TABLE 2.
Distribution of real-world gait digital mobility outcomes (DMOs) in 549 people with COPD
| Definition | Mean±sd | Minimum–maximum | |
|---|---|---|---|
| Gait pace | |||
| Walking speed in shorter (10–30 s) WBs (m·s−1) | The distance covered by the whole body per second, assessed in WBs between 10 and 30 s | 0.67±0.07 | 0.46–0.88 |
| Walking speed in longer (>30 s) WBs (m·s−1) | The distance covered by the whole body per second, assessed in WBs longer than 30 s | 0.83±0.12 | 0.48–1.20 |
| Maximum walking speed in WBs >10 s (m·s−1) | The maximum (P90) distance covered by the whole body per second, assessed in WBs of more than 10 s | 0.90±0.13 | 0.55–1.27 |
| Maximum walking speed in longer (>30 s) WBs (m·s−1) | The maximum (P90) distance covered by the whole body per second, assessed in WBs of more than 30 s | 0.99±0.18 | 0.54–1.47 |
| Stride length in shorter (10–30 s) WBs (cm) | Length of two consecutive steps, assessed during WBs between 10 and 30 s | 91±9 | 60–117 |
| Stride length in longer (>30 s) WBs (cm) | Length of two consecutive steps, assessed during WBs longer than 30 s | 106±12 | 68–146 |
| Gait rhythm | |||
| Cadence in all WBs (steps·min−1) | Step frequency during a period of time (mins), calculated in all WBs | 85±4 | 74–97 |
| Cadence in longer (>30 s) WBs (steps·min−1) | Step frequency during a period of time (mins), calculated in WBs longer than 30 s | 91±7 | 70–111 |
| Maximum cadence in longer (>30 s) WBs (steps·min−1) | Maximum (P90) step frequency during a period of time (mins), calculated using WBs longer than 30 s | 100±9 | 73–124 |
| Stride duration in all WBs (s) | Time elapsed between the initial contacts of two consecutive footfalls of the same foot, assessed in all walking WBs | 1.30±0.06 | 1.06–1.49 |
| Stride duration in longer (>30 s) WBs (s) | Time elapsed between the initial contacts of two consecutive footfalls of the same foot, assessed in WBs longer than 30 s | 1.26±0.09 | 0.95–1.57 |
| Gait bout-to-bout variability | |||
| Walking speed bout-to-bout variability in longer (>30 s) WBs (%) | Bout-to-bout variability of walking speed, assessed in WBs of more than 30 s | 17±5 | 2–37 |
| Stride length bout-to-bout variability between longer (>30 s) WBs (%) | Bout-to-bout variability of stride length, assessed in WBs of more than 30 s | 12±4 | 2–27 |
| Cadence bout-to-bout variability (%) | Bout-to-bout variability of cadence, assessed in all WBs | 12±1 | 8–17 |
| Stride duration bout-to-bout variability (%) | Bout-to-bout variability of stride duration, assessed in WBs | 14±2 | 9–26 |
Based on Kluge et al. [24], a walking bout (WB) is a walking sequence containing at least two consecutive strides of both feet (e.g. R-L-R-L-R-L or L-R-L-R-L-R). Some variables had missing values: 4 in walking speed bout-to-bout variability in longer (>30 s) WBs, stride length bout-to-bout variability between longer (>30 s) WBs. P90: 90th percentile.