Table 2.

Effect of Time and Subjective Fatigue on HbO₂ Levels During NW and WWT

	Estimate	t	95% CI	p
(A) HbO2 levels during NW
Walk 1 vs Walk 2	0.151	2.95	0.050 to 0.252	<.01
Walk 1 vs Walk 3	0.081	1.58	−0.019 to 0.182	.114
Walk 1 vs Walk 4	0.064	1.25	−0.036 to 0.164	.210
Walk 1 vs Walk 5	−0.038	−0.75	−0.139 to 0.062	.452
Walk 1 vs Walk 6	−0.091	−1.78	−0.193 to 0.009	.074
Subjective fatigue	−0.064	−0.55	−0.296 to 0.166	.582
Subjective fatigue × Walk 1 vs Walk 2	−0.004	−0.01	−0.144 to 0.143	.995
Subjective fatigue × Walk 1 vs Walk 3	−0.003	−0.05	−0.147 to 0.140	.964
Subjective fatigue × Walk 1 vs Walk 4	−0.049	−0.68	−0.194 to 0.094	.496
Subjective fatigue × Walk 1 vs Walk 5	−0.070	−0.96	−0.215 to 0.073	.335
Subjective fatigue × Walk 1 vs Walk 6	−0.095	−1.29	−0.240 to 0.049	.195
(B) HbO2 levels during WWT
Walk 1 vs Walk 2	0.356	6.04	0.240 to 0.472	<.0001
Walk 1 vs Walk 3	0.506	8.59	0.390 to 0.622	<.0001
Walk 1 vs Walk 4	0.588	9.98	0.472 to 0.704	<.0001
Walk 1 vs Walk 5	0.615	10.39	0.499 to 0.731	<.0001
Walk 1 vs Walk 6	0.584	9.87	0.468 to 0.700	<.0001
Subjective fatigue	−0.004	−0.03	−0.274 to 0.265	.973
Subjective fatigue × Walk 1 vs Walk 2	−0.037	−0.45	−0.203 to 0.127	.652
Subjective fatigue × Walk 1 vs Walk 3	−0.137	−1.63	−0.302 to 0.027	.103
Subjective fatigue × Walk 1 vs Walk 4	−0.178	−2.12	−0.344 to −0.013	.033
Subjective fatigue × Walk 1 vs Walk 5	−0.230	−2.73	−0.396 to −0.064	.0065
Subjective fatigue × Walk 1 vs Walk 6	−0.231	−2.74	−0.397 to −0.065	.0062

Note: NW = normal-walk; WWT = walk-while-talk.