The Effects of Instructions on Dual-Task Walking and Cognitive Task Performance in People with Parkinson's Disease

Table 2

Mean (SD) values for walking and the cognitive task values in all groups under single-task (ST) and both dual-task conditions.

	ST	DTwalk	DTcog
Gait speed (m/s)
HYA	1.86 (.21)	1.88 (.22)	1.80 (.23)
HOA	1.56 (.25)	1.58 (.25)	1.51 (.29)
PD	1.33 (.24)	1.28 (.22)	1.22 (.22)
Stride length (m)
HYA	1.68 (0.15)	1.68 (.15)	1.63 (.15)
HOA	1.43 (0.20)	1.40 (.21)	1.38 (.22)
PD	1.31 (0.20)	1.27 (.19)	1.24 (.20)
Cadence (steps/min)
HYA	134 (15)	135 (16)	132 (16)
HOA	131 (12)	135 (13)	132 (15)
PD	122 (15)	122 (16)	119 (14)
Step width (m)
HYA	0.14 (.02)	0.14 (.02)	0.14 (.02)
HOA	0.13 (.02)	0.14 (.03)	0.13 (.03)
PD	0.13 (.03)	0.13 (.04)	0.13 (.04)
Step width variability (%)
HYA	15.1 (5.2)	15.7 (6.0)	13.3 (4.5)
HOA	17.8 (4.9)	16.2 (3.8)	17.9 (4.4)
PD	16.2 (5.0)	14.8 (5.0)	16.3 (4.5)
Stride time variability (%)
HYA	2.3 (.7)	2.1 (.7)	2.0 (.5)
HOA	2.6 (1.2)	2.5 (.8)	2.3 (1.0)
PD	2.7 (1.0)	2.7 (1.0)	2.8 (1.4)
Inclination angle (degrees)
HYA	7.4 (.6)	7.4 (.7)	7.5 (.7)
HOA	7.6 (1.0)	7.6 (1.0)	7.5 (1.1)
PD	7.5 (.9)	7.6 (1.0)	7.5 (.9)
Response latency (s)
HYA	0.65 (.10)	0.82 (.12)	.66 (.10)
HOA	0.87 (.15)	0.90 (.15)	0.89 (.13)
PD	0.97 (.17)	1.08 (.24)	1.03 (.24)
Response accuracy (%)
HYA	99.2 (1.1)	98.8 (2.3)	99.7 (.9)
HOA	98.0 (3.9)	97.4 (5.5)	97.1 (5.7)
PD	90.3 (11.2)	89.9 (13.5)	92.9 (11.1)