Dynamic Variability of Isometric Action Tremor in Precision Pinching

Table 2

Means and standard deviations of tremor variables stratified by requisite task force level.

Task-relative force levels^b	Finger power^a		Total power^a		Concordance phase
	PD^c	OA^d	PD	OA	PD	OA
Low	52 (86)	24 (12)	229 (957)	48 (27)	130 (34)	152 (22)
Moderate	27 (30)*	21 (4)	96 (368)	41 (7)	136 (33)*	157 (19)
High	54 (198)	20 (3)	281 (1237)*	41 (7)	133 (36)	155 (19)

PD: Parkinson's disease participants.
OA: older well adults.
*Significant.
^aPower units are in mN²/sampling.
^bMagnitude of thumb and index finger force level required to move the cursor through each task segment.
^cTotal number of application and release task segments (PD group, 𝑛=396).
^dTotal number of application and release task segments (OA group, 𝑛=398).