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Table 2 Concentrations of O2Hb and HHb and gait performance measures during all three walking tasks

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

  Walking while counting Walking while serially subtracting Walking while reciting digit spans
fNIRS
 O2Hb left (μmol/L) 0.32 (−0.18–0.82) 0.49 (0.14–0.84) 0.44 (0.09–0.78)
 O2Hb right (μmol/L) 0.31 (−0.12–0.75) 0.46 (0.12–0.81) 0.36 (0.03–0.70)
 HHb left (μmol/L) 0.03 (−0.28–0.33) 0.01 (−0.15–0.17) −0.03 (−0.16–0.10)
 HHb right (μmol/L) 0.00 (−0.28–0.28) −0.02 (−0.25–0.21) −0.10 (−0.24–0.05)
Gait performance
 Gait speed (cm/s) 83.7 (73.7–93.7) 82.3 (71.8–92.9) 79.9 (68.2–91.6)
 Cadence (steps/min) 94.6 (86.2–103) 93.2 (84.6–101.9) 94.0 (84.0–104.0)
 Stride length (cm) 106.3 (97.7–114.9) 106 (96.6–115.4) 101.2 (91.5–111.0)**
 Stride length variability (%) 4.2 (3.2–5.2) 4.5 (2.9–6.2) 5.4 (4.4–6.5)*
 Stride time (s) 1.3 (1.2–1.4) 1.3 (1.2–1.4) 1.3 (1.2–1.5)
 Stride time variability (%) 4.2 (2.4–5.9) 4.0 (2.9–5.2) 3.6 (2.7–4.6)
  1. Values are mean (95 % confidence intervals)
  2. *P < .05 compared to walking while counting
  3. **P < .05 compared to both walking while talking and serially subtracting