intervention Type DEVICE

Other Intervention Names

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Experimental: Error Enhancement of the Velocity Component

Eligibility Criteria

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Inclusion Criteria

* Single stroke
* Two to three weeks post Stroke
* Able to understand simple commands
* Able to perform some reaching movements with the affected arm.
* No other neurological, neuromuscular, orthopedic disorders and visual deficit

Exclusion Criteria

* Perceptual, apraxic, or major cognitive deficits,
* Shoulder joint subluxation or pain in the upper-limb, and
* Spasticity \> 1 (single muscle Modified Ashworth Scale).

Minimum Eligible Age

40 Years

Maximum Eligible Age

80 Years

Eligible Sex

ALL

Accepts Healthy Volunteers

Yes