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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 characteristicsPD tremor
Recording methodDBS StateVisionBody SitePeak Frequency (Hz)Powera(10−3)
Force platform (Nm)OFFClosedb4.6 (0.2)467.4 (434.8)
Open4.7 (0.1)408.3 (245.2)
ONClosed5.0 (−)152.4 (−)
Open4.9 (−)63.8 (−)
    Peak Frequency (Hz)Powera(10−6)
Body Movements (mm)OFFClosedbHead4.7 (0.2)396.2 (72.8)
Shoulder4.9 (0.1)5858.5 (2372.8)
Hip5.0 (−)278.1 (−)
Knee4.9 (−)7916.5 (−)
OpenHead4.6 (0.1)4676.6 (2351.2)
Shoulder4.7 (0.1)22,916.7 (19,768.4)
Hip4.7 (0.1)15,192.9 (12,276.1)
Knee5.7 (0.8)11,758.8 (8975.5)
ONClosedHead
Shoulder5.0 (−)1922.6 (−)
Hip5.0 (−)745.0 (−)
Knee5.1 (0.2)2025.9 (1750.8)
OpenHead5.6 (0.7)612.1 (163.0)
Shoulder5.6 (0.7)605.1 (204.1)
Hip4.9 (−)248.9 (−)
Knee5.0 (0.6)797.4 (278.2)
Body Movements - Average all sitesOFFClosed4.9 (0.1)3612.3 (122.8)
Open4.9 (0.1)13,636.7 (16,622.8)
ONClosed5.0 (0.1)1173.3 (875.4)
Open5.3 (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