Table 2.
Concentrations of O2Hb and HHb and gait performance measures during all three walking tasks
| 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) |
Values are mean (95 % confidence intervals)
*P < .05 compared to walking while counting
**P < .05 compared to both walking while talking and serially subtracting