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Table 8 Tremor frequencies and peak spectral power amplitudes for PD tremor

From: Exploring the effects of deep brain stimulation and vision on tremor in Parkinson’s disease - benefits from objective methods

Tremor characteristics

PD tremor

Recording method

DBS State

Vision

Body Site

Peak Frequency (Hz)

Powera(10−3)

Force platform (Nm)

OFF

Closedb

4.6 (0.2)

467.4 (434.8)

Open

4.7 (0.1)

408.3 (245.2)

ON

Closed

5.0 (−)

152.4 (−)

Open

4.9 (−)

63.8 (−)

    

Peak Frequency (Hz)

Powera(10−6)

Body Movements (mm)

OFF

Closedb

Head

4.7 (0.2)

396.2 (72.8)

Shoulder

4.9 (0.1)

5858.5 (2372.8)

Hip

5.0 (−)

278.1 (−)

Knee

4.9 (−)

7916.5 (−)

Open

Head

4.6 (0.1)

4676.6 (2351.2)

Shoulder

4.7 (0.1)

22,916.7 (19,768.4)

Hip

4.7 (0.1)

15,192.9 (12,276.1)

Knee

5.7 (0.8)

11,758.8 (8975.5)

ON

Closed

Head

Shoulder

5.0 (−)

1922.6 (−)

Hip

5.0 (−)

745.0 (−)

Knee

5.1 (0.2)

2025.9 (1750.8)

Open

Head

5.6 (0.7)

612.1 (163.0)

Shoulder

5.6 (0.7)

605.1 (204.1)

Hip

4.9 (−)

248.9 (−)

Knee

5.0 (0.6)

797.4 (278.2)

Body Movements - Average all sites

OFF

Closed

4.9 (0.1)

3612.3 (122.8)

Open

4.9 (0.1)

13,636.7 (16,622.8)

ON

Closed

5.0 (0.1)

1173.3 (875.4)

Open

5.3 (0.7)

565.9 (215.1)

  1. aThe force platform FFT analysis was performed on raw data (recorded torque reflecting COP position) normalized with the patient’s weight and height with the unit and scale after normalization of [(N m Kg−1 m−1) 100]. The 3D motion capture FFT analysis was performed on raw data (position) normalized with the patient’s height with the unit and scale after normalization of [m 10−3 m− 1]
  2. bThe three patients with the poorest stability, including two patients that were among those with the strongest recorded tremors under the other test conditions, could not perform this test entirely