Table 2.
Investigated parameters for quantification of bradykinesia, rigidity and tremor obtained by signals measured with the PowerGlove system.
| Task | Parameters |
|---|---|
| Bradykinesia | |
| Finger tapping index on thumb Hand opening/closing |
RMS of the acceleration of the index fingertip, over all cycles (norm of 3D) RMS of the angular velocity of the index fingertip, over all cycles (norm of 3D) Time of movement intervals (i.e. cycle time) using MCP angle, average and standard deviation of all cycles Minimum, maximum and ROM of the MCP angle of the index finger, average and standard deviation of all cycles (flexion angle) Minimum, maximum and ROM of the distance (i.e. amplitude) between index and thumb fingertips, average and standard deviation of all cycles (finger tapping) Minimum, maximum and ROM of the distance (i.e. amplitude) between index fingertip and hand, average and standard deviation of all cycles (hand open/close) |
| Pro/supination hand | RMS of acceleration of the hand, over all cycles (norm of 3D) RMS of angular velocity of the hand, over all cycles (norm of 3D) Time of movement intervals (i.e. cycle time) using the hand angle, average and standard deviation of all cycles Minimum, maximum and ROM of the hand angle, average and standard deviation of all cycles (angle with largest ROM) |
| Tremor | |
| During rest During mental task During postural task During kinetic task |
RMS of acceleration of the hand (around axis with highest acceleration) RMS of angular velocity of the hand (around axis with highest angular velocity) Peak power in de tremor band (4–10 Hz), using the acceleration of the hand Total power in the tremor bands (4–10 Hz), using the acceleration of the hand |
| Rigidity | |
| Wrist flexion/extension (passive) | Maximal ROM of wrist angle Torque at 20° and 50° wrist extension at wrist joint Maximal torque Stiffness of wrist joint (10–90% range of motion window) Impulse of wrist joint (10–90% time window) Work of wrist joint (10–90% range of motion window) |
RMS root means square, ROM range of motion, MCP metacarphophalangeal joint