Table 3.

Executive Function as a Mediator of Walking Metrics During Single- and Dual-Task Walking by LOW Versus HIGH NVC

	LOW NVC	HIGH NVC	β	CI	P
Gait speed
Single (m/s)	0.93 ± 0.05	1.04 ± 0.04	0.19	−0.003, 0.109	.06†
Dual-task (m/s)	0.73 ± 0.05	0.79 ± 0.04	0.13	−0.024, 0.088	.26†
Step width
Single (m)	0.56 ± 0.02	0.60 ± 0.02	0.19	−0.002, 0.044	.08†
Dual-task (m)	0.51 ± 0.02	0.55 ± 0.02	0.17	−0.005, 0.041	.13†
Stride length
Single (m)	1.07 ± 0.04	1.16 ± 0.04	0.20	−0.003, 0.094	.07†
Dual-task (m)	0.97 ± 0.04	1.05 ± 0.04	0.18	−0.010, 0.089	.11†
Double-support time
Single (%)	37.5 ± 1.5	34.3 ± 1.3	−0.21	−3.303, 0.104	.07
Dual-task (%)	40.7 ± 1.5	36.3 ± 1.3	−0.29	−3.893, −0.567	.01*

Notes: CI = confidence interval (lower, upper); NVC = neurovascular coupling. Data are presented as least square mean ± SE.

*p < .05: Model 2 = Model 1 + Trails B performance. ^†10% change in the estimate with the inclusion of Trails B as a mediator.