Measuring prefrontal cortical activity during dual task walking in patients with Parkinson’s disease: feasibility of using a new portable fNIRS device

Table 3 Effect sizes (Cohen’s d_z) between the walking tasks for both concentrations of O2Hb and HHb and gait performance

	Walking while serially subtracting > counting	Walking while reciting digit spans > counting	Walking while serially subtracting > reciting digit spans
fNIRS
O₂Hb left	.29	.08	.36
O₂Hb right	.31	.20	.27
HHb left	−.13	−.36	.43
HHb right	−.07	−.18	.42
Gait performance
Gait speed (m/s)	−.22	−.72	.40
Cadence (steps/min)	−.33	−.15	−.23
Stride length (m)	−.09	−.93	.73
Stride length variability (%)	.11	1.04	−.32
Stride time (s)	.30	.16	.18
Stride time variability (%)	−.05	−.20	.24

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