Effects of Gait and Cognitive Task Difficulty on Cognitive-Motor Interference in Aging

Table 3

Adjusted means (95% confidence intervals) for dual-task effects on reaction time (DTErt) and accuracy (DTEacc) for each cognitive task as a function of gait task. Positive values indicate a dual-task benefit relative to single-task; negative values indicate a dual-task cost relative to single-task performance. None of the main effects or interactions in the ANCOVA were significant for DTErt or DTEacc.

	DTErt (%)			DTEacc (%)
	Self-selected	Fast comfortable	Fast obstacle	Self-selected	Fast comfortable	Fast obstacle
Stroop
Young	−7.6 (−14.8, −0.4)	−0.5 (−8.1, 7.2)	−1.0 (−8.7, 6.6)	−0.1 (−6.0, 5.7)	−0.7 (−5.9, 4.6)	−0.5 (−5.4, 4.4)
Older	−3.7 (−12.4, 5.0)	−5.2 (−14.5, 4.0)	−4.2 (−13.4, 5.1)	−0.4 (−7.4, 6.7)	−1.2 (−7.5, 5.2)	0.2 (−5.6, 6.1)
Clock
Young	4.7 (−3.0, 12.5)	18.4 (11.2, 25.7)	11.3 (3.8, 18.7)	−1.6 (−9.7, 6.6)	0.4 (−10.7, 11.5)	−1.8 (−9.4, 5.8)
Older	14.5 (5.1, 23.9)	14.7 (5.9, 23.5)	12.9 (3.8, 21.9)	−4.6 (−14.4, 5.3)	−2.4 (−15.9, 11.0)	−11.3 (−20.6, −2.1)