Table 2 The cut-off thresholds of the dependent variables for the end-point kinematics
From: Changes in performance over time while learning to use a myoelectric prosthesis
Variables | Description | DG | IG |
|---|---|---|---|
Start reach | X-position and Z-position of the hand on the table | 90 < x-position hand < 150 mm | 500 < x-position hand > 600 mm & z-position hand < 90 mm |
| Â | The hand is closed at the start | Aperture hand < 30 mm | Aperture hand < 30 mm |
| Â | Velocity of the hand starts to increase | 10 < velocity hand < 50 mm/s | 10 < velocity hand < 50 mm/s |
End reach | The hand must be near the object | 390 < x-position hand < 500 mm | 0 < distance hand-object < 35 mm |
| Â | Velocity of the hand slows down | 0 < velocity hand < 10 mm/s | 0 < velocity hand < 20 mm/s |
| Â | Position of the object is not changed (only DG) | z-position object <87 mm | - |
Start grasp | Aperture of the hand starts to increase | 20 < aperture hand <50 mm | 20 < aperture hand < 50 mm |
| Â | Velocity of hand opening starts to increase | Velocity hand opening > 20 mm/s | Velocity hand opening > 20 mm/s |
End grasp | Aperture of the hand about size object | 65 < aperture hand < 95 mm | 65 < aperture hand < 95 mm |
| Â | Velocity of hand closing decreases to 0 | 0 < velocity hand closing < 15 mm/s | 0 < velocity hand closing <15 mm/s |
| Â | Grasp has ended as object starts to move (only DG) | 84 < z-position object < 100 mm | - |
| Â | The hand must be near the object | 390 < x-position hand < 500 mm | 0 < distance hand-object < 35 mm |
Start plateau | Aperture is around maximum | 90 < aperture hand < 150 mm | 80 < aperture hand < 140 |
| Â | Velocity of hand opening decreases to 0 | 0 < velocity hand opening < 20 mm/s | 0 < velocity hand opening < 20mm/s |
| Â | Position of object is not changed yet (only DG) | z-position object < 87 mm | - |
End plateau | Aperture is around maximum | 90 < aperture hand < 150 mm | 80 < aperture hand < 140 mm |
| Â | Velocity of hand closing starts to increase | 15 < velocity hand closing < 30 mm/s | 15 < velocity hand closing < 80 mm/s |
| Â | Position of object is not changed yet (only DG) | z-position object < 87 mm | - |