TABLE 2.

Summary of regression analyses predicting executive function performance.

	R 2	ΔR2	ΔF		R 2	ΔR2	ΔF
Global switching cost				Interference cost
Model 1	0.014	0.014	0.401	Model 1	0.079	0.079	2.456
Model 2 (GXT)	0.129	0.115	7.425*	Model 2 (GXT)	0.170	0.091	6.108*
Model 1	0.014	0.014	0.401	Model 1	0.079	0.079	2.456
Model 2 (ROCK)	0.164	0.150	10.048*	Model 2 (ROCK)	0.158	0.079	5.240*
Model 1	0.014	0.014	0.401	Model 1	0.079	0.079	2.456
Model 2 (EQUA)	0.040	0.026	1.500	Model 2 (EQUA)	0.179	0.100	6.822*
Local switching cost				Updating cost
Model 1	0.001	0.001	0.033	Model 1	0.015	0.015	0.434
Model 2 (GXT)	0.002	0.000	0.022	Model 2 (GXT)	0.019	0.004	0.197
Model 1	0.001	0.001	0.033	Model 1	0.015	0.015	0.434
Model 2 (ROCK)	0.020	0.019	1.079	Model 2 (ROCK)	0.025	0.010	0.548
Model 1	0.001	0.001	0.033	Model 1	0.015	0.015	0.434
Model 2 (EQUA)	0.003	0.001	0.084	Model 2 (EQUA)	0.032	0.016	0.930

Model 1, Age and education; Model 2, Age and education and cardiorespiratory fitness estimate.

*p < 0.05.

GXT, Maximal graded exercise test; EQUA, Non-exercise prediction equation; ROCK, Rockport Fitness Walking Test.