Error Enhancement of the Velocity Component

Completed

Phase N/A Results

Trial Description

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.

Detailed Description

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

Interventions

  • Error Enhancement deXtreme's prototype robot Device
    Other Names: Experimental: Error Enhancement of the Velocity Component; Control: No external force
    Intervention Desc: Error Enhancement of the Velocity Component: The subjects were seated on comfortable chairs, individually adjusted, and connected to a manipulandum of deXtreme's prototype robot. We situated the chair so that the computer monitor could be clearly observed by the subject. Each subject's affected extremity was harnessed to a handle connected to a robotic arm accompanying the movement. All subjects performed the reaching task with their affected arm.
    ARM 1: Kind: Experimental
    Label: Error Enhancement
    Description: Error Enhancement
  • Error Enhancement Device
    Other Names: Experimental: Error Enhancement of the Velocity Component
    Intervention Desc: 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.
    ARM 1: Kind: Experimental
    Label: Error Enhancement
    Description: Training of the upper extremity, using a robotic devise with error enhanced forces and traditional therapy.
  • Control treatment Device
    Intervention Desc: 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.
    ARM 1: Kind: Experimental
    Label: Control treatment
    Description: Training of the upper extremity, using a robotic devise without forces applied and traditional therapy.

Trial Design

  • Allocation: Randomized
  • Masking: Single Blind (Subject)
  • Purpose: Diagnostic
  • Endpoint: Safety/Efficacy Study
  • Intervention: Single Group Assignment

Outcomes

Type Measure Time Frame Safety Issue
Primary velocity error enhancement profile 3 weeks No
Secondary Error enhancement functions around its average values 3 weeks No
Primary Improvement in Average Movement Trajectory Error From T1 to T2 The outcome was assessed at the begining of the rehabilitation (T1) and about 5 weeks later at the end of rehabilitation (T2). No
Primary Fugl-Meyer Assessment Score The measured assessed at the begining of the rehabilitation (T1) and about 5 weeks later at the end of the rehabilitation (T2). No

Sponsors