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

Table 7 Tremor frequency and spectral power changes when altering visual input

Changes from Eyes Closed to Eyes Open
Recording method and site	DBS		Frequency increase [Hz]^a	Peak power decrease^a
Force platform	OFF		0.0 (0.1)	1.4 (0.6)
Force platform	ON		0.1 (−)	2.4 (−)
Body Movements	OFF	Head	0.1 (0.1)	1.8 (1.4)
		Shoulder	0.1 (0.1)	0.7 (0.2)
		Hip	0.3 (−)	0.7 (−)
		Knee	0.0 (0.0)	0.8 (0.6)
	ON	Head	−0.7 (0.7)	0.9 (0.1)
		Shoulder	0.1 (−)	2.4 (−)
		Hip	0.1 (−)	3.0 (−)
		Knee	0.1 (0.4)	2.0 (1.5)
Body Movements - Average all sites	DBS OFF		0.1 (0.1)	1.0 (0.8)
Body Movements - Average all sites	DBS ON		−0.1 (0.5)	2.1 (0.8)

^aMean (SEM) values are presented for tremor frequency increase (frequency _EC -frequency _EO) and peak power increase (power _EC/power _EO) for the different DBS states. In the cases no tremor peak was detected in one state, the frequency change was set to 0 and the power changes were calculated using the power at the frequency where the peak tremor was detected at in the other DBS state

ISSN: 1743-0003